Permanent magnet synchronous motor deadbeat torque prediction control method

Abstract

The present invention discloses a permanent magnet synchronous motor deadbeat torque prediction control method. Based on a permanent magnet synchronous motor mathematical model, an electromagnetic torque difference equation and a stator flux linkage amplitude square of a motor are derived, a system of linear equations in two unknowns formed by the two equations is solved to calculate the given motor stator voltage meeting the electromagnetic torque and the stator flux linkage deadbeat control. The system can achieve a motor electromagnetic torque and a stator flux linkage output following reference value in a control period. Compared to a traditional direct torque control method, the torque and the flux linkage response speed is faster, a space vector pulse width modulation policy is employed, the inverter switching frequency is constant, the torque flux linkage rippers are smaller, and the system loss is lower; and compared to a traditional deadbeat direct torque and flux control method, the computing amount is smaller, and the permanent magnet synchronous motor dead-beat torque prediction control method is easily achieved in the digital control system.

Description

technical field

[0001] The invention relates to a motor control method, in particular to a deadbeat torque prediction control method of a permanent magnet synchronous motor. Background technique

[0002] Permanent magnet synchronous motors have high efficiency and high torque density, and are very suitable for applications that require large torque output, such as electric vehicle drive systems. At present, the control strategies of permanent magnet synchronous motors mainly include vector control and direct torque control. The purpose of vector control is to control the stator current of the motor, and the direct torque control directly controls the output torque of the motor. Therefore, direct torque control is more advantageous in situations where the torque response speed is required to be high. However, in the traditional direct torque control, the control of torque and flux linkage adopts a two-position bang-bang controller, which makes the switching frequency of the ...

Examples

Embodiment Construction

[0062] The key technologies and specific implementation methods in the present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0063] A deadbeat torque prediction control method for a permanent magnet synchronous motor of the present invention, comprising the following steps:

[0064] 1. Define f dq =f d +j·f q , where j is an imaginary number unit, f can represent voltage v, current i and flux linkage ψ, the purpose is to use a single variable f dq conveniently expresses f d and f q .

[0065] 2. Obtain the phase current, phase voltage, and speed signal of the motor at the current sampling time (k time) (the actual speed of the rotor n(k) and the electrical angular velocity ω e (k)) and rotor position (θ e (k)), the phase voltage is more complex due to direct measurement, and generally can be directly calculated according to the control signal; the current of the motor in the synchronous rotating coordinate syste...

technical field

[0001] The invention relates to a motor control method, in particular to a deadbeat torque prediction control method of a permanent magnet synchronous motor. Background technique

[0002] Permanent magnet synchronous motors have high efficiency and high torque density, and are very suitable for applications that require large torque output, such as electric vehicle drive systems. At present, the control strategies of permanent magnet synchronous motors mainly include vector control and direct torque control. The purpose of vector control is to control the stator current of the motor, and the direct torque control directly controls the output torque of the motor. Therefore, direct torque control is more advantageous in situations where the torque response speed is required to be high. However, in the traditional direct torque control, the control of torque and flux linkage adopts a two-position bang-bang controller, which makes the switching frequency of the ...

Examples

Embodiment Construction

[0062] The key technologies and specific implementation methods in the present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0063] A deadbeat torque prediction control method for a permanent magnet synchronous motor of the present invention, comprising the following steps:

[0064] 1. Define f dq =f d +j·f q , where j is an imaginary number unit, f can represent voltage v, current i and flux linkage ψ, the purpose is to use a single variable f dq conveniently expresses f d and f q .

[0065] 2. Obtain the phase current, phase voltage, and speed signal of the motor at the current sampling time (k time) (the actual speed of the rotor n(k) and the electrical angular velocity ω e (k)) and rotor position (θ e (k)), the phase voltage is more complex due to direct measurement, and generally can be directly calculated according to the control signal; the current of the motor in the synchronous rotating coordinate syste...

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