A method for starting a Hall-less brushless DC motor
A brushless DC motor and back electromotive force technology, applied in the direction of starting devices, etc., can solve the problems such as the failure of the Hallless brushless DC motor to start and the slow starting speed of the Hallless brushless DC motor, so as to improve the environmental adaptability, The effect of improving start-up speed and reducing cost
Active Publication Date: 2019-08-20
NINGBO UNIV
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Problems solved by technology
This starting method adopts the frequency-up method to increase the rotor speed, but it takes a certain time to increase the frequency, so when the external load is too large or too small, the starting speed of the Hallless brushless DC motor is slow, especially when the external load is too large or too small. When the external load is too large, the brushless DC motor without Hall may not be able to start
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[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0026] A starting method for a Hallless brushless DC motor proposed by the present invention, its overall realization block diagram is as follows figure 1 As shown, it includes the following steps:
[0027] ① Determine the initial position of the rotor of the Hallless brushless DC motor when it is stationary. The specific process is:
[0028] ①_1. Connect the DC power supply to the Hallless brushless DC motor.
[0029] ①_2. Make the A, B, and C three-phase windings of the Hallless brushless DC motor energized sequentially under the same voltage, and measure the energizing current of each phase winding when energized.
[0030] In this specific embodiment, the voltage of each phase winding in step ①_2 is less than or equal to 1 / 10 of the operating voltage of the Hallless brushless DC motor, such as the voltage of each phase winding is just equ...
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The invention discloses a Hall-free brushless direct current motor starting method. According to the invention, the method comprises: enabling the A-phase, B-phase and C-phase windings of the Hall-free brushless direct current motor to be on successively; detecting the on-current across each phase winding to determine the initial position of the rotor of the Hall-free brushless direct motor when it is still; then, through the detection of the counter-electromotive force waves at the suspension end part of the suspension winding to determine whether the starting process for the Hall-free brushless direct current motor is completed or not; and if the process has yet to be completed, then, while gradually increasing the externally applied voltage, increasing the phase changing frequency. The starting method of the invention enables the Hall-free brushless direct current motor to be started quickly, and even if the external load is large, it is still possible to enable the Hall-free brushless direct current motor to be started normally and quickly.
Description
technical field [0001] The invention relates to a motor starting technology, in particular to a starting method of a Hallless brushless DC motor. Background technique [0002] In today's industrial field in China, brushless DC motors (Brushless DC Motor, BLDC) have gradually replaced brushed DC motors by virtue of their incomparable advantages, occupying an increasingly important position. The advantages of brushless DC motors are mainly that the excitation device is omitted, the structure of the motor is simplified, the weight of the motor is reduced, and it has the characteristics of high reliability, high efficiency and excellent speed regulation performance. It also has advantages in reducing losses and saving energy. It has obvious advantages, and its conversion efficiency is more than ten percentage points higher than that of brushed DC motors on average, so it has become an important development direction of new motors. Among the equipment imported from abroad, it is...
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IPC IPC(8): H02P6/20
Inventor 陈翔俞建定袁飞周彬彬
Owner NINGBO UNIV