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Determining commutation position for a sensorless permanent magnet brushless motor at low or zero speed using an asymmetric drive pattern

A technology of undriven and driven windings, applied in electronic commutator, electronically commutated motor control, AC motor control, etc.

Active Publication Date: 2014-05-07
CIRRUS LOGIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] 6-step commutation sequence results in one electrical turn

Method used

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  • Determining commutation position for a sensorless permanent magnet brushless motor at low or zero speed using an asymmetric drive pattern
  • Determining commutation position for a sensorless permanent magnet brushless motor at low or zero speed using an asymmetric drive pattern
  • Determining commutation position for a sensorless permanent magnet brushless motor at low or zero speed using an asymmetric drive pattern

Examples

Experimental program
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Embodiment Construction

[0035] Figure 6 is a block diagram of a motor control system 110 at a three-phase power stage 116 for a sensorless brushless permanent magnet DC motor 30 according to a first exemplary embodiment of the present invention. The motor control system 110 includes a controller unit 160 having a control signal generator 112 , a memory device 162 , a processing unit 164 , a signal acquisition device 166 and an analog-to-digital converter 170 . Control signal generator 112 feeds six inputs into gate driver 114 . Gate driver 114 , which may be powered by an independent power supply (not shown), controls six MOSFET switches 168 in power stage 116 . The operation of the switch determines the current from the supply V pwr Flow passes through stator windings 36 , 38 , 40 in electric machine 30 .

[0036] Voltage sensing circuit 118 and current sensing circuit 120 are used for closed loop control of the motor. The power stage 116 has 6 switches grouped in pairs. Each switch pair is co...

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Abstract

A system is disclosed for controlling motor switching in a sensorless BLDC motor having a set of three stator windings. A controller unit includes a control signal generator, a memory device, a processing unit, a signal acquisition device, and an analog-to-digital converter. A power stage having a plurality of switches receives a control signal from the control signal generator and a power signal from a power source. The power stage drives two windings of the set of three stator windings with an asymmetric pulse width modulation signal and leaves one stator of the three stator windings undriven. The processing unit acquires a demodulated measured voltage on the undriven winding. The processing unit also communicates with the power stage to change which two windings of the three stator windings are driven when the demodulated measured voltage surpasses a threshold.

Description

[0001] cross reference [0002] This application is a continuation-in-part of U.S. Application Serial No. 13 / 800,327, filed March 13, 2013, entitled "Circuit and Method for Sensorless Control of a Permanent Magnet Brushless Motor During Start-up," and this application Claims the benefit of U.S. Provisional Application No. 61 / 651,736, filed May 25, 2012, entitled "Circuit and Method for Sensorless Control of a Brushless Motor During Start-up," which is incorporated by reference in its entirety way incorporated into this article. technical field [0003] The present invention relates generally to motor controllers, and more particularly to systems and methods for sensorless control of permanent magnet brushless motors during start-up. Background technique [0004] Sensored brushless motor technology is well known and beneficial for minimal defect control and reliable rotation at low speeds. A sensored system has one or more sensors that are in continuous communication with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18H02P27/08
CPCH02P6/183H02P6/185
Inventor 杰森·威廉·劳伦斯马尔科·约翰·科博伊希斯蒂芬·詹姆斯·桑切斯约翰·L·梅兰森米罗斯拉夫·奥利亚恰
Owner CIRRUS LOGIC INC
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