Torsional groove structure and classification of electrical machine core
In small and medium size motors, the rotor or stator core is often made into a torsional groove, that is, the rotor or stator slot is twisted into a certain shape.This special structure can improve the magnetic circuit to weaken the higher electromagnetic harmonics, so as to achieve smooth waveform of the motor, reduce the noise and vibration of the motor, reduce the loss and improve the efficiency, at the same time, obtain good starting performance and improve the electrical and mechanical impact resistance and vibration resistance of the whole machine.Therefore, torsional groove is of great practical significance to improve the performance index and improve the motor quality.
In small and medium size motors, the rotor or stator core is often made into a torsional groove, that is, the rotor or stator slot is twisted into a certain shape.This special structure can improve the magnetic circuit to weaken the higher electromagnetic harmonics, so as to achieve smooth waveform of the motor, reduce the noise and vibration of the motor, reduce the loss and improve the efficiency, at the same time, obtain good starting performance and improve the electrical and mechanical impact resistance and vibration resistance of the whole machine.Therefore, torsional groove is of great practical significance to improve the performance index and improve the motor quality.
According to the structural torsional mode of the motor core, it can be divided into three categories: unsegmented single torsional inclination, segmented single torsional inclination and segmented double torsional inclination.
It is obviously not possible to process the torsional groove of the motor by high speed punching machine because the torsional groove mold needs to move one step to another specific position after each stroke and then another continuous stroke.Only after the iron chip is superimposed can the required shape be formed.To achieve this
