Outer rotor permanent magnet induction motor and working method

Abstract

The invention discloses an outer rotor permanent magnet induction motor and a working method. The outer rotor permanent magnet induction motor comprises a main shaft, and the outer side of the main shaft is sequentially provided with a stator, a first rotor and a second rotor; a first air gap is arranged between the stator and the first rotor, and a second air gap is arranged between the first rotor and the second rotor; the stator comprises a stator iron core, a stator winding is arranged on the stator iron core, and the stator winding is a three-phase symmetrical alternating current winding; the first rotor comprises a first rotor support, the first rotor support is provided with a first rotor iron core, and the first rotor iron core is provided with a first rotor starting winding and a permanent magnet. The second rotor comprises a second rotor iron core, and a second rotor winding is arranged on the second rotor iron core; the starting current of the motor is effectively reduced, and the power density, electromagnetic torque and efficiency of the motor are improved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to an outer rotor permanent magnet induction motor and a working method. Background technique [0002] Three-phase wound induction motors are widely used in places that require high starting performance and speed regulation performance because the rotor can be connected with an external resistor. However, there are still some deficiencies in the application of three-phase wound induction motors, which are mainly manifested in two aspects. One is that the starting current is too large. In order to reduce the starting current, a large starting resistance must be connected in series. Low, both of these aspects will cause a lot of power loss. [0003] Permanent magnet motors do not require excitation windings for excitation, and have the advantages of high efficiency, high power density, high torque density, and simple rotor structure. However, permanent magnet motors cannot adjust the ...

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Problems solved by technology

However, there are still some deficiencies in the application of three-phase wound induction motors, which are mainly manifested in two aspects. One is that the starting current is too large. In order to reduce the starting current, a large starting resistance must be connected in series. low, both of these aspects will result in a large power loss

[0003] Permanent magnet motors do not require excitation windings for excitation, and have the advantages of high efficiency, high power density, high torque density, and simple rotor structure. However, permanent magnet motors cannot adjust the magnetic field because the polarity of the permanent magnets is fixed. It is not as good as a three-phase induction motor, and the permanent magnet motor usually needs to be powered by a frequency converter to start, which increases the complexity and cost of the system

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