Phase-shift started permanent magnet motor for drainage pumps

Abstract

The invention relates to a phase-shift started permanent magnet motor for drainage pumps, which relates to a motor. The phase-shift started permanent magnet motor includes a stator part and a motor rotor part. Auxiliary windings and main windings of the stator part generate a stator rotating magnetic field through joint action. A hysteresis loop of the motor rotor part and the stator rotating magnetic field interact to generate a greater starting torque. When the hysteresis loop pulls the motor rotor part into the synchronous speed, a rotor permanent magnet and the stator rotating magnetic field interact to generate a synchronous torque more efficiently. The air gap of the motor is uniform. The starting torque of the motor generated based on the capacitor phase shift effect is large. The cogging torque of the motor is eliminated using a closed-slot stator core. The input power of the motor is reduced under the premise of significantly improving the starting torque of the motor. The efficiency of the drainage pumps of washing machines can be improved. The pole arc width of the stator poles of the motor is large, and the efficiency of the motor is further improved.

Description

technical field [0001] The invention relates to a phase-shift start permanent magnet motor for a drain pump, which relates to a motor, in particular to a phase shift start permanent magnet motor applied to a drain pump of a washing machine. Background technique [0002] Most common washing machine drainage pump motors use 40W permanent magnet motors. According to China Light Industry Standard "QB / T4273-2011 Technical Requirements for Washing Machine Drain Pumps", the efficiency of permanent magnet motor drainage pumps less than 50W is 7%. The reason for the low efficiency of the washing machine drain pump is the low efficiency of the washing machine drain pump motor, in addition to the structural factors of the drain pump. [0003] One of the reasons for the low efficiency of permanent magnet motors for ordinary washing machine drain pumps is that the starting torque generated by the stepped air gap structure is small. Ordinary washing machine drainage pump permanent magnet...

AI Technical Summary

Problems solved by technology

Since this type of clutch enables the washing machine drain pump to start without load for only less than one revolution of the permanent magnet motor rotor, the increase in starting torque is very limited

The above two factors cause the starting torque of the permanent magnet motor to be small, and the starting torque of the motor can only be increased by increasing the input power of the motor, so that the efficiency of the permanent magnet motor of the ordinary washing machine drainage pump is low

In addition, the U-shaped stator core of the ordinary washing machine drainage pump permanent magnet motor has a small stator pole arc width, which leads to a decrease in the electromagnetic torque of the motor and further reduces the efficiency of the motor.

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