Electrical machine laboratory

Electric Machines » Electrical machine laboratory

The electrical machine laboratory is a fundamental subject for all electrical engineering students and for this reason recently De Lorenzo has decided to upgrade the old laboratory equipment and to provide students with hands-on application on up-to-date electric machines, drives and instruments, as well as to improve their preparation theory learned from lectures. The benches are designed to study all types of electric machines such as three-phase asynchronous and synchronous machines, single-phase machines, direct current machines, single-phase and three-phase transformers, speed control of DC and AC motors and a bench that allows to learn the PLC programming techniques to be able to control an electrical machine driven by an inverter. Both the powers 0.3 kW (Eurolab) and 1.1 kW (Unilab) are covered by all the previous benches and their characteristic key is the total modularity and the advantage to include digital measuring units with software to acquire and process data through Modbus interface. They are recommended for high schools and first years of university.

Products Details

BENCH FOR THE STUDY OF THREE‐PHASE ASYNCHRONOUS MOTORS

The DL MAC‐AT is a multipurpose bench for the study and characterization of three‐phase asynchronous motors of the Eurolab series EM (0.3 kW) and Unilab series UM (1.1 kW).
The asynchronous motor represents the most important and simple case in the area of polyphase machines and it is the most widespread for industrial applications as food, chemical, metallurgical industries, paper factories or water treatment and extractive systems.
The De Lorenzo’s electric machines bench has been designed to satisfy the following basic requirements:
• The number of groups of students who must work simultaneously
• The available space of the working area
• The plan activities  
• The economic advantage
The characteristic key of this bench is its total modularity which means:
• to couple each motor with the electromagnetic brake
• to be able to buy the bare essentials
• to configure complete solutions without creating duplication of equipment
The didactic advantage is to be able to investigate the behavior of each electric machine making part of this bench that assumes the following configuration:
• autonomous basic bench, with universal power supply able to provide all the voltages, fixed and variable AC and DC and stabilized and digital measurement units in order to perform a complete course of  measurements on electric machines
• universal base, to secure the machines which can be mounted directly on the bench in front of the main power supply and the instrumentation assembled on the frame
• series of motors, brake, tools and various accessories to be able to make any test on the electric machines
All machines are built for continuous operation and withstand an overload of about 20÷30% even for long duration.
Moreover, the  motors and the electromagnetic brake are built with great care and they have such low losses that could be classified as real text machines.
Each electric machine is equipped with an exhaustive instruction manual that explains all of the tests that can be performed on that machine. Thus, our manual can be considered a theoretical and practical "textbook".
Ultimately this bench allows measuring, through direct methods, the mechanical characteristics (torque as a function of the speed) and the electro‐mechanical characteristics (torque, speed, input current, efficiency and power factor as a function of the output power).
The bench also includes digital measurement modules with the possibility to acquire data through MODBUS interface and the use of a processing and acquisition software.

DL MAC‐AT_EM
DL MAC‐AT_UM

BENCH FOR THE STUDY OF THREE-PHASE SYNCHRONOUS MACHINES

The DL MAC-ST is a multipurpose bench for the study and characterization of three-phase synchronous machines of the Eurolab series EM (0.3 kW) and Unilab series UM (1.1 kW).
Among three-phase power supply the synchronous machines are widely used and they called so because the speed of the rotor of these machines are the same as the rotating magnetic field.
Their construction is almost similar to that a three-phase induction motor except the fact that the rotor is given DC supply. They are commonly used as generators especially for large power systems, such as turbine and hydroelectric generators in the grid power supply.
Because the rotor speed is proportional to the frequency of excitation, synchronous motors can be used in situations where constant speed drive is required.
Since the reactive power generated by a synchronous machine can be adjusted by controlling the magnitude of the rotor field current, unloaded synchronous machines are also often installed in power systems solely for power factor correction or for control of reactive kVA flow.
The De Lorenzo’s electric machines bench has been designed to satisfy the following basic requirements:
• The number of groups of students who must work simultaneously
• The available space of the working area
• The plan activities
• The economic advantage
The characteristic key of this bench is its total modularity which means:
• to couple each drive mover with the synchronous machine
• to be able to buy the bare essentials
• to configure complete solutions without creating duplication of equipment
The didactic advantage is to be able to investigate the behavior of each electric machine making part of this bench that assumes the following configuration:
• autonomous basic bench, with universal power supplies able to provide the fixed stabilized three-phase and DC voltages and digital measurement units in order to perform a complete course of measurements on electric machines
• universal base, to secure the machines which can be mounted directly on the bench in front of the main power supply and the instrumentation assembled on the frame
• series of motors, tools and various accessories to be able to make any test on the electric machines
All machines are built for continuous operation and withstand an overload of about 20÷30% even for long duration.
Moreover, the machines are built with great care and they have such low losses that could be classified as real text machines.
Each electric machine is equipped with an exhaustive instruction manual that explains all of the tests that can be performed on that machine.
Thus, our manual can be considered a theoretical and practical "textbook".
Ultimately this bench allows measuring, through direct methods, the mechanical characteristics (torque as a function of the speed) and the electro-mechanical characteristics (torque, speed, input current, efficiency and power factor as a function of the output power).
The bench also includes digital measurement modules with the possibility to acquire data through MODBUS interface and the use of a processing and acquisition software.

DL MAC-ST_EM
DL MAC-ST_UM

BENCH FOR THE STUDY OF SINGLE‐PHASE MOTORS

The DL MAC‐SP is a multipurpose bench for the study and characterization of single‐phase motors of the Eurolab series EM (0.3 kW) and Unilab series UM (1.1 kW).
Single‐phase motors, although less used in the industry than the three‐phase motors, represent a not significant part in low‐power applications that use the single‐phase network.
At the same power, they are more bulky than three‐phase motors and their performance and cosϕ are much lower but are simple in construction, cheap in cost, reliable and easy to repair and maintain.
Rarely used in the industry, the single‐phase universal motor is the motor that is most manufactured in the world, popular in the field of home appliances and in that of portable equipment.
The De Lorenzo’s electric machines bench has been designed to satisfy the following basic requirements:
• The number of groups of students who must work simultaneously
• The available space of the working area
• The plan activities  
• The economic advantage
The characteristic key of this bench is its total modularity which means:
• to couple each motor with the electromagnetic brake
• to be able to buy the bare essentials
• to configure complete solutions without creating duplication of equipment
The didactic advantage is to be able to investigate the behavior of each electric machine making part of this bench that assumes the following configuration:
• autonomous basic bench, with universal power supply able to provide all the voltages, fixed and variable AC and DC and stabilized and digital measurement units in order to perform a complete course of  measurements on electric machines
• universal base, to secure the machines which can be mounted directly on the bench in front of the main power supply and the instrumentation assembled on the frame
• series of motors, brake, tools and various accessories to be able to make any test on the electric machines
All machines are built for continuous operation and withstand an overload of about 20÷30% even for long duration.
Moreover, the  motors and the electromagnetic brake are built with great care and they have such low losses that could be classified as real text machines.
Each electric machine is equipped with an exhaustive instruction manual that explains all of the tests that can be performed on that machine.
Thus, our manual can be considered a theoretical and practical "textbook".
Ultimately this bench allows measuring, through direct methods, the mechanical characteristics (torque as a function of the speed) and the electro‐mechanical characteristics (torque, speed, input current, efficiency and power factor as a function of the output power).
The bench also includes digital measurement modules with the possibility to acquire data through MODBUS interface and the use of a processing and acquisition software.  

DL MAC‐SP_EM
DL MAC‐SP_UM

BENCH FOR THE STUDY OF DIRECT CURRENT MACHINES

The DL MAC‐DC is a multipurpose bench for the study and characterization of direct current machines (motors and generators) of the Eurolab series EM (0.3 kW) and Unilab series UM (1.1 kW).
The DC machines are driven from a DC power supply and they are the most versatile of all rotating electrical machines.
Their speed can be easily adjusted in very fine increments ranging from standstill to rated speed and even above and their construction is made rather complex than their AC counterparts by the fact that they need a commutator, which reverses the direction of current and fluxes to produce a net torque.
All the DC machines have a reversible behavior: they are motors up to a frequency that is characteristic of the construction parameters and is said synchronism frequency, beyond which they behave as generators (dynamo).
The DC motors are used in a wide variety of industrial drives, such as robots, machine tools, oil drilling rigs, mining, automotive systems, etc.  
On the other hand, DC generators are still in use in some power generating plants.
The real difference between DC motor and DC generator is the direction of power flow.
The De Lorenzo’s electric machines bench has been designed to satisfy the following basic requirements:
• The number of groups of students who must work simultaneously
• The available space of the working area
• The plan activities
  • The economic advantage
The characteristic key of this bench is its total modularity which means:
• to couple each motor with the electromagnetic brake
• to couple each generator with the prime mover
• to be able to buy the bare essentials
• to configure complete solutions without creating duplication of equipment
The didactic advantage is to be able to investigate the behavior of each electric machine making part of this bench that assumes the following configuration:
• autonomous basic bench, with universal power supply able to provide all the voltages, fixed and variable DC and stabilized and digital measurement units in order to perform a complete course of  measurements on electric machines
• universal base, to secure the machines which can be mounted directly on the bench in front of the main power supply and the instrumentation assembled on the frame • series of motors, generators, brake, tools and various accessories to be able to make any test on the electric machines
All machines are built for continuous operation and withstand an overload of about 20÷30% even for long duration.
Moreover, the  machines and the electromagnetic brake are built with great care and they have such low losses that could be classified as real text machines.
Each electric machine is equipped with an exhaustive instruction manual that explains all of the tests that can be performed on that machine.
Thus, our manual can be considered a theoretical and practical "textbook".
Ultimately this bench allows measuring, through direct methods, the mechanical characteristics (torque as a function of the speed) and the electro‐mechanical characteristics (torque, speed, input current, efficiency as a function of the output power).
The bench also includes digital measurement modules with the possibility to acquire data through MODBUS interface and the use of a processing and acquisition software.

DL MAC‐DC_EM
DL MAC‐DC_UM

BENCH FOR THE STUDY OF SINGLE‐PHASE AND THREE‐PHASE TRANSFORMERS

The DL MAC‐TT is a multipurpose bench for the study and characterization of single‐phase and three‐phase transformers of the Eurolab series EM (0.3 kW) and Unilab series UM (1.1 kW).
The transformer is a static and reversible device which transforms the electrical energy from one circuit to another, without any direct electrical connection between two windings and without changing its frequency, with the help of an electromagnetic (mutual) induction. 
  Single‐phase transformers are more popular than three‐phase transformers in non‐urban areas and are frequently used for power distribution and voltage reduction for residential and commercial applications.
Three‐phase transformers are employed typically by electric power distribution grids to power large motors and large loads.
Their main parameters are: operating frequency range, primary and secondary voltage ratings, secondary current rating, operating temperature and power rating (VA).   
  The De Lorenzo’s electric machines bench has been designed to satisfy the following basic requirements:
• The number of groups of students who must work simultaneously
• The available space of the working area
• The plan activities  
• The economic advantage
The characteristic key of this bench is its total modularity which means:
• to wire each transformer with the power supply, the power meters and the loads
• to be able to buy the bare essentials
• to configure complete solutions without creating duplication of equipment
The didactic advantage is to be able to investigate the behavior of each single‐phase and three‐ phase transformer making part of this bench that assumes the following configuration:
• autonomous basic bench, with universal power supply able to provide all the voltages, fixed and variable AC and digital measurement units in order to perform a complete course of  measurements on them
• can be mounted directly on the bench in front of the main power supply with the instrumentation assembled on the frame
All transformers are built for continuous operation and withstand an overload of about 20÷30% even for long duration.
Moreover, they are built with great care and they have such low losses that could be classified as real text static machines.
Each transformer is equipped with an exhaustive instruction manual that explains all of the tests that can be performed on it.
Thus, our manual can be considered a theoretical and practical "textbook".
Ultimately this bench allows measuring, through direct methods, the winding resistance, the transformation ratio, the no‐load/short‐circuit/load characteristics, the determination of the polarities and the connection group.
The bench also includes digital measurement modules with the possibility to acquire data through MODBUS interface and the use of a processing and acquisition software.

DL MAC‐TT_EM
DL MAC‐TT_UM

BENCH FOR THE STUDY OF SPEED CONTROL OF DC MOTORS

The DL MAC‐CCC is a multipurpose bench for the speed control of direct current motors of EUROLAB (0.3 kW) and UNILAB (1.1 kW) electric machines.
The DC motors are used in a wide variety of industrial drives, such as robots, machine tools, oil drilling rigs, mining, automotive systems, etc.
Their speed can be easily adjusted in very fine increments ranging from standstill to rated speed and even above and their construction is made rather complex than their AC counterparts by the fact that they need a commutator, which reverses the direction of current and fluxes to produce a net torque.
The DC motor speed controller is built with a single phase semi‐controlled thyristor bridge suitable for the control of the speed of independently excited DC motors by regulating the conduction period in open and closed loop.  
The controller consists of three control loops: speed, current and armature voltage (for this latter it is necessary to use the isolation amplifier).
The De Lorenzo’s electric machines bench has been designed to satisfy the following basic requirements:
• The number of groups of students who must work simultaneously
• The available space of the working area
• The plan activities  
• The economic advantage
The characteristic key of this bench is its total modularity which means:
• to couple the DC motor with the electromagnetic brake
• to be able to buy the bare essentials
• to configure complete solutions without creating duplication of equipment
The didactic advantage is to be able to investigate the behavior of each module making part of this bench that assumes the following configuration:
• autonomous basic bench able to perform a complete course of speed control on DC motors
• universal base, to secure the machines which can be mounted directly on the bench in front of the DC motor speed controller  
• tools and various accessories to be able to make any test on this bench
All machines are built for continuous operation and withstand an overload of about 20÷30% even for long duration.
Moreover, the DC motor and the electromagnetic brake are built with great care and they have such low losses that could be classified as real text machines.
This bench is supplied with an exhaustive instruction manual that explains all of the tests that can be performed on it. Thus, our manual can be considered a theoretical and practical "textbook".
EXPERIMENTS
The experiments that can be performed are:
• Rotor voltage regulator
• Tachometer regulation
• Meaning of gain
• Resistive load (in thyristor bridge)
• Step response of the current regulation
• Step response of the speed regulation
• The operational amplifier (and transfer function)
• Bode diagram for the current and speed regulations

DL MAC‐CCC_E
DL MAC‐CCC_U

BENCH FOR THE STUDY OF SPEED CONTROL OF AC MOTORS

The DL MAC-CCA is a multipurpose bench for the speed control of three-phase asynchronous motors of EUROLAB (0.3 kW) and UNILAB (1.1 kW) electric machines.
The asynchronous motor represents the most important and simple case in the area of polyphase machines and it is the most widespread for industrial applications as food, chemical, metallurgical industries, paper factories or water treatment and extractive systems.
There are several ways to control the speed of an induction motor and the best way would be to have a variable frequency AC drive.
The speed will be a little slower than the applied frequency but fairly close and to obtain an exact speed a feedback loop is provided with the bench to measure the rotating frequency and to adjust the variable frequency AC drive maintaining that speed as the motor speed will decrease a bit due to an electromagnetic brake acting as a load. The speed control can be achieved also through a manual control of a potentiometer with or without acceleration and deceleration ramps.
The variable frequency AC drive can be programmed from keyboard with on screen guide.
The De Lorenzo’s electric machines bench has been designed to satisfy the following basic requirements:
• The number of groups of students who must work simultaneously
• The available space of the working area
• The plan activities
• The economic advantage
The characteristic key of this bench is its total modularity which means:
• to couple the induction motor with the electromagnetic brake
• to be able to buy the bare essentials
• to configure complete solutions without creating duplication of equipment
The didactic advantage is to be able to investigate the behavior of each module making part of this bench that assumes the following configuration:
• autonomous basic bench able to perform a complete course of speed control on AC induction electric machines
• universal base, to secure the machines which can be mounted directly on the bench in front of the variable frequency AC drive
• tools and various accessories to be able to make any test on this bench
All machines are built for continuous operation and withstand an overload of about 20÷30% even for long duration.
Moreover, the induction motor and the electromagnetic brake are built with great care and they have such low losses that could be classified as real text machines.
This bench is supplied with an exhaustive instruction manual that explains all of the tests that can be performed on it. Thus, our manual can be considered a theoretical and practical "textbook".
EXPERIMENTS
The experiments that can be performed are:
• Motor parameter setting / Autotunig
• Open loop speed regulation
• Jog speed
• Multistep control
• Motor power curve
• Motor torque-speed curve
• Closed loop speed regulation  

DL MAC-CCA_E
DL MAC-CCA_U

BENCH FOR THE STUDY OF THE MOTOR AUTOMATION

The DL MA‐PLC is a multipurpose bench that allows to learn the PLC programming techniques in order to control an electrical machine driven by an inverter.
It is composed of a three‐phase asynchronous motor, a three‐phase alternator, a PLC, an inverter, a resistive load, a power supply and modules for measuring the electrical and the mechanical powers.
The PLCs are the control devices used in automation systems with dedicated software so that they are capable of being programmed to perform corresponding control operations and they are widely used in industrial control and can operate at industry environment conditions. 
   The PLC monitors the motors operation and correlates the parameters according to the developed software.
The performance of the induction asynchronous motor can be tested in two different modes:
• fed by the inverter and PLC (with high accuracy in speed regulation and load operation)
• or fed by the inverter only
The De Lorenzo’s electric machines  bench (with the help of a PLC) has been designed to satisfy the following basic requirements:
• The number of groups of students who must work simultaneously
• The available space of the working area
• The plan activities 
  • The economic advantage
The characteristic key of this bench is its total modularity which means:
• to couple machines (motor and alternator) with the modules fixed on the frame (Inverter, PLC, instruments, etc.)  
• to be able to buy the bare essentials
• to configure complete solutions without creating duplication of equipment
The didactic advantage is to be able to investigate the behavior of each module making part of this bench that assumes the following configuration:
• autonomous basic bench, with inverter and DC power supply able to provide the necessary voltages and digital measurement units in order to perform a complete course of   measurements on all modules making part of this bench
• universal base, to secure the machines which can be mounted directly on the bench in front of the modules and the instrumentation assembled on the frame
• tools and various accessories to be able to make any test on this bench
The machines are built for continuous operation and withstand an overload of about 20÷30% even for long duration.
Moreover, the  machines are built with great care and they have such low losses that could be classified as real text machines.
The bench is equipped with an exhaustive instruction manual and thus it can be considered a theoretical and practical "textbook".
Ultimately this bench allows measuring, through direct methods, the mechanical characteristics (torque and speed) and the electro‐mechanical characteristics (torque, speed, input current, efficiency and power factor as a function of the output power).
The bench also includes digital measurement modules with the possibility to acquire data through MODBUS interface and the use of a processing and acquisition software.
EXPERIMENTS
The experiments that can be performed are:
• Study and parametrization of a three‐phase inverter
• Study and configuration (HW/SW) of a PLC
• Starting of an electrical machine fed by a three‐phase inverter
• Starting of an electrical machine fed by a three‐phase inverter and a PLC
• Study and analysis of the mechanical power
• Study of a three‐phase synchronous generator 

DL MA‐PLC

SINGLE-PHASE TRANSFORMER TRAINER

Introduction Technical characteristics
The trainer provides an experimental approach to the analysis of the behavior and characteristics of the single-phase transformer.
Its operating features are deduced from typical industrial grade tests This trainer is composed by:
• Two single phase transformer with the
following characteristics:
Transformer 1
Primary voltage: 24-42-48 V
Secondary voltage: 2 x 12 V
Rated power: 50 VA
Transformer 2
Primary voltage: 24-42-48 V
Secondary voltage: 2 x 12 V
Rated power: 100 VA
Learning experience
Together with this transformer trainer is provided a complete manual with theoretical and practical part to allow the student to have complete knowledge of what is a transformer and how to use it.  
List of experiments:
1. Voltage transformation ratio
2. Current transformation ratio
3. Polarity of the windings
4. Measuring the winding resistances
5. No-load test
6. Short-circuit test
7. Test under resistive or capacitive load
8. Measuring the efficiency with the direct method
9. Heating test
10. The magnetic field
Displaying the hysteresis cycle
• Module allowing to obtain a low-voltage variable supply, to perform current, voltage and power measurements and to realize resistive and capacitive loads.
Technical features:
2 ac outputs: 0÷48V, 5A / 0÷10V, 10A
2 dc outputs: 0÷40V, 5A / 0÷5V, 10A
2 ac/dc ammeters: 1-5-10A
2 ac/dc voltmeters: 10-50-100V
1 wattmeter: 1-5-10A, 10-50-100V
Resistive, capacitive and inductive loads
Power supply: 220 V, 50/60 Hz

DL 10103TG

Download Area

ProductsCodeCatalogueTender specsManuals SimpleVideo
BENCH FOR THE STUDY OF THREE-PHASE ASYNCHRONOUS MOTORSDL MAC-AT
BENCH FOR THE STUDY OF THREE-PHASE SYNCHRONOUS MACHINESDL MAC-ST
BENCH FOR THE STUDY OF SINGLE-PHASE MOTORSDL MAC-SP
BENCH FOR THE THE STUDY OF DIRECT CURRENT MACHINESDL MAC-DC
BENCH FOR THE STUDY OF SINGLE-PHASE AND THREE-PHASE TRANSFORMERSDL MAC-TT
BENCH FOR THE STUDY OF SPEED CONTROL OF DC MOTORSDL MAC-CCC
BENCH FOR THE STUDY OF SPEED CONTROL OF AC MOTORSDL MAC-CCA
LIST OF MODULES FOR THE ELECTRICAL MACHINES (0.3 kW)
LIST OF MODULES FOR THE ELECTRICAL MACHINES (1.1 kW)
BENCH FOR THE STUDY OF THE MOTOR AUTOMATIONDL MA-PLC
SINGLE-PHASE TRANSFORMER TRAINERDL 10103TG