Rotor Robustness Design for Widening Speed ​​Range of Built-in Permanent Magnet Synchronous Motor

Abstract

The invention relates to a rotor structural robustness design method for widening a built-in permanent magnet synchronous motor speed range. The method comprises: determining the initial rotor structure of a motor and providing a permanent magnet with a single-layer V-shaped structure; improving the rotor structure of the motor; using a Taguchi method to optimize the above improved structural scheme, and determining an optimization variable, an optimization objective and a constraint condition; establishing a factor level table; performing finite element simulation on the motor under differentconditions, and obtaining the values of d-axis inductance, the q-axis inductance and the electromagnetic torque under different factor levels; performing average value analysis; performing variance analysis on a result based on the average analysis; and determining the optimal solution and improving a prototype.

Description

technical field [0001] The invention belongs to the field of motor robustness design, and in particular relates to the robustness design of the rotor structure in the rotational speed range of a built-in permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors are mainly divided into surface mount type, built-in type and claw pole type according to the structure of the rotor magnetic circuit. The built-in permanent magnet synchronous motor is embedded in the rotor core because of the permanent magnet, which causes the asymmetrical and direct axis magnetic circuit ( The direct-axis reluctance is greater than the quadrature-axis reluctance), and the specific performance is that the d-axis inductance is smaller than the q-axis inductance, so it has reluctance torque, which makes it have higher torque density and power density, and compared with the surface mount motor, When the amount of permanent magnets is the same, the d-axis indu...

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Problems solved by technology

[0004] Since most of the magnetic field of the interior permanent magnet synchronous motor is generated by the permanent magnet embedded in the rotor, compared with the electric excitation motor, the permanent magnet magnetic field is difficult to attenuate, which limits the application of the interior permanent magnet synchronous motor to a certain extent. Speed ​​range, when the motor operating environment requires further high-speed operation, the built-in permanent magnet synchronous motor is slightly insufficient

Its maximum speed is related to the permanent magnet flux linkage, d-axis inductance, and phase voltage and phase current limit values. The phase voltage and phase current limit values ​​are fixed values. To obtain a higher speed, it is necessary to reduce the permanent magnet flux linkage or Increasing the d-axis inductance, but reducing the flux linkage of the permanent magnet will reduce the torque of the motor, resulting in a decrease in the output of the motor and weakening the load capacity of the motor. Therefore, a higher speed is usually obtained by increasing the d-axis inductance

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