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Soft start control system for high-speed brushless DC motor

A technology for DC motors and control systems, applied in the direction of DC circuits that can reduce harmonics/ripples, starting devices, etc., can solve problems such as high harmonic content, large starting current, etc., to improve operating efficiency and life, reduce The effect of starting current and reducing the eddy current loss of the rotor body

Inactive Publication Date: 2012-11-21
BEIJING HAISIDE MOTOR TECH
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Problems solved by technology

[0005] The technical problem solved by the present invention is: solve the problem of large starting current and high harmonic content of the existing high-power high-speed brushless DC motor; propose a soft start control system for high-power high-speed brushless DC motor, the system has The advantages of small starting current and low harmonic content of starting current

Method used

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  • Soft start control system for high-speed brushless DC motor
  • Soft start control system for high-speed brushless DC motor
  • Soft start control system for high-speed brushless DC motor

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Embodiment Construction

[0019] Such as figure 1Shown is a high-speed brushless DC motor soft start control system, including a controllable three-phase rectifier bridge 1, an electrolytic capacitor bank 2, a DC chopper 3, a brake circuit 4, a current sensor 5, a three-phase inverter bridge 6, Brushless DC motor 7 , line counter electromotive force zero-crossing signal detection circuit 8 , digital controller 9 , filter circuit 10 , program-controlled amplifier 11 , second voltage sensor 12 , and first voltage sensor 13 . The three-phase power supply outputs DC voltage U1 after passing through the controllable three-phase rectifier bridge 1. U1 is connected in parallel with electrolytic capacitor group 2 for filtering. The input voltage of the device 3, after passing through the DC chopper, outputs a controllable DC voltage U2 with a lower amplitude. The two ends of U2 are connected in parallel with the second voltage sensor 12 for voltage detection, and the current sensor 5 is connected in series wit...

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Abstract

A soft start control system for a high-speed brushless DC motor mainly comprises a digital controller, a controllable three-phase rectifier bridge, a DC chopper, a three-phase inverter bridge, a current sensor, the high-speed brushless DC motor and other parts. In order to solve the problem that the start current of the high-speed brushless DC motor is large, the controllable three-phase rectifier bridge and the DC chopper are adopted to carry out two-stage voltage modulation so as to control the DC bus voltage of the three-phase inverter bridge; and the digital controller is adopted to regulate the duty ratio of five-path PWM (Pulse-Width Modulation) drive signals and six-path phase commutation signals according to three-phase inverter bridge DC bus current feedback signals and motor rotation speed feedback signals and control the three-phase inverter bridge DC bus voltage and the phase commutation frequency so as to realize the voltage-reduction variable-frequency soft start of the brushless DC motor. The soft start control system provided by the invention effectively solves the soft start problem of the high-speed brushless DC motor, and has a significant application value for the research of the soft start control of the high-speed brushless DC motor.

Description

technical field [0001] The invention relates to a soft start control system for a high-speed brushless DC motor, in particular a soft start control system using a brushless DC motor position sensor control mode with low motor loss, which can be used as high-power high-speed equipment such as molecular pumps, centrifuges, and compressors A soft start control system for high-power high-speed motors. Background technique [0002] High-power high-speed brushless DC motors used in high-power high-speed equipment such as molecular pumps, centrifuges, and compressors usually have the characteristics of small armature inductance. Brushless DC motors with small armature inductance are prone to the problems of large starting current and high harmonic content. Large starting current will increase the copper loss of the motor, and high harmonic content will increase the eddy current loss of the motor rotor. Excessive motor loss will quickly form a heat source inside the motor, causing...

Claims

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Application Information

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IPC IPC(8): H02P6/20H02J1/02
Inventor 何延昭房建成洪势吴蓉韩邦成郑世强孙津济
Owner BEIJING HAISIDE MOTOR TECH
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