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Brushless DC motor vector control system and method based on alpha-beta current controller

A current controller, brushed DC motor technology, applied in vector control systems, control systems, control generators, etc., can solve the problem of the bootstrap capacitor being unable to be charged, to solve the difficulty of charging the bootstrap capacitor, reduce the commutation torque Torque ripple, effect of simplified control algorithm

Inactive Publication Date: 2020-01-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In order to solve the problems of the prior art, the present invention provides a brushless DC motor vector control system and method based on an αβ current controller, which uses a vector control algorithm to generate a rectangular wave current, so that when driving the brushless DC motor to run, Reduces the commutation torque ripple and solves the problem that the bootstrap capacitor cannot be charged in the bootstrap drive circuit

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  • Brushless DC motor vector control system and method based on alpha-beta current controller
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  • Brushless DC motor vector control system and method based on alpha-beta current controller

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Embodiment 1

[0032] as attached figure 1 As shown, a brushless DC motor vector control system based on αβ current controller in this embodiment mainly includes the following modules: speed controller 1, space vector current distributor 2, α current controller 3, β current A controller 4 , an SVPWM module 5 , a three-phase full-bridge inverter 6 , a Clark converter 7 , a brushless DC motor 8 , a rotor position detection module 9 , and a rotational speed calculation module 10 . The rotor position detection module 9 uses a Hall position sensor. Speed ​​controller 1, α current controller 3, and β current controller 4 use PID controllers.

[0033] The principle of field-oriented space vector control in this embodiment is as follows:

[0034] When the back electromotive force of the motor is a sine wave, it is driven by a sine wave current, and the electromagnetic torque fluctuation of the motor is the smallest. The space vector current driven by a sine wave has a continuous rotation angle, s...

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Abstract

The invention relates to the technical field of motor vector control, in particular to a brushless DC motor vector control system and method based on an alpha-beta current controller. According to thecontrol system, three-phase current signals are collected through a current sensor, and then, a three-phase current under an a-b-c coordinate system is converted into a two-phase current under an alpha-beta coordinate system through a Clark converter. A speed controller outputs the modulus of a target space vector current according to a target speed n_ref and a feedback speed n, a space vector current distributor outputs a target two-phase current under the alpha-beta coordinate system according to the position of the rotor and the modulus of the target space vector current, a current controller outputs a two-phase voltage under the alpha-beta coordinate system according to a target current and a feedback current, and then, a three-phase full-bridge inverter is controlled through SVPWM (space vector pulse width modulation) to finish the driving of a DC brushless motor. According to the invention, the driving performance of the brushless DC motor can be improved, the commutation torqueripple can be reduced, and the problem that a bootstrap capacitor in a bootstrap driving circuit cannot be charged is avoided.

Description

technical field [0001] The invention relates to the technical field of motor vector control, in particular to a brushless DC motor vector control system and method based on an αβ current controller. Background technique [0002] Brushless DC motor is a kind of permanent magnet synchronous motor. It not only has the advantages of high efficiency and high power density of permanent magnet motor, but also has the advantages of simple control and good speed regulation performance of DC motor, so it has been widely used. The brushless DC motor (BLDCM) has a trapezoidal wave air-gap magnetic field, which makes it have a higher power density than the permanent magnet synchronous motor (PMSM), but because the energizing current requires a rectangular wave, which makes the brushless DC motor commutation difficult. Continuously, large commutation torque fluctuations will be generated. [0003] When the brushless DC motor is driven to commutate by two-to-two conductive rectangular wav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/05H02P6/10
CPCH02P6/10H02P21/0003H02P21/05
Inventor 赵彦凯崔涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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