Intermittent fillet control method for single-phase brushless direct-current motors

Abstract

The invention discloses an intermittent fillet control method for single-phase brushless direct-current motors, which can be used for improving the control strategies for single-phase brushless direct-current motors, thereby achieving the purpose of reducing the torque ripple and improving the operation efficiency. The method is mainly applied to the control on motors in the process of running. The principle of the process is as follows: firstly, according to a measured or designed no-load positioning torque waveform, obtaining a position having a greater positioning torque; according to the waveform, determining the power-on / off control moments of a motor; in the process of power-off control, driving the motor to rotate by the positioning torque of the motor so as to realize the control on an intermittent fillet; and when the motor detects the changes of hall signals, carrying out reversing on the motor, and continuing to run the later period in accordance with the process. According to the invention, under the condition of not changing the structure of the motor and a hardware control circuit, control strategies are optimized and implemented extremely conveniently, so that compared with the existing continuous power-on control method, the running efficiency of the motor is improved to a certain extent.

Description

technical field [0001] The invention relates to the control field of a single-phase brushless direct current motor, in particular to a control method for improving the efficiency of a single-phase brushless direct current motor. Background technique [0002] At present, there are relatively few applications of single-phase brushless DC motors in the market. The main reason is that its operating efficiency is lower compared with three-phase brushless DC motors. Simple and low cost, if the operating efficiency of the single-phase brushless DC motor is improved to a certain extent, its applicability will be greatly improved. For the existing single-phase brushless DC motors, the control methods are mainly speed closed loop, current closed loop or double closed loop structure of the outer speed loop and the inner current loop. Continuous, does not take into account the role of the detent torque during the operation of the motor. If this characteristic of the single-phase brush...

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Problems solved by technology

[0003] Determined by the structure of the single-phase brushless DC motor, there is a positioning torque when the motor rotor rotates to a certain position, and this positioning torque reaches the maximum value when the centerlines of the stator and rotor poles coincide. For loads such as fans Said that the detent torque is almost the same as the rated torque. For the existing control strategies on the market, when the motor rotates to the position where the detent torque is relatively large, the armature winding is still energized, which will cause the armature current A large peak value appears at this position, which increases the loss of the motor and aggravates the vibration of the motor

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