Storage battery-powered multiphase permanent magnet brushless DC motor

A DC motor and permanent magnet brushless technology, which is applied in the field of electric motors, can solve the problem of shortening the mileage of one charge and achieve the effects of extending the mileage of one charge, improving the utilization rate and prolonging the discharge time

Inactive Publication Date: 2012-09-05
刘大椿 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For electric vehicles, high current discharge will rapidly shorten the mileage of a single charge

Method used

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  • Storage battery-powered multiphase permanent magnet brushless DC motor
  • Storage battery-powered multiphase permanent magnet brushless DC motor
  • Storage battery-powered multiphase permanent magnet brushless DC motor

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] When the torque constant Kt of a 3-phase permanent magnet brushless DC motor is constant, increasing the electromagnetic torque will inevitably increase the motor phase current The increase will inevitably make the battery discharge current I DC increase, see attached figure 1 . The thin solid line in the figure is the winding phase current The thick solid line is the battery discharge current I DC . So the battery discharge current I of the 3-phase permanent magnet brushless DC motor in the 6-state working state DC The peak value is only proportional to the electromagnetic torque Te of the motor. For a dual 3-phase permanent magnet brushless DC motor, if the PWM frequency and initial phase of the dual 3-phase controller are the same, when the electromagnetic torque Te of the motor is the same, the phase current in each set o...

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Abstract

The invention relates to a storage battery-powered multiphase permanent magnet brushless DC motor for electric vehicles, which is characterized in that: the phase current I phi of a three-phase brushless DC motor is in proportion to the electromagnetic torque Te of the three-phase brushless DC motor, and the peak value and duty ratio D of the discharge current of a storage battery are equal to those of the phase current of the storage battery; when Te increases, the peak values of the phase current and the discharge current also increase proportionally, so that the storage battery discharges under high magnification, and the number of the actual discharging ampere-hour is much smaller than that of the equipment ampere-hour of the storage battery. In the invention, n independent three-phase armature windings are correspondingly connected with the output ends of n three-phase voltage-source inverting bridges; and the PWM modulation frequencies fPWMs of n three-phase voltage-source inverting bridges are the same, but the PWM initial phases of the half of the inverting bridges have a mutual 1 / 2TPWM phase shift relative to the PWM initial phase of the rest inverting bridges, and TPWM is equal to 1 / fPWM. The storage battery-powered multiphase permanent magnet brushless DC motor of the invention can extend the driving range on a single charge of the storage battery-powered electric vehicle operated under the same operating condition by 20 to 25 percent, or make the equipment capacity of the storage battery reduced to 80 to 75 percent of the original capacity when the driving range on a single charge is not changed.

Description

technical field [0001] The invention belongs to the field of torque closed-loop controlled motors, and relates to multi-phase permanent magnet brushless DC motors powered by accumulators such as electric vehicles. Background technique [0002] Electric vehicles require their drive systems to meet the requirements of various working conditions: under the conditions of starting, accelerating, climbing, and parking start of electric vehicles, the drive system needs to be able to provide 3-4 times the rated torque at medium and low speeds The peak torque; under the highest speed condition, the drive system is required to provide the equivalent torque to overcome the corresponding driving resistance at the highest speed. [0003] Electromagnetic Torque of Permanent Magnet Brushless DC Motor Where Kt is the torque constant of the permanent magnet brushless DC motor, the unit is N m / A; is the phase current of the permanent magnet brushless DC motor, A; the line back EMF of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K29/06H02K1/16H02P6/08H02P6/16
Inventor 刘大椿刘晨
Owner 刘大椿
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