The Control Method of Motor Realizing Multi-rotating Speed

Abstract

The present invention provides a motor control method for realizing multi-speed, including a motor controller and a motor coil. The method changes the back electromotive force of the motor coil and controls the motor to work by changing the series-parallel structure between the motor coils of each phase. Different speeds; the motor can have multiple characteristics, so that the motor can have more than two gears without the need for a mechanical transmission, thereby saving costs.

Description

technical field [0001] The invention relates to a control method for a motor, in particular to a control method for realizing multi-rotational speeds of the motor. Background technique [0002] Due to the advantages of small size, light weight, high efficiency and adjustable speed, brushless DC motors are widely used at present, but they have obvious disadvantages: the high-efficiency operating range is small, which makes brushless DC motors in the field of large speed changes The comprehensive efficiency used in the motor is not high, so the adaptability of the DC brushless motor is poor. [0003] In the prior art, in order to solve the technical problem of the high-efficiency operation range of the DC brushless motor, a mechanical multi-speed transmission is generally used, but the mechanical transmission is large in size, structurally loaded, and expensive to use. Therefore, people have gradually proposed a direct Transform the coils of brushless motors, such as the tech...

AI Technical Summary

Problems solved by technology

[0002] Due to the advantages of small size, light weight, high efficiency and adjustable speed, brushless DC motors are widely used at present, but they have obvious disadvantages: the high-efficiency operating range is small, which makes brushless DC motors in the field of large speed changes The comprehensive efficiency used in the motor is not high, so the adaptability of the DC brushless motor is poor

[0003] In the prior art, in order to solve the technical problem of the high-efficiency operation range of the DC brushless motor, a mechanical multi-speed transmission is generally used, but the mechanical transmission is large in size, structurally loaded, and expensive to use. Therefore, people have gradually proposed a direct Transform the coils of brushless motors, such as the technologies disclosed in patent documents with application numbers 2009200191450, 20131036612768, and 201310048749. These technologies mainly tap or segment the coils of each phase, but this method can only achieve double speed. However, there is still a low utilization rate of the coil, and more importantly, the range of the maximum multiple of the back electromotive force of the coil in the prior art is small, so that the motor with a relatively single characteristic can be obtained.

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