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Weak magnetic control function controlling method in brushless motor controller for electric bicycle

An electric bicycle, brushless motor technology, applied in the direction of a single motor speed/torque control, etc., can solve the problems of no weak field control, high current overload multiple requirements, endangering the safe operation of the controller, etc. The effect of increasing the maximum operating speed and improving reliability

Inactive Publication Date: 2005-08-10
上海谙乃达实业有限公司
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AI Technical Summary

Problems solved by technology

[0002] Existing brushless motor controllers for electric bicycles do not have the function of field weakening control. When the bicycle is running on normal road conditions and climbing, the load current varies greatly, and the current overload multiple of the power part of the controller is required to be high, which endangers the safety of the controller. run

Method used

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  • Weak magnetic control function controlling method in brushless motor controller for electric bicycle
  • Weak magnetic control function controlling method in brushless motor controller for electric bicycle
  • Weak magnetic control function controlling method in brushless motor controller for electric bicycle

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Embodiment Construction

[0019] attached figure 1 It is a functional block diagram of an existing brushless motor controller for electric bicycles, including peripheral circuits, a single-chip microprocessor MCU, a pre-driver and a power amplifier circuit, and these circuits are commonly used in existing brushless motor controllers for electric bicycles.

[0020] The control method for realizing the field-weakening control function in the brushless motor controller for electric bicycles of the present invention is to set a processing program in the single-chip microprocessor MCU in the controller. The main program flow of this program please refer to the attached figure 2 As shown, the loop executes the empty operation and waits for the PWM interrupt response. Once the PWM cycle ends, apply for the PWM interrupt. After the interrupt responds, it enters the PWM interrupt subroutine. The PWM interrupt subroutine Please refer to the attached image 3 , the specific steps are: a) Calculate the speed of ...

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PUM

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Abstract

A PWM interruption subroutine is built in single chip MCU of controller of brushless motor for general motor-assisted bicycle. Based on Hall signal, MCU calculates real time rotate speed of motor to determine whether a weak magnetic rotate speed point is reached. If yes, weak magnetic angle of corresponding rotate speed i.e. advanced phase change angle is calculated. Based on the said advanced phase change angle, MCU outputs relevant logic signal of advanced phase change through table look up. Then, weak magnetic control is implemented for motor through parts of preceding stage driving and power amplification. Advantages are: target of maximum speed is guaranteed without increasing cost of controller hardware; increasing designed value of moment coefficient reduces current of power part of controller effectively when bicycle climbs sloping field so as to raise service life of the controller.

Description

technical field [0001] The invention relates to a control method for a field-weakening control function, in particular to a control method for a field-weakening control function in a brushless motor controller for an electric bicycle. Background technique [0002] Existing brushless motor controllers for electric bicycles do not have the function of field weakening control. When the bicycle is running on normal road conditions and climbing, the load current varies greatly, and the current overload multiple of the power part of the controller is required to be high, which endangers the safety of the controller. run. Contents of the invention [0003] The object of the present invention is to provide a control method for the field weakening control function in the brushless motor controller for electric bicycles, so that the brushless motor controller for electric bicycles can realize the field weakening control without increasing the hardware cost. The maximum speed index ...

Claims

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Application Information

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IPC IPC(8): H02P6/08
Inventor 贡俊秦小雷须斌
Owner 上海谙乃达实业有限公司
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