BSG motor flux-weakening control method and system
A BSG motor, field weakening control technology, applied in control systems, motor control, vector control systems, etc., can solve the problems of complex field weakening control, difficult to achieve deep field weakening control, and the inability of BSG motors to expand speed by field weakening. The field weakening control algorithm is simple and easy to implement, and the speed control is stable.
Inactive Publication Date: 2017-12-15
浙江安美德汽车配件有限公司
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Problems solved by technology
For permanent magnet synchronous type BSG motors, the center point (-ψf / Ld,0) of the voltage limit ellipse may be located outside the current limit circle. At this time, at higher speeds, the voltage limit ellipse and the current limit circle have no intersection area , the BSG motor cannot be expanded to this speed by field weakening
[0006] Therefore, there are problems and shortcomings in the prior art that the field weakening control is more complicated, and it is difficult to achieve deep field weakening control
Method used
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Embodiment Construction
[0042] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.
[0043] Such as figure 2 As shown, a BSG motor field weakening control method to obtain the target speed of the BSG motor , the BSG motor target speed and speed setting threshold For comparison.
[0044] When the BSG motor target speed Less than the speed setting threshold When , the torque output is controlled by the maximum torque current ratio to obtain the target torque. The torque output is controlled by the maximum torque-current ratio to obtain the target torque. Specifically, the target torque is obtained by the formula (1) and made =0,
[0045] (1)
[0046] in, is the electromagnetic torque of the motor, is the number of pole pairs of the motor rotor, is the permanent magnetic flux linkage 1, is the quadrature current.
[0047] When the BSG motor target speed Greate...
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The present invention relates to the BSG (Belt Generator Starter) motor control technology field, especially to a BSG motor flux-weakening control method and system. The BSG motor flux-weakening control method comprises: obtaining a BSG motor target rotation speed Wm, comparing the BSG motor target rotation speed Wn with a rotation speed setting threshold value Wth, when the Wm is smaller than the Wth, controlling torque output through maximum torque current to obtain a target torque, and when the Wn is larger than or equal to the Wth, regulating exciting voltage to regulate exciting current to realize flux-weakening control and controlling the torque output through a current horicycle to obtain a target torque. The BSG motor flux-weakening control method and system can control the exciting voltage to realize reduction of an excitation magnetic field so as to reach the purpose of flux weakening speed extension.
Description
technical field [0001] The invention relates to the technical field of BSG motor control, in particular to a field weakening control method and system for a BSG motor. Background technique [0002] As automobile fuel consumption regulations become more and more stringent, hybrid technology emerges at the historic moment. BSG (Belt GeneratorStarter belt-driven starter generator) motor technology has been widely used in hybrid vehicles due to its high cost performance and superior scalability. application. The BSG motor is installed on the traditional engine, and is connected to the output shaft of the engine through a belt. There is a speed ratio between the BSG motor and the engine, so that the BSG working speed needs to reach about 20000rpm / min. Therefore, the BSG motor must adopt the field weakening control technology to meet the Wide speed range of speed regulation requirements. [0003] Most of the existing BSG motors use permanent magnet synchronous motors. Since the ...
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IPC IPC(8): H02P21/22
CPCH02P21/22H02P2205/07
Inventor 杨成武黄璐邓泽选沈润荣杨雪谢东晓
Owner 浙江安美德汽车配件有限公司