Loss suppression method for permanent magnet synchronous motor

Abstract

The invention discloses a loss suppression method of a permanent magnet synchronous motor. The method comprises the following steps: Step 1: determining the minimum value and the polar arc coefficientof the thickness of the magnetic steel in the magnetizing direction; Step 2: calculating the maximum value of the thickness of the magnetic steel in the magnetizing direction according to the minimumvalue of the thickness of the magnetic steel in the magnetizing direction; Step 3: determining a thickness change rule; Step 4: designing a magnetic isolation air gap according to the thickness change rule; and Step 5: installing a security control device. The invention provides a loss suppression method of the permanent magnet synchronous motor, which effectively solves the problem of large eddycurrent loss of a fractional slot permanent magnet synchronous motor, further reduces the total loss of the motor, improves the efficiency of the motor, reduces the temperature rise of the motor, reduces the iron loss of the motor to a certain extent, and can reduce the cogging torque of the motor.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method for suppressing losses of permanent magnet synchronous motors. Background technique [0002] The fractional slot permanent magnet synchronous motor is a multi-pole motor, because its yoke is thin, which can effectively increase the diameter of the air gap, thereby effectively increasing the output capacity of the motor; if a concentrated winding is used, the end of the winding will be very short, and the winding Low resistance can effectively reduce copper loss, so the torque density of fractional slot concentrated winding motor is relatively large. [0003] Fractional slot concentrated winding permanent magnet synchronous motor has the characteristics of easy off-line, low copper consumption, high torque density, etc., so it has been widely used, but the fractional slot permanent magnet synchronous motor has a large back EMF The loss is relatively large; at the same tim...

AI Technical Summary

Problems solved by technology

[0003] Fractional slot concentrated winding permanent magnet synchronous motor has the characteristics of easy off-line, low copper consumption, high torque density, etc., so it has been widely used, but the fractional slot permanent magnet synchronous motor has a large back EMF The loss is relatively large; at the same time, when the grid load is light, the grid voltage is high, and the DC bus voltage of the permanent magnet synchronous motor increases, which will lead to an increase in the loss of the inverter equipment

Images