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Brushless continuous current dynamo off-phase control method based on rotational speed error

A technology of brushed DC motor and control method, which is applied in the direction of torque ripple control and electronic commutator, can solve the problems that the technology has not yet been reported, and the technical research of turning off the phase is little, so as to weaken the low-speed commutation The effect of torque ripple

Inactive Publication Date: 2018-11-30
夏怀琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, there are very few technical researches on controlling the shut-off phase 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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  • Brushless continuous current dynamo off-phase control method based on rotational speed error

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Embodiment Construction

[0016] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] like figure 1 As shown, the present invention provides a method for controlling the shutdown phase of a brushless DC motor based on a rotational speed error, comprising the following steps:

[0018] Step 1. Determine the shutdown power tube in the three-phase full-bridge inverter during the commutation process of the brushless DC motor;

[0019] Step 2. Record the rotational speed Sa of the brushless DC motor before commutation;

[0020] Step 3. Record the rotational speed Sb of the brushless DC motor during the commutation process;

[0021] Step 4. Judging whether |Sa-Sb| is greater than 0.05|Sa| during the commutation process;

[0022] Step 5. If |Sa-Sb| is greater than 0.05|Sa|, turn on the power tube in the same bridge arm as the off power tube in the three-phase full-bridge inverter;

[0023] Step 6. I...

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Abstract

The invention discloses a brushless continuous current dynamo off-phase control method based on a rotational speed error. The control method comprises the following steps that a turn-off power tube ina three-phase full-bridge inverter during commutation of a brushless continuous current dynamo is determined; the brushless continuous current dynamo speed S before commutation is recorded; the brushless continuous current dynamo speed S in commutation is recorded; if the absolute value of S minus S is greater than that of S in the process of commutation, a power tube of the three-phase full-bridge inverter with the same bridge arm of the turn-off power tube is turned on; and if the absolute value of S minus S is not greater than the absolute value of S in the processof commutation, the power tube of the three-phase full-bridge inverter with the same bridge arm of the turn-off power tube is turned off. In this way, the aim of reducing the low speed commutation torque ripple of the brushless continuous current dynamo is achieved.

Description

technical field [0001] The invention belongs to the field of brushless direct current motor control, and relates to a brushless direct current motor, in particular to a brushless direct current motor shutdown phase control method based on rotational speed error. 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] The commutation torque pulsation generated during the commutation of the brushless DC motor 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 off-phase is too large. During the phase...

Claims

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Application Information

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IPC IPC(8): H02P6/14H02P6/10
CPCH02P6/10H02P6/14
Inventor 夏怀琴
Owner 夏怀琴
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