Vector control method for vehicle-mounted permanent magnet synchronous motor
A permanent magnet synchronous motor, vector control technology, applied in vector control system, motor generator control, electronic commutation motor control and other directions, can solve the problem of periodic torque fluctuation, affecting the steady-state accuracy of the system, and system instability. , to achieve the effect of reducing delay, reducing current sampling fluctuation and accuracy, and expanding current loop bandwidth
Inactive Publication Date: 2016-03-30
江苏经纬轨道交通设备有限公司
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Problems solved by technology
However, due to current sampling and current loop delay, the system is unstable. At the same time, due to its own magnetic field characteristics such as cogging effect and external commands, the torque will periodically fluctuate, thus affecting the steady-state accuracy of the system.
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[0020] The preferred embodiments of the present invention are described in detail below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.
[0021] according to figure 1 and figure 2 , taking the surface-mounted permanent magnet synchronous motor as an example, explain the parameter setting and usage of the repeating controller.
[0022] The transfer function of the repeating controller is:
[0023] (1)
[0024] The output of the repeat controller is:
[0025] (2)
[0026] In formula (2), K is the sampling point in each cycle, and the value range of K is 0~(N-1). It can be seen from formula (2) that the repetitive controller ignores the compensation controller S(z) When , the output of the repetitive controller at time K of this cycle is the combination of the controller at time K of the previous cycle and the error at time...
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The invention discloses a vector control method for a vehicle-mounted permanent magnet synchronous motor. The vector control method comprises the following steps: step 1, detecting motor speed and obtaining speed feedback v of the motor; step 2, re-calculating a torque current compensation control instruction i*qcomp by adopting a repetitive controller according to deviation e between a comparison speed instruction v* and the speed feedback v; step 3, designing a current sampling and current loop calculating policy; step 4, controlling an excitation current instruction i*d to be equal to 0 according to the current sampling and current loop calculating policy designed in the step 3, and performing current loop PI control by combining the torque current instruction i*q in the step 2; and step 5, working out rotor electric angle theta according to the detected speed feedback v, and through combination with the output voltage under a dp rotating coordinate system in the step 4, generating a PWM chopping wave for controlling the motor by adopting a PWM modulation method that combines asynchronous modulation with synchronous modulation.
Description
technical field [0001] The invention relates to a control method of a motor, in particular to a vector control method of a vehicle-mounted permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor is a high-performance, high-efficiency speed-regulating motor, which is mainly used in high-control precision and high-reliability occasions. It is also widely used in rail transit fields such as trams and electric vehicles. In these occasions, due to the large power of the module and the high requirements for operating frequency, it has the characteristics of low carrier frequency and high operating frequency, resulting in large fluctuations in current sampling and low bandwidth of the current loop, which affects system stability. In addition, the permanent magnet synchronous motor will cause periodic torque fluctuations due to its own magnetic field characteristics and external commands, which will affect the steady-state performance...
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Login to View More IPC IPC(8): H02P21/18H02P21/22
CPCH02P21/14
Inventor 刘巍
Owner 江苏经纬轨道交通设备有限公司