A fast start-up method of brushless DC motor based on short-duration pulse without position sensor

Abstract

The invention relates to a brushless DC motor rapid starting method based on short-time pulse of a position sensorless controller, and provides the brushless DC motor rapid starting method based on short-time pulse of the position sensorless controller. A mode of simultaneously acquiring three-phase back electromotive force (BEMF), an average value of the values of the three-phase BEMF is taken as a central point voltage and is compared with the voltage of a current suspension phase, meanwhile, a calculation error is corrected by estimating time of next commutation to carry out commutation operation, so that rapid starting is fulfilled, and the algorithm is simple in implementation process, small in calculation quantity and high in transportability. The method has the technical effects that a central point voltage value is not needed to be directly acquired or a central point waveform is not needed to directly measured, and the detection flow is reduced; the algorithm is simple to implement, and is small in calculation quantity and high in transportability and weak in dependence on a motor parameter; and the system development cost can be reduced, and the system debugging period is saved.

Description

technical field [0001] The invention discloses a method for quickly starting a brushless DC motor based on a short-time pulse. The invention relates to a technology for quickly starting a brushless DC motor, in particular to a brushless motor for an inertial load that is directly accelerated by a short-time pulse without relying on a position sensor. DC motor quick start method. Background technique [0002] Brushless DC motors have been widely used in modern production and life due to their good torque and speed characteristics. Whether the start-up of the brushless DC motor is successful or not directly determines the control effect of the entire operation stage of the motor. Such as figure 1 As shown, the commonly used brushless DC motor starting methods are as follows. [0003] Position sensor starting method: rely on the position sensors HA, HB, and HC installed in the motor body 13 to detect the current position of the motor rotor, and perform commutation operation ...

AI Technical Summary

Problems solved by technology

[0008] Although the center point calculation method has improved to a certain extent compared with the position sensor starting method, the time to calculate the center point through the BEMF value in sequence generally has a large error, which is easy to cause continuous error accumulation during the acceleration process, and at the same time, it is more dependent on the motor parameters. Strong, the robustness of the method is poor

[0009] The phase current Clark transformation method requires a large number of vector transformations, the calculation process is cumbersome, and the implementation process is relatively difficult, which highlights certain limitations for general engineering applications

[0010] To sum up, the three commonly used brushless DC motor starting methods have their own disadvantages and are not suitable for a wide range of application requirements.

Images