Field-weakening control method for permanent magnet synchronous motor

A permanent magnet synchronous motor and field-weakening control technology, which is applied in motor control, motor generator control, AC motor control, etc., can solve the problems of easy instability of motor vibration, reduce motor vibration, and reduce current ripple. wave, increasing the stability effect

Active Publication Date: 2017-11-24

SHANGHAI SIGRINER STEP ELECTRIC

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Problems solved by technology

In field weakening control (such as no current loop field weakening control and single current loop field weakening control methods),...

Method used

As shown in Figure 3, in another embodiment of the present invention, also can add high-frequency q-axis compensating current iq " in the q-axis output voltage Uq0 " that single current loop magnetic field weakening control obtains ", to reduce The ripple current in the q-axis current iq of the small permane...

Abstract

The invention discloses a field-weakening control method for a permanent magnet synchronous motor, and the method comprises the steps: a, obtaining a d-axis output voltage Ud0'' and a q-axis output voltage Uq0'' through no-current-loop field-weakening control or single-current-loop field-weakening control; b, adding a high-frequency q-axis compensation current iq'' to the q-axis output voltage Uq0'', so as to reduce the ripple current in an actual q-axis current iq of the permanent magnet synchronous motor. In the field-weakening operation, the method achieves the compensation for a high-frequency quadrature axis current in the q-axis output voltage, reduces the current ripples of the actual q-axis current iq of the permanent magnet synchronous motor and the motor vibration, and improves the operation stability of the motor.

Application Domain

Electronic commutation motor controlAC motor control +6

Technology Topic

Field weakeningMotor vibration +5

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Experimental program(1)

Example Embodiment

[0014] The present invention will be further explained below in conjunction with the drawings.

[0015] figure 2 It shows a control principle block diagram of a permanent magnet synchronous motor field weakening control method according to an embodiment of the present invention. Please refer to figure 2 , The field weakening control method of a permanent magnet synchronous motor according to an embodiment of the present invention and figure 1 Compared with the existing permanent magnet synchronous motor field weakening control method shown, the main difference is that i q High frequency compensation, namely figure 2 The part shown in the dashed box.

[0016] Specifically, a permanent magnet synchronous motor field weakening control method according to an embodiment of the present invention includes the following steps:

[0017] Step a. Obtain the d-axis output voltage U through the field weakening control without current loop d0 〞And q-axis output voltage U q0 ";

[0018] Step b, output voltage U on the q axis q0 Add the high-frequency q-axis compensation current i q ", get the q-axis output voltage U after high-frequency q-axis current compensation q "To reduce the q-axis current i of the permanent magnet synchronous motor 100 q Ripple current in

[0019] Step c. According to the d-axis output voltage U d0 ”And q-axis output voltage U after high-frequency q-axis current compensation q "Generate a PWM signal to control the inverter and drive the permanent magnet synchronous motor 100.

[0020] As described in the background art section, in the non-field weakening area, the permanent magnet synchronous motor 100 is controlled by the MTPA control method.

[0021] Further, in the above step b, the actual q-axis current i of the permanent magnet synchronous motor q After high-pass filtering, the proportional amplification (gain is Kpq) is performed to obtain the high-frequency q-axis compensation current i q ".

[0022] Further, in the above step b, the q-axis output voltage U q0 〞Low-pass filter, the q-axis output voltage after low-pass filter U q0 ”And the preset compensation voltage U margin The result of the addition is combined with the high-frequency q-axis compensation current i q "Add together to get the q-axis output voltage U after high-frequency q-axis current compensation q ", where the preset compensation voltage U margin Is a constant, used to compensate the high-frequency q-axis current i q "Provide voltage margin. In a specific application example, Kpq = 0.3; U margin Equal to 3% to 5% of the output voltage of the motor controller; the cut-off frequency of high-pass filtering is 200Hz, and the cut-off frequency of low-pass filtering is 200Hz.

[0023] Such as image 3 As shown, in another embodiment of the present invention, the q-axis output voltage U obtained by the single current loop field weakening control q0 Add the high-frequency q-axis compensation current i q "To reduce the q-axis current i of the permanent magnet synchronous motor 100 q Ripple current in.

[0024] Single current loop field weakening control includes the following steps:

[0025] Set the given speed ω * The deviation between the feedback speed and the feedback speed ω is adjusted by PI to obtain the d-axis control current i d * ’, the d-axis control current i d * ’And the d-axis actual current i d The deviation between PI is adjusted to obtain the d-axis output voltage U d0 ";

[0026] According to the formula Calculate the q-axis output voltage U q0 ", where U max It is the maximum output voltage limit of the motor controller.

[0027] In the above two embodiments, it is sensorless control. The present invention can also be used for vector control with speed sensors, and the present invention does not limit this.

[0028] The above description is a further description of the present invention in conjunction with the specific embodiments and the drawings. However, the present invention can obviously be implemented in a variety of other methods different from those described here, and those skilled in the art can promote and deduce according to actual use conditions without violating the content of the present invention. Therefore, the content of the above specific embodiments The scope of protection determined by the present invention should not be limited.

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Field-weakening control method for permanent magnet synchronous motor

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Description & Claims & Application Information

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