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Brushless DC (direct current) motor 180-degree square wave control method and module and converter

A technology of brushed DC motor and control method, which is applied in the direction of AC motor control, single motor speed/torque control, control system, etc., can solve the problem that SVPWM modulation cannot be used, and achieve the effect of reducing current harmonics

Active Publication Date: 2014-03-19
SHANGHAI STEP ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unlike general AC motors, since brushless DC motors only work in two phases at the same time, it is impossible to use SVPWM modulation, which has been widely used in AC motor control.

Method used

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  • Brushless DC (direct current) motor 180-degree square wave control method and module and converter
  • Brushless DC (direct current) motor 180-degree square wave control method and module and converter
  • Brushless DC (direct current) motor 180-degree square wave control method and module and converter

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] see figure 1 . A 180° square wave control method for a brushless DC motor according to an embodiment of the present invention includes the following steps:

[0029] Step S1: collect and control the input voltage U of the inverter of the brushless DC motor in real time dc and the three-phase phase current i of the brushless DC motor a, b, c three-phase a i b and i c , and obtain the actual speed ω and rotor position of the brushless DC motor.

[0030] Among them, the input voltage U dc , phase current i a i b and i c Sampling can be done using a sampling resistor or other sensor. The rotational speed can be measured by sensors such as encoders, or can be estimated based on voltage and current. There are also many ways to obtain the rotor position. For example, the continuous rotor position can be obtained by sensors such as absolute encoders, or the co...

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Abstract

The invention discloses a brushless DC motor 180-degree square wave control method and module and a converter. The control method comprises the following steps of obtaining an inverter input voltage Udc, phase currents ia, ib and ic of the brushless DC motor, an actual rotational speed omega and a rotor position; calculating a given torque current I* according to omega and a given rotational speed omega*; calculating three-phase given phase currents i*a, i*b and i*c of the motor according to the I* and the rotor position; calculating three-phase phase voltages U*a, U*b and U*c of the motor according to i*a, i*b and i*c and ia, ib and ic; calculating the three-phase opposite potential ea, eb and ec of the motor according to the rotor position and omega; adding U*a, U*b and U*c to ea, eb and ec respectively to obtain the compensated phase voltages Ua, Ub and Uc; calculating a duty ratio of a three-phase SPVWM (Space Vector Pulse Width Modulation) signal input to the inverter according to Udc and Ua, Ub and Uc. The brushless DC motor 180-degree square wave control method and module and the converter can achieve the effect that the waveform of the current of every phase is a square wave under the condition that three-phase windings of the brushless DC motor stator work simultaneously.

Description

technical field [0001] The invention relates to the control technology of a brushless direct current motor. Background technique [0002] With the advantages of simple structure and high efficiency, brushless DC motor has received great attention in recent years, and its application has become more and more extensive. Brushless DC motors usually adopt a 120° control method. In this control method, only two phases work at a certain moment, while the other phase is suspended. Different from general AC motors, since the brushless DC motors only work in two phases at the same time, the SVPWM modulation, which has been widely used in AC motor control, cannot be used. In addition, when implementing sensorless control of brushless DC motors, a terminal voltage detection circuit is usually required to detect the terminal voltage of the suspended phase. According to the measured terminal voltage, the back EMF zero crossing point can be obtained, and then the commutation position can...

Claims

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Application Information

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IPC IPC(8): H02P6/06H02P27/06
Inventor 李柏松陈伟金辛海
Owner SHANGHAI STEP ELECTRIC
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