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Permanent magnet synchronous motor full-speed-domain model prediction flux linkage control method

A technology of permanent magnet synchronous motor and control method, which is applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve the problem of not considering current and torque ripple, etc.

Active Publication Date: 2020-02-11
揭阳市盛佳电机有限公司
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Problems solved by technology

However, this patent does not consider the cumbersome design of weight coefficients in the full-speed domain value function, nor does it consider the problem of large current and torque ripples in model predictive torque control

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  • Permanent magnet synchronous motor full-speed-domain model prediction flux linkage control method
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  • Permanent magnet synchronous motor full-speed-domain model prediction flux linkage control method

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Embodiment Construction

[0048] The present invention will be further explained below in conjunction with the accompanying drawings.

[0049] The schematic diagram of a permanent magnet synchronous motor full-speed domain model predictive flux linkage control method is as follows: figure 1 As shown, it includes speed PI controller 1, model prediction flux linkage control module 2, full-speed domain value function module 3, duty cycle calculation module 4, inverter 5, coordinate transformation module 6, permanent magnet synchronous motor 7 and encoder 8.

[0050] First, the reference torque T is obtained through the speed outer loop PI controller e ref ; Then get the electrical angle θ of the permanent magnet synchronous motor from the motor encoder r and electrical angular velocity ω r , and use the current sensor to obtain the three-phase stator current i at time k a , i b and i c , after coordinate transformation, the d-q axis component i of the stator current at time k is obtained d and i ...

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Abstract

The invention discloses a permanent magnet synchronous motor full-speed-domain model prediction flux linkage control method. The method comprises the steps of firstly, acquiring a reference torque Teref through a rotating speed outer ring PI controller; obtaining an electrical angle theta r and an electrical angle speed omega r of a permanent magnet synchronous motor, obtaining a three-phase stator current at a k moment, and obtaining a d-q axis component of a stator current at the k moment after coordinate transformation; secondly, carrying out flux linkage calculation by combining a flux linkage equation and a load angle to obtain a flux linkage prediction value and a flux linkage reference value at a (k+1) moment; then, constructing a full-speed-domain value function by using the flux linkage prediction value and the reference value at the (k+1) moment, and obtaining an optimal voltage vector of an inverter by minimizing the full-speed-domain value function; and finally, calculatinga duty ratio according to a dead-beat thought of a q-axis flux linkage, and distributing time of the optimal voltage vector and a zero vector acting on the inverter. By using the method of the invention, a current and torque pulsation can be effectively reduced, good dynamic steady-state performance is possessed, and the method can be applied to a constant torque region and a constant power region.

Description

technical field [0001] The invention relates to a full-speed domain model prediction flux linkage control method of a permanent magnet synchronous motor, which belongs to the field of motor drive and control. Background technique [0002] Permanent magnet synchronous motor (Permanent magnet synchronous motor, PMSM) has the advantages of low loss, low temperature rise, high power factor, high starting torque, short starting time, and high overload capacity. Traditional permanent magnet synchronous motor control methods mainly include vector control (Vector control, VC) and direct torque control (Direct torque control, DTC). VC is a linear control method that independently controls flux linkage and torque by controlling excitation current and torque current. However, the coordinate transformation is complicated, and the current regulator is usually PI control, and the PI control has an inertial link and a hysteresis effect, which makes the dynamic performance of the system po...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P6/10H02P6/34
CPCH02P6/10H02P21/141H02P6/34
Inventor 於锋霍闯茅靖峰李凯凯
Owner 揭阳市盛佳电机有限公司
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