Commutation control method for high-speed brushless direct current motor
A brushed DC motor, phase control technology, applied in the direction of electronic commutation motor control, control system, electronic commutator, etc., can solve the problem that the winding inductance current cannot change instantaneously without considering the winding inductance current, so as to improve the dynamic response performance, reduce the Three-phase current and loss, the effect of good practical effect
Active Publication Date: 2022-04-15
ZHEJIANG UNIV +1
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However, this method does not consider that the current caused by the winding inductance cannot change instantaneously, and it takes a certain time for the phase current to reach a given value.
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Embodiment 1
[0092] Combine below Figure 1-Figure 12 , and specific calculation formulas to introduce the scheme of the embodiment.
[0093] 1. Topology of high-speed brushless DC motor system based on quasi-current source inverter
[0094] figure 1 It is an equivalent circuit of a high-speed brushless DC motor system based on a quasi-current source inverter, including a quasi-current source inverter and a high-speed brushless DC motor. Among them, the quasi-current source inverter is mainly composed of inductors L D , freewheeling diode current D 0 And power tube (MOSFET tube). Power tube S 7 source, power tube S 8 The drain and inductance of the L D One end of the inductor is connected, and the other end of the inductor is connected to the freewheeling diode D 0 the anode of the diode D 0 The negative pole of the power tube S is connected 7 the drain, D 7 with D 8 Respectively represent the power tube S 7 and S 8 antiparallel diodes. The positive and negative poles of ...
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The invention discloses a commutation control method for a high-speed brushless direct current motor. According to the method, for a high-speed brushless direct current motor system, the working mode of the motor is divided into a low-speed operation mode and a high-speed operation mode according to the current change rate of a turn-off phase and a turn-on phase, and the commutation period is divided into a commutation stage and a normal conduction stage. A three-phase current expression of a commutation stage is established according to current flow directions of the commutation stage and a normal conduction stage in different operation modes, then a three-phase current average value of the commutation stage is calculated and obtained, electromagnetic work is obtained by combining a three-phase counter electromotive force average value, the electromagnetic work is processed to obtain a commutation stage boundary moment, and a three-phase counter electromotive force boundary moment is obtained. And a lead commutation angle is obtained by using a commutation phase boundary moment, and then commutation control is realized. According to the method, the dynamic response performance is good in the whole control process, calculation is simple, loss is reduced, and the torque current ratio and the system efficiency are improved.
Description
technical field [0001] The invention relates to a control method of a high-speed brushless DC motor, in particular to a maximum average electromagnetic power commutation control method of a high-speed brushless DC motor based on a quasi-current source inverter. Background technique [0002] High-speed brushless DC motors have the advantages of high power density, simple structure, and high efficiency. They are widely used in occasions with high speed, high transmission accuracy, and high requirements for equipment quality and space, such as household appliances, spindle motors, textile industry and aviation. Aerospace and other fields. [0003] At present, most high-speed brushless DC motors are driven and controlled by voltage source inverters, and PAM modulation is used to adjust the DC bus voltage. However, at low speeds, the PAM modulation method is difficult to output a very low voltage, and the two modulation methods of PAM and PWM are required to cooperate, resulting...
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IPC IPC(8): H02P6/182H02P6/15H02P6/34
Inventor 夏长亮郑申肖曹彦飞林治臣李晨阎彦史婷娜
Owner ZHEJIANG UNIV