DC and AC motor driving

Power Electronics » DC and AC motor driving

The power electronics field has become an important topic in the electronics industry and the information technology area (telecom products and electronic consumer appliances requiring many power electronics sub-systems). Typical power electronics applications include electronic ballasts, high voltage DC transmission systems (HVDC), power conditioners, UPS systems, power supplies, power factor correction, rectifiers, electric vehicles and one of the major area of applications is the control and driving of electric motors (from very large motors for industrial and traction applications down to small electric motors in consumer electronic equipment with accurate control of speed, torque and position of the armature, etc.). To highlight the advantages of power electronics laboratory, De Lorenzo has included also three different motors for DC and AC applications; shunt excitation DC motor, slip ring and squirrel cage three-phase motors with powder brake and control unit to demonstrate how power electronic circuits plays a vital role in controlling these motors. There are available three trainers, one for DC motor drive (in single-quadrant, two-quadrant or four-quadrant drive) and two for AC motor drive (properties of slip ring and squirrel cage motors with their speed control). They are dedicated to high schools and first years of university.

Products Details

APPLICATIONS

Motor drives are used in a wide range of power values, from few watts up to many thousands of kilowatts, in applications ranging from high precision position control in robotics to variable speed drives for regulating the rate of flow in pumps.
In all drives where speed and position must be controlled, a power electronics converter is needed as interface between input power and motor.
Constant, or slightly variable according to load, speed drives use almost exclusively induction motors, thanks to their simple, robust and cheap construction, in addition to the fact that they do not need special maintenance.
However, the multi-phase motors supplied at constant network voltage and frequency have a rigid relationship between supply frequency and speed.
Direct current motor drives are mainly used in applications requiring the control of the speed of the motor.
In variable speed drives direct current machines are used everywhere; however, today, with the development of power electronics, induction motor drives are also widely used.
In these cases, the speed of the motor can be varied in three different ways: by varying the number of polar couples, by varying the slip speed, by varying the supply frequency.

DC MOTOR DRIVE

Power electronics studies the application of electronic devices to conversion and control of electrical power with the greatest possible efficiency.
In this laboratory the students can analyze the properties of the DC motor and their control of velocity.
This trainer has a modular structure and it consists of didactic panels installed on a vertical frame. It is supplied with a theoretical and practical manual.
The modularity of this didactic system grants to the students a direct and immediate approach to the topics, offering the opportunity to study various subjects performing several experiments as following:
• Single-quadrant drive with converter B2C
• Single-quadrant drive with converter B2C and armature voltage feedback
• Single-quadrant drive with converter B2C and armature voltage feedback with RI compensation
• Single-quadrant drive with converter B2C and tacho-voltage feedback
• Single-quadrant drive with converter B2C and tacho-voltage feedback with inner current loop
• Two-quadrant drive (I-IV) with converter B2C
• Two-quadrant drive (I-III) with converter (B2C)2I • Two-quadrant drive (I-III) with converter (B2C)2I and tacho-voltage feedback with inner current loop
• Four-quadrant drive with converter (B2C)2I
• Four-quadrant drive with converter (B2C)2I and tacho-voltage feedback with inner current loop
• Single-quadrant drive with converter B6C
• Single-quadrant drive with converter B6C and tacho-voltage feedback with inner current loop

AC SLIP-RING MOTOR DRIVE

Power electronics studies the application of electronic devices to conversion and control of electrical power with the greatest possible efficiency.
In this laboratory the students can analyze the properties of the AC slip ring motor and their control of velocity.
This trainer has a modular structure and it consists of didactic panels installed on a vertical frame.
It is supplied with a theoretical and practical manual.
The modularity of this didactic system grants to the students a direct and immediate approach to the topics, offering the opportunity to study various subjects performing several experiments as following:
• Control of stator voltage with transformer
• Control of stator voltage with controller W3C
• Control of stator voltage and tacho-voltage feedback
• Rotor starter
• Rotor pulsed resistor
• Rotor pulsed resistor and tacho-voltage feedback
• Scherbius static drive
• Scherbius static drive and tacho-voltage feedback

AC SQUIRREL CAGE MOTOR DRIVE

Power electronics studies the application of electronic devices to conversion and control of electrical power with the greatest possible efficiency.
In this laboratory the students can analyze the properties of the AC squirrel cage motor and their control of velocity.
This trainer has a modular structure and it consists of didactic panels installed on a vertical frame. It is supplied with a theoretical and practical manual.
The modularity of this didactic system grants to the students a direct and immediate approach to the topics, offering the opportunity to study various subjects performing several experiments as following:
• Six-pulse PAM
• Pulsed square-wave triggering
• Trapezoidal modulation
• Pulse width modulation (PWM)
• Voltage vector control (VVC)
• Motor magnetization for linear U/f characteristic
• Extra start magnetization
• IxR compensation
• Operation in standard converter setting
• Slip compensation
• Motor operation in star connection
• Brake chopper
• Speed control with tacho-voltage feedback

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ProductsCodeCatalogueTender specsManuals SimpleVideo
DC AND AC MOTOR DRIVINGDCA 205
DC MOTOR DRIVEDCA 205.1
AC SLIP-RING MOTOR DRIVEDCA 205.2
AC SQUIRREL CAGE MOTOR DRIVEDCA 205.3