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PERMANENT MAGNET
MOTORS
Special Types of Motors
INTRODUCTION
A special type of motor
A permanent magnet AC (PMAC) motor is a synchronous motor, meaning
that its rotor spins at the same speed as the motor's internal rotating
magnetic field.
 PMAC, PM synchronous, and brushless ac are synonymous terms.
CHARACTERISTICS
In a PM motor the poles are made of permanent magnets
CHARACTERISTICS
Permanent magnets
CHARACTERISTICS
In a conventional dc motor with a wound-field circuit, flux per pole depends on the
current through the field winding and can be controlled.
However, flux in a PM motor is essentially constant and depends on the point of
operation.
CHARACTERICTICS
For the same power output, a PM motor has higher efficiency and requires less
material than a wound dc motor of the same ratings.
Since the flux in a PM motor is fixed, the speed- and current-torque characteristics are
basically straight lines as shown in Fig. 12.2 in the next slide.
ADVANTAGE
3 times higher torque to weight ratio than compared to induction motor
ADVANTAGES
PM motors are compact, efficient and do not require cooling fan
Used in higher-end applications requiring precisely metered torque,
speed, or positioning
Permanent-magnet fields are, by definition, constant and not
subject to failure, except in extreme cases of magnet abuse and
demagnetization by overheating.
Produces less noise
DISADVANTAGE
3 times as expensive as induction motors
May be subject to demagnetization under service condition
Lifetime of a asynchronous motor is much higher than PM motors
PM motors can not be used at high temperatures
Asynchronous is easier to repair than of the PM motors in a short
circuit failure
APPLICATION
PM motors are used within traction and for hybrid cars and for
electrical machines
APPLICATION
Food processing industry
APPLICATION
Motor range of PM motors
 Hybrid cars up to 15kW
 Larger SUV up to 150 kW
 Traction up to 1000 kW
 Wind turbines up to 500 kW probably 1000kW
 Small motors in heat pumps
 Servo motor up to 12kW

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Permanent Magnet Motors

  • 2. INTRODUCTION A special type of motor A permanent magnet AC (PMAC) motor is a synchronous motor, meaning that its rotor spins at the same speed as the motor's internal rotating magnetic field.  PMAC, PM synchronous, and brushless ac are synonymous terms.
  • 3. CHARACTERISTICS In a PM motor the poles are made of permanent magnets
  • 5. CHARACTERISTICS In a conventional dc motor with a wound-field circuit, flux per pole depends on the current through the field winding and can be controlled. However, flux in a PM motor is essentially constant and depends on the point of operation.
  • 6. CHARACTERICTICS For the same power output, a PM motor has higher efficiency and requires less material than a wound dc motor of the same ratings.
  • 7. Since the flux in a PM motor is fixed, the speed- and current-torque characteristics are basically straight lines as shown in Fig. 12.2 in the next slide.
  • 8. ADVANTAGE 3 times higher torque to weight ratio than compared to induction motor
  • 9. ADVANTAGES PM motors are compact, efficient and do not require cooling fan Used in higher-end applications requiring precisely metered torque, speed, or positioning Permanent-magnet fields are, by definition, constant and not subject to failure, except in extreme cases of magnet abuse and demagnetization by overheating. Produces less noise
  • 10. DISADVANTAGE 3 times as expensive as induction motors May be subject to demagnetization under service condition Lifetime of a asynchronous motor is much higher than PM motors PM motors can not be used at high temperatures Asynchronous is easier to repair than of the PM motors in a short circuit failure
  • 11. APPLICATION PM motors are used within traction and for hybrid cars and for electrical machines
  • 13. APPLICATION Motor range of PM motors  Hybrid cars up to 15kW  Larger SUV up to 150 kW  Traction up to 1000 kW  Wind turbines up to 500 kW probably 1000kW  Small motors in heat pumps  Servo motor up to 12kW