Brushless direct current motor position detection method, control device and electric tool

A technology of rotor position detection and brushed DC motor, which is applied in low-speed motor control, electronic commutation motor control, control system, etc., and can solve problems such as inaccurate timing of commutation

Active Publication Date: 2018-12-07
POSITEC POWER TOOLS (SUZHOU) CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is how to improve the inaccurate commutation timing of the traditional brushless DC motor with...

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  • Brushless direct current motor position detection method, control device and electric tool
  • Brushless direct current motor position detection method, control device and electric tool
  • Brushless direct current motor position detection method, control device and electric tool

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Embodiment Construction

[0099]In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0100] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terminology used herein in the description of the invention is for the purpose of describing specific embodiments only, and is not intended to limit the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of the a...

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Abstract

The present invention relates to a brushless direct current motor position detection method, a control device and an electric tool. The brushless direct current motor configured to control a sensorless to have three phases (A, B, C). The method comprises the following steps of: applying a first direction pulse at first time and a second direction pulse at second time in order for the A phase of the brushless direct current motor to obtain a bus current value Ia when the first direction pulse is applied to the A phase; repeating the operations mentioned above for the B phase and the C phase toobtain a bus current value Ib when the first direction pulse is applied to the B phase and a bus current value Ic when the first direction pulse is applied to the C phase; and comparing the sizes of the Ia, the Ib and the Ic to obtain an initial position of a rotor. The brushless direct current motor position detection method, the control device and the electric tool employ a pulse method to detect the position of the rotor at a position of rest, and commutation can be performed according to the position of the rotor to improve the accuracy of the commutation so as to improve the successfullystarting probability.

Description

technical field [0001] The invention relates to the technical field of mechatronics, in particular to a method for detecting the rotor position of a brushless DC motor, a control device and an electric tool. Background technique [0002] The brushless DC motor is composed of a motor body and a driver. It is a typical mechatronic product. It has the advantages of good speed regulation performance, small size, and high efficiency. It has been widely used in many fields. The position sensor plays a very important role in the normal operation of the brushless DC motor. It provides basic commutation information for the motor, but the signal of the position sensor is easily interfered in some high-precision and complex environments, and increases the cost and motor structure. Therefore, the study of brushless DC motors without position sensors has become one of the hot spots in the field of brushless DC motors. [0003] In the control of the brushless DC motor, the key is to dete...

Claims

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Application Information

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IPC IPC(8): H02P6/18H02P6/182H02P23/03
CPCH02P6/18H02P6/182H02P23/03Y02P80/10
Inventor 张传兵朱行张海波
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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