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A low-speed delay on-time set method for a brushless DC motor

A brushed DC motor, turn-on time technology, applied in electronic commutator, torque ripple control and other directions, can solve the problems of low-speed delay turn-on time setting technology, which is rarely researched and the technology has not been reported yet.

Inactive Publication Date: 2018-12-11
张懿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, there are very few studies on the low-speed delay turn-on time setting technology in the commutation process of brushless DC motors, and the application technology of the present invention has not yet been reported.

Method used

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  • A low-speed delay on-time set method for a brushless DC motor

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Embodiment Construction

[0015] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] Such as figure 1 As shown, a method for setting a low-speed delayed turn-on time of a brushless DC motor in the present invention includes the following steps:

[0017] Step 1. After controlling the brushless DC motor to enter the low-speed steady-state working state, determine the turn-on phase of the brushless DC motor in the commutation process, and set the initial value of the delay turn-on time of the turn-on phase to 0;

[0018] Step 2. In each commutation cycle thereafter, increase the delayed turn-on time of the turn-on phase by 1 microsecond;

[0019] Step 3. Record the rotational speed Sa of the brushless DC motor before commutation in each commutation cycle;

[0020] Step 4. Record the rotational speed Sb of the brushless DC motor during the commutation process in each commutation cycle;

[0021] ...

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Abstract

The invention discloses a low-speed delay on-time setting method for a brushless DC motor. The setting method includes setting that initial value of start-up phase delay opening time to 0 after brushless DC motor enter low-speed steady-state working state, ; in each subsequent commutation cycle, the on-phase delay on-time is incremented by one microsecond; Recording the rotational speed Sa of thebrushless DC motor before commutation of each commutation cycle; Brushless DC motor speed Sb in each commutation cycle is record; Subtracting the Sb from the Sa to obtain the rotational speed deviation Delta S of the brushless DC motor; The on-phase delay on-time corresponding to the minimum absolute value of Delta S / Sa is taken as the setting value of the low-speed delay on-time of the brushlessDC motor.

Description

technical field [0001] The invention belongs to the field of brushless direct current motor control, relates to a brushless direct current motor, in particular to a method for setting the low-speed delayed turn-on time of the brushless direct current motor. Background technique [0002] Brushless DC motors have many advantages such as simple structure, high power density, and simple control. In recent years, brushless DC motors have been increasingly widely used in industrial fields such as high-performance speed regulation systems and servo control systems. [0003] Commutation torque fluctuations generated during commutation of brushless DC motors can cause motor vibration and noise, which limits the application range of this type of motor. Taking the brushless DC motor with 120° conduction and three-phase six-state control as an example, when the low-speed brushless DC motor commutates, the current change rate of the open phase is too large. The reason is that the brushl...

Claims

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Application Information

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IPC IPC(8): H02P6/10H02P6/15
CPCH02P6/10H02P6/15
Inventor 张懿
Owner 张懿
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