Speed regulation method for direct current brushless motor

A brushless DC motor, speed adjustment technology, applied in the direction of speed/torque control of a single motor, can solve the problems of constant power speed regulation, difficulty, size change, etc., achieve effective electromagnetic energy, overcome constant torque speed regulation , Improve work efficiency and performance

Inactive Publication Date: 2017-01-04
WUXI ECOVI TECH
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AI Technical Summary

Problems solved by technology

[0002] At present, because permanent magnet motors rely on permanent magnets to generate a magnetic field, the magnetic field is constant, and it is difficult to change its size.
Therefore, for a long time, brushless DC motors have been considered to be able to perform constant torque speed regulation below the base speed (rated speed), but not to perform constant power speed regulation above the base speed.

Method used

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  • Speed regulation method for direct current brushless motor

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Embodiment Construction

[0011] The present invention is described in detail by taking a two-pole three-phase DC brushless motor as an example.

[0012] The potential balance equation of each phase winding of the motor is:

[0013] u=e+iR

[0014] Among them, i is the current of each phase winding, R is the resistance of each phase winding, and iR is the resistance voltage drop of each phase winding. This value is relatively small when the motor is in normal operation, u is the applied voltage; e is each phase winding The back electromotive force can be expressed by the following formula:

[0015] e=L(di / dt)+NBlv

[0016] Among them, L is the inductance of each phase winding, L(di / dt) is the "inductance potential" generated by each phase winding due to current changes; N is the total number of wires in each phase winding, B is the air gap flux density, and the magnetic field is composed of permanent The magnet is generated, l is the length of the wire, v is the relative motion speed of the wire (eq...

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Abstract

The invention discloses a speed regulation method for a direct current brushless motor. Before a front edge of a rotor magnetic pole of a motor enters a central position of a stator winding slot or before a back edge of the stator magnetic pole quits from the central position of the stator winding slot, a stator winding is switched on or switched off in advance; the initial lead is in direct proportion to the rotating speed of the motor; and in a const-power speed regulation process at a speed greater than a base speed, a relatively high rotating speed is corresponding to a relatively high initial lead, and the limit value is equal to a half pitch.

Description

technical field [0001] The invention relates to a speed regulation method of a motor, in particular to a speed regulation of a DC brushless motor. Background technique [0002] At present, because permanent magnet motors rely on permanent magnets to generate a magnetic field, the magnetic field is constant, and it is difficult to change its size. Therefore, for a long time, brushless DC motors have been considered to be able to perform constant torque speed regulation below the base speed (rated speed), but not to perform constant power speed regulation above the base speed. Contents of the invention [0003] The purpose of the present invention is to provide an effective, practical and convenient constant power speed regulation method above the base speed for the DC brushless DC motor, so as to expand the speed regulation range and application occasions of the motor. Improve the working efficiency and running performance of the motor. [0004] The invention discloses a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08
Inventor 董振青
Owner WUXI ECOVI TECH
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