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
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[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...
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[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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