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Device for driving three-phase semiwave driven brushless electric machine

A brushless motor, three-phase technology, applied in the field of start-up systems, can solve the problems of enlarged circuit size and susceptibility to noise.

Inactive Publication Date: 2002-12-25
关邦夫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the converted voltage is very small, from tens of millivolts to hundreds of millivolts, the disadvantage of this voltage is that it is susceptible to noise
In addition, since various circuits, such as counters for measuring time, AD converters, or comparators for comparing voltages, need to compare changes in current rise time constants, there is a disadvantage that the size of the circuit is enlarged.

Method used

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  • Device for driving three-phase semiwave driven brushless electric machine
  • Device for driving three-phase semiwave driven brushless electric machine
  • Device for driving three-phase semiwave driven brushless electric machine

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Embodiment Construction

[0040] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0041] Fig. 2 is a block diagram showing an example of a circuit configuration for driving a three-phase half-wave driven brushless motor according to the present invention.

[0042] Reference symbols "U", "V" and "W" denote stator windings consisting of coils wound on the stator core, and "Q1", "Q2" and "Q3" denote output transistors for supplying drive current to all The stator windings U, V and W are described, while "ZD1", "ZD2" and "ZD3" represent Zener diodes for clamping the output voltage. Also, in a circuit for driving a three-phase half-wave driven brushless motor, a center tap commonly connected to one terminal of each stator winding U, V and W is connected to a power supply terminal Vcc of a power supply.

[0043] In addition, reference numeral "11" in FIG. 2 denotes a clock generator for generating a required clock signal to a circuit to be...

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Abstract

A device for driving a three-phase half-wave brushless motor, which has a simple structure, is not easily affected by noise, etc., and does not need a counter or an AD converter, etc., can accurately determine the stop position of the motor rotor to the stator, and determine the The first phase of the stator winding where the flow begins and turns the rotor correctly in the desired direction when the motor is driven. This device applies a short pulse current to any two-phase stator winding of the three-phase stator winding, so that the rotor is not driven when the rotor stops, and the rotor is determined by the recoil time difference caused by the sensitive change of the inductance according to the difference of the rotor stop position. the stop position.

Description

technical field [0001] The present invention relates to a control technology for driving a three-phase half-wave driven brushless motor, and in particular to a technology effective in a detection system of a motor stop position and a starting system when the motor starts to rotate. For example, the present invention relates to an effective technique in a main motor of a device requiring low manufacturing cost, such as a portable AV (audio-visual) device. Background technique [0002] Systems for driving three-phase DC brushless motors generally have a full-wave drive system to supply current from one of the three-phase stator windings to the other two-phase stator windings and drive the brushless motor, and a half-wave drive system, It is used to provide current only to any one phase of the stator windings of each phase from a center tap, and the center tap is connected to the terminals of the three-phase stator windings and connected to the power supply terminals. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/06H02P6/08H02P6/18H02P6/182H02P6/21
CPCH02P6/08H02P6/185H02P6/182
Inventor 关邦夫
Owner 关邦夫