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Identifying a position of a brushless DC motor

A technology of brushless motors and identification circuits, which is applied in the direction of electronic commutation motor control, electric/magnetic devices to transmit sensing components, measuring devices, etc., which can solve unreliable problems

Inactive Publication Date: 2016-03-23
MARVELL ASIA PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the back EMF of an electric machine can be weak and unreliable for use in determining rotor position at rotor startup

Method used

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  • Identifying a position of a brushless DC motor
  • Identifying a position of a brushless DC motor
  • Identifying a position of a brushless DC motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] figure 1 A multi-phase brushless DC motor system 100 according to an embodiment is shown. The brushless DC motor system 100 includes a motor driver circuit 1-110 and a multi-phase brushless motor 1-120. The motor driver circuit 1-110 includes various devices and components for driving (eg, electrically commutating) the motor 120, such as a commutation logic component configured to drive the motor 1-120, an external power field effect transistor (FET), Temperature monitoring components, starting components, etc. In an embodiment, the motor driver circuit 1-110 includes a microprocessor that executes computer program instructions from a non-transitory computer readable medium.

[0030] In the embodiment, the multi-phase brushless DC motor system 100 is a three-phase brushless motor system, and the multi-phase brushless motor 1-120 is a three-phase brushless motor. In another embodiment, the multi-phase brushless DC motor system 100 is a two-phase brushless motor system, a...

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PUM

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Abstract

A method for identifying a position of a multi-phase brushless motor includes applying a plurality of detection voltage pulses to the motor, each detection voltage pulse corresponding to a respective driving phase of the motor, measuring a time period associated with a current reaching a predetermined current limit for each applied detection voltage pulse, and identifying a driving phase associated with a shortest time period for the current to reach the predetermined current limit.

Description

[0001] Cross references to related applications [0002] This disclosure claims the benefits of U.S. Provisional Application No. 61 / 880,311 filed on September 20, 2013, the entire content of which is incorporated herein by reference. Background technique [0003] The background description provided herein is for the purpose of the context of the present disclosure as it is generally presented. To the extent of the work described in this background art section, the work of the currently signed inventor and aspects of the description that may not otherwise be considered prior art at the time of submission are neither expressly nor implicitly acknowledged As a prior art that contradicts the present disclosure. [0004] The brushless DC (direct current) motor includes a multi-phase motor (hereinafter referred to as a motor) and a motor driver circuit. In operation, the motor driver circuit transforms the DC power source into multiple AC (alternating current) signals for driving the mot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18
CPCH02P6/183G01D5/14G01D5/243G01D5/244
Inventor 王艺超梁富灵
Owner MARVELL ASIA PTE LTD