Induction Motor or Permanent Magnet Motor, which is better?
Work principles and structure differences
Induction motor (Asynchronous motor)
Principle: The stator windings are connected with three-phase alternating current to produce rotating magnetic field, and the rotor conductor cuts the magnetic induction line to produce the induced current, which forms the electromagnetic torque to drive the rotor to rotate (the slip makes the rotor speed lower than the synchronous speed)
Structure: no permanent magnet, the rotor is squirrel cage or wound structure, the stator is copper wire winding, large volume (net weight 6-28kg)
Representative model: RY-P16
Permanent magnetic motor
Principles: A permanent magnet is used to generate a fixed magnetic field, and after the stator is electrified, it interacts with the rotor magnetic field to achieve synchronous rotation (rotation speed of the rotor is synchronized with the magnetic field).
Structure: rotor with permanent magnet, stator for copper wire winding, small size and light weight (net weight 3-14kg)
Representative models: RY-8090P
Difference between induction motors and permanent magnet motors
1. The permanent magnet motor is composed of stator, rotor and end cover. The induction motor is composed of Denso generator and three-phase synchronous generator.
2. After the permanent magnetic electrical mechanism is completed, it does not require external energy to maintain its magnetic field, and the induction motor is highly efficient when it is at high speed and low torque.
3. Permanent magnetic motors are suitable for small power situations, and induction motors are suited for a wide range of speed control
4. A permanent magnetic motor stator is a permanent magnetic structure, and an induction motor is made of a coil tightly wrapped.
What is the difference between an induction motor and a permanent magnet motor?
Induction motor can obtain a rotating torque to put the rotor in the rotating magnetic field. The simple configuration of permanent magnet motor improves the reliability of the motor. However, permanent magnet motor may cause demagnetization in the environment of large temperature variation, so the reliability of the motor is poor.
In general, permanent magnet and induction motors have advantages. When a permanent magnet motor works, it reduces the iron consumption of the accumulator rings and brushes when the motor runs, and high efficiency can better improve the range, while induction motors operate in high speed and low torque efficiently and are suitable for industrial applications that do not require speed control.