Inverter module for controlling brushless direct current (DC) motor

A technology of DC motor and inverter module, applied in the direction of converting AC power input to DC power output, electrical components, electronic commutators, etc. And the effect of static index, high capacity index and low cost

Active Publication Date: 2013-01-23
SHENZHEN ACAD OF AEROSPACE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, good current closed-loop control for the three-phase square-wave brushless DC motor has not been realized. Therefore, in the existing high-performance servo control system, the square-wave brushless permanent magnet DC motor is usually not used, but the AC servo motors or sine wave brushless permanent magnet DC motors, the result is a significant increase in control system complexity and overall high cost

Method used

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  • Inverter module for controlling brushless direct current (DC) motor
  • Inverter module for controlling brushless direct current (DC) motor
  • Inverter module for controlling brushless direct current (DC) motor

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Embodiment Construction

[0043] In a preferred embodiment of the present invention, a servo control system of a three-phase square wave brushless permanent magnet DC motor is provided, the principle of which is as follows figure 1 shown. It can be seen from the figure that the control system includes a three-phase bridge inverter circuit 101, a current sensor 102 connected to the inverter bridge, a current converter 112 that converts the sensing signal of the current sensor, and a current regulator connected in sequence Device 108, PWM modulation circuit 103, and pre-driver circuit 107. Wherein, the three-phase bridge inverter circuit 101 outputs working power to the three-phase square wave brushless permanent magnet DC motor 105 . The current converter outputs sensing signals from the linear Hall element 106 .

[0044] Such as figure 2 As shown, in a preferred embodiment of the present invention, the current sensor includes three sampling coils L1, L2, and L3 with the same number of turns, and th...

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Abstract

The invention relates to the control technology of a three-phase direct current (DC) motor. In order to solve the problem that good current closed-loop control can not be realized aiming at the three-phase square wave brushless DC motor in the prior art, the invention provides a new scheme for realizing current closed-loop control on a square-wave brushless permanent magnet DC motor. In the new scheme, a brushless DC motor control system, a control method of the brushless DC motor control system and a corresponding inverter module are provided. Cathodes of freewheeling diodes D1, D3 and D5 are independent of the input ends of respective switches and are mutually connected to a sampling coil L2 in parallel, and / or the anodes of the freewheeling diodes D2, D4 and D6 are independent to the output ends of the respective switches and are mutually connected to a sampling coil L3 in parallel. In the invention, a single synthesized current sensor can be used for integrally and continuously sampling the three-phase currents of the motor in the cases of breakover and flow current, and a single current closed-loop adjustor is used for carrying out continuous closed-loop control on the three-phase currents, thereby greatly improving the dynamic and static indexes of the motor.

Description

[0001] The patent application of the present invention is a divisional application with the application number "200710072970.2". The filing date of the original application is January 15, 2007, and the name of the original application is "Brushless DC motor control system and its control method". technical field [0002] The present invention relates to the control technology of three-phase DC motors, more specifically, to an inverter module for controlling a brushless DC motor, a brushless DC motor control system using the inverter module, and a control method for the system; The scheme of the invention is especially suitable for the servo control of the three-phase square wave brushless permanent magnet DC motor. Background technique [0003] The square wave brushless permanent magnet DC motor is a special brushless DC motor, and its phase current and air gap magnetic field are approximately square waves or trapezoidal waves. For a brushless DC permanent magnet motor drive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02P6/16H02P6/17
Inventor 李铁才周兆勇漆亚梅孙翔王爽汤平华
Owner SHENZHEN ACAD OF AEROSPACE TECH
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