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Rapid calculation method for PWM harmonic loss of permanent magnet motor

A permanent magnet motor and harmonic loss technology, which is applied in the control of generators, motor generators, electronically commutated motors, etc., can solve time-consuming problems and achieve the effect of increasing calculation speed and shortening calculation time

Active Publication Date: 2020-03-13
HOHAI UNIV
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Problems solved by technology

[0003] At present, the field-circuit coupling finite element calculation with PWM voltage source as the input and the method of analyzing the iron loss model need to adopt a small step size to distinguish the high-frequency PWM harmonic voltage, which makes it time-consuming to calculate the iron consumption by this method. very time consuming

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  • Rapid calculation method for PWM harmonic loss of permanent magnet motor
  • Rapid calculation method for PWM harmonic loss of permanent magnet motor
  • Rapid calculation method for PWM harmonic loss of permanent magnet motor

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Embodiment Construction

[0047] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0048] This embodiment takes the embedded permanent magnet synchronous motor applied in Prius2010 as an example for calculation.

[0049] The method for quickly calculating the PWM harmonic iron loss in its silicon steel sheet includes the following specific steps:

[0050] Step 1, with i d0 =-64.9A, i q0 =76.04A is the input, and the rotor electrical angle θ e From 0 to 360° static finite element calculation, the magnetic density of each mesh is obtained.

[0051] Step 2, according to the calculation results of the previous step, use the frozen tensor incremental permeability method to construct θ e A linear AC small-signal model of a permanent magnet motor at different rotor positions.

[0052] Step 3, using the constructed linear AC small-signal model of the permanent magnet motor, use the linear frequency domain finite element meth...

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Abstract

The invention discloses a rapid calculation method for PWM harmonic loss of a permanent magnet motor. The method comprises the steps of firstly, adopting the static finite element calculation to obtain the flux density distribution in a permanent magnet motor silicon steel sheet; then constructing a permanent magnet motor alternating current small signal model based on a freezing increment tensormagnetoresistance method, calculating the loss factors on a stator and a rotor under the respectively excitation of the d-axis and q-axis high-frequency harmonic voltages by adopting a frequency domain finite element method, and calculating the PWM harmonic iron loss on the stator and the rotor quickly by directly utilizing the PWM voltage frequency spectrums on the stator and the rotor respectively; and finally, fitting the change relationship of the eddy current loss factors along with a fundamental current through a quadratic polynomial to realize the rapid calculation of the PWM harmonic iron loss of the permanent magnet motor in a whole working range. The method overcomes the defect of high time consumption in the prior art, and has both accuracy and rapidity.

Description

technical field [0001] The invention belongs to the field of permanent magnet motors, and in particular relates to a calculation method for PWM harmonic loss of permanent magnet motors. Background technique [0002] In order to adjust the output power and speed of the permanent magnet motor in real time, the permanent magnet motor is usually used in conjunction with a PWM (Pulse Width Modulated, pulse width modulated) voltage source inverter. On the other hand, the voltage harmonics generated by the PWM voltage source inverter will induce additional PWM harmonic iron loss in the silicon steel sheet, thereby increasing the loss of the motor, causing a decrease in efficiency and an increase in temperature rise. Therefore, designers need to carry out accurate modeling calculations for this phenomenon when designing motors, so as to lay the foundation for optimal design. [0003] At present, the field-circuit coupling finite element calculation with PWM voltage source as the in...

Claims

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Application Information

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IPC IPC(8): H02P21/14
CPCH02P21/14
Inventor 朱洒
Owner HOHAI UNIV
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