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A brushless DC motor controlling method

A technology of DC motor and control method, which is applied in the direction of electronic commutation motor control, single motor speed/torque control, control system, etc. , The effect of reducing torque ripple

Inactive Publication Date: 2006-01-04
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, if the load on the BLDC motor changes, there is a high probability that the timing of voltage application to the stator windings will not be properly synchronized with the rotor position
In this case, due to the overcurrent supplied to the motor, the overcurrent protection device operates and cannot work normally; or due to severe torque fluctuations, it is difficult to perform correct zero-cross point detection of the back electromotive force, resulting in a sensorless operation mode. Conversion failed for

Method used

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  • A brushless DC motor controlling method
  • A brushless DC motor controlling method
  • A brushless DC motor controlling method

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Embodiment Construction

[0018] Below, refer to the attached figure 1 ~ attached Figure 7 Preferred embodiments of the present invention will be described in detail.

[0019] figure 1 It is a block diagram showing the control device of the brushless DC motor according to the embodiment of the present invention. Such as figure 1 As shown, the power conversion device composed of a converter (converter) 104, a capacitor 108 and an inverter (inverter) 106 converts the AC power provided by the AC power supply device 102 into a pulsed 3-phase AC power supply to the brushless DC motor 110. The position detection unit 112 acquires rotor position information from the three-phase AC power supply (U, V, W) supplied to the brushless DC motor 110 by the inverter 106 to generate a position detection signal 118 . The position detection signal 118 of the position detection part 112 is supplied to the control part 114, and the inverter control signal 120 is generated based on this position detection signal 118. ...

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Abstract

The present invention provides a control method of a brushless direct current motor, which prevents from providing the brushless direct current motor with over large current at a brushless direct current motor initial actuating stage, so as to switch to a no-sensor operation mode stably. The phase steering of a phase current is processed at a regulated phase steering moment during the synchronous acceleration of the brushless direct current motor; a phase current application moment that the volume of the phase current supplied to the brushless direct current motor is more than a preset value is detected, and the moment that voltage is supplied to a stator winding corresponding to a rotating position of a rotor is controlled according to the time from the phase steering moment to the phase current application moment.

Description

technical field [0001] The present invention relates to a control method of a motor, in particular to a control method of a sensorless operation mode of a brushless DC motor (brushless DC motor). Background technique [0002] A brushless DC motor uses a commutation circuit composed of switching elements to replace mechanical elements such as brushes and commutators. The characteristics of this brushless DC motor are: no replacement of brushes due to wear and tear, and low electromagnetic interference and driving noise. [0003] A brushless DC motor receives power from a power converter that converts commercial AC power into pulsed multi-phase AC power (usually 3-phase). The controller for controlling the speed of the brushless DC motor controls the rotational speed of the brushless DC motor based on phase current information of a multi-phase AC power supply supplied to the brushless DC motor by the power conversion device and rotor position and speed information. The contr...

Claims

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Application Information

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IPC IPC(8): H02P6/18H02P6/20H02P6/06H02P6/08H02P6/16H02P6/21
CPCH02P6/181H02P6/182H02P6/142H02P6/15
Inventor 李光云李尚泽
Owner SAMSUNG ELECTRONICS CO LTD
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