Control method and device for increasing DC brushless motor speed

A technology of brushless DC motor and control device, applied in excitation or armature current control, etc., can solve the problems of complicated process, increased cost, complicated circuit, etc., achieve high energy utilization rate, high utilization rate, and increase the maximum input voltage Effect

Inactive Publication Date: 2007-08-29
金华市绿源电动车有限公司 +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The winding of this motor has two sets of motor access wires, and the process becomes complicated
In order to be able to switch the controller used, the main control circuit of the controller uses two sets of drive motor main circuits, the circuit is complicated, and the cost is also increased

Method used

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  • Control method and device for increasing DC brushless motor speed
  • Control method and device for increasing DC brushless motor speed

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Embodiment Construction

[0026] The control method for improving the speed of the DC brushless motor in this embodiment is: detect the operating speed, operating current and operating voltage of the motor in real time, and control the motor to work in the following states respectively:

[0027] State 1, the working current of the motor is greater than the set value, and the output voltage of the battery is used as the power supply voltage of the motor;

[0028] State 2, the battery voltage is lower than the set value, and the output voltage of the battery is kept as the power supply voltage of the motor;

[0029] State 3, when the working current of the motor is not greater than the set value and the battery voltage is not less than the set value, when the voltage signal on the speed control handle is detected to be the maximum, the voltage of the battery pack is converted to obtain the converted voltage V2. The converted voltage V2 obtained by transforming the group voltage is superimposed on the out...

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Abstract

Detecting rotation speed of motor, working current and voltage, the invention controls motor to operate at following states: (1) working current of motor larger than setting value, using voltage output from accumulator as voltage for supplying to motor; (2) voltage of battery smaller than setting value, keeping voltage output from accumulator as voltage for supplying to motor; (3) working current of motor not larger than setting value, voltage of battery not smaller than setting value; when voltage signal detected from rotating handle for speed adjustment is in maximum, the disclosed method converts voltage of accumulator storage battery to obtain voltage of transformation V2, and using summation of V2 and output voltage V1 from accumulator storage battery as working voltage of motor. Thus, rotation speed of motor reaches to (V1+V2)/V1 time of former rotation speed.

Description

technical field [0001] The invention relates to a control method and device for a DC motor of an electric vehicle, more specifically a method and a device for increasing the maximum operating speed of a DC motor without changing the parameters of the motor. Background technique [0002] At present, electric bicycles generally use brushless DC motors, which are powered by three or four 12-volt batteries connected in series. The voltage applied to the DC motor is controlled by the controller to control the motor speed. When the motor speed selected by the electric vehicle is constant, its speed is proportional to the voltage applied to the motor winding within the range of use, so the voltage of the battery pack equipped on the electric vehicle limits the speed of the motor of the electric vehicle. The current electric bicycle motor basically rotates in the range of 300 to 450 RPM, which is suitable for electric vehicles with different wheel diameters. When motors with the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P7/06
Inventor 何茂彬倪捷王建国胡继红肖军
Owner 金华市绿源电动车有限公司
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