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Motor current harmonic and torque ripple suppression method based on order extraction

A technology of torque pulsation and motor current, applied in torque pulsation control, current controller, motor generator control, etc., can solve the problems of high motor loss, speed pulsation, structural fatigue damage, etc., and achieve good effect of suppressing harmonics , the effect of small calculation and simple operation

Active Publication Date: 2020-07-28
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high motor loss and vibration noise caused by large current harmonics in the

Method used

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  • Motor current harmonic and torque ripple suppression method based on order extraction
  • Motor current harmonic and torque ripple suppression method based on order extraction
  • Motor current harmonic and torque ripple suppression method based on order extraction

Examples

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Example Embodiment

[0051] Example one

[0052] Such as figure 1 As shown, the first embodiment adopts a motor current harmonic suppression method based on order extraction, which is specifically applied to a permanent magnet synchronous motor control system based on a traditional vector control strategy to suppress the 24th order orthogonal axis current harmonics, including The following steps:

[0053] Step 1. When the motor starts running, collect the motor rotation angle θ and the direct axis current signal i at equal angular intervals according to the rotor rotation angle d And quadrature axis current signal i q .

[0054] Step 2: Using the motor rotation angle θ, use the following formula to calculate i d And i q Perform the 24th order single-point Fourier transform in the angular domain to obtain the real part ReI of the 24th order direct-axis current harmonic components d (24) and imaginary part ImI d (24) and the real part ReI of the 24th order quadrature axis current harmonic components q (24...

Example Embodiment

[0066] Example two

[0067] Such as Figure 4 As shown, the second embodiment adopts a torque ripple suppression method based on order extraction, which is specifically applied to a permanent magnet synchronous motor control system based on a traditional vector control strategy to suppress the 24th order speed harmonics, thereby suppressing torque The pulsation includes the following steps:

[0068] Step 1. When the motor starts running, collect the motor rotation angle θ and speed ω at equal angular intervals according to the rotor rotation angle r ;

[0069] Step 2. Using the motor rotation angle θ, use the following formula to calculate ω r Perform the 24th order single-point Fourier transform in the angular domain to obtain the real part ReΩ of the 24th order rotational speed harmonic component r (24) and imaginary part ImΩ r (twenty four):

[0070]

[0071]

[0072] Where: θ i Is the i-th sample value of the angle signal θ, ω r (θ i ) Is the signal ω r The i-th sample value of, N...

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Abstract

The invention discloses a motor current harmonic and torque ripple suppression method based on order extraction. The method comprises the following steps of 1, collecting a motor rotation angle, a rotation speed and a quadrature axis current signal at equal angle intervals according to a rotor rotation angle; 2, constructing an angular domain single-point Fourier transform algorithm; 3, performingorder extraction of the rotating speed and current signals acquired in the step 1 by using an angular domain single-point Fourier transform algorithm in the step 2; 4, obtaining a quadrature axis voltage harmonic wave to be injected through a PI controller; 5, constructing an order single-point inverse Fourier transform algorithm; 6, performing angular domain reconstruction of the quadrature axisvoltage harmonic obtained in the step 4 by using an order single-point inverse Fourier transform algorithm in the step 5 to obtain an injection voltage signal; and 7, superposing the injection voltage signal into a driving voltage instruction value of the motor control strategy to carry out harmonic suppression.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for suppressing motor current harmonics and torque ripple based on order extraction. Background technique [0002] Motors are widely used in the fields of new energy vehicles and robots, but the counter electromotive force harmonics caused by the non-sinusoidal flux density distribution of the motor air gap and the dead zone effect of the inverter will cause multi-order harmonic components in the motor current, and the current harmonics Waves will increase the operating temperature of the motor, increase the loss, and cause vibration and noise of the motor. Current harmonics, cogging torque and mechanical installation errors will cause the torque ripple of the motor, causing problems such as speed ripple and structural fatigue damage. Therefore, suppressing motor current harmonics and torque ripple is of great significance for reducing motor vibration and noise, r...

Claims

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Application Information

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IPC IPC(8): H02P6/28H02P6/10H02P21/22H02P21/14H02P21/05
CPCH02P6/10H02P21/05H02P21/14H02P6/28H02P21/22
Inventor 吴兆乾杨志坚丁康张炜
Owner SOUTH CHINA UNIV OF TECH
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