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Flux-weakening control device and method for DC offset sinusoidal current motor

A sinusoidal current, DC bias technology, used in motor generator control, electronic commutation motor control, control of electromechanical transmission devices, etc., can solve problems such as poor output torque capability in the weak field, high-speed wide-range operation, etc.

Active Publication Date: 2018-01-23
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a field weakening control device and method for a DC bias sinusoidal current motor, thereby solving the problem of poor output torque capability in the field weakening interval and the inability to Technical Problems of High Speed ​​and Wide Range Operation

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  • Flux-weakening control device and method for DC offset sinusoidal current motor
  • Flux-weakening control device and method for DC offset sinusoidal current motor
  • Flux-weakening control device and method for DC offset sinusoidal current motor

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Embodiment 1

[0084] according to image 3 For the device shown, a simulation model is built in the MATLAB / SIMULINK environment, and the motor parameters are shown in Table 1:

[0085] Table 1 Main design parameters of DC bias sinusoidal current motor

[0086] parameter

[0087] When the effective value of the motor armature current is 19A, it is the rated working state of the motor. At this time, the current-speed waveforms of the d-axis, q-axis, and 0-axis are as follows Figure 4 As shown, as the speed increases, the 0-axis current of the motor gradually increases, while the d-axis current gradually decreases from 0, and the q-axis current gradually decreases. d axis, q axis, 0 axis current press Figure 4 When the curves shown are matched, the motor can output the maximum torque at different speeds; the waveform of the maximum output torque of the motor at different speeds changing with the speed is as follows Figure 5 Shown. Compared with the traditional field weakening algorithm that k...

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Abstract

The invention discloses a flux-weakening control device and method for a DC offset sinusoidal current motor. The device comprises a speed regulator, a current distributor, a d-axis current regulator,a q-axis current regulator, a 0-axis current regulator, a first given voltage phase shift module, a second given voltage phase shift module, a first pulse width regulator, a second pulse width regulator, a converter, the DC offset sinusoidal current motor, a speed sensor and a rotating coordinate transformation module. Composite counter electromotive force of the motor is kept constant at a maximum value of terminal voltage of the motor according to a given value of armature current and a rotating speed feedback value of the motor; and meanwhile, a composite value of the armature current of the motor is smaller than or equal to a rated value, and the composite value of the armature current is kept constant at the maximum value of the armature current of the motor, thereby obtaining the given values of d-axis current, q-axis current and 0-axis current. Therefore, the torque output capability of the DC offset sinusoidal current motor in a flux-weakening range is effectively improved, andthe target of high-speed and wide-range operation of the DC offset sinusoidal current motor is achieved.

Description

Technical field [0001] The invention belongs to the field of AC motors and drive control, and more particularly relates to a field weakening control device and method for DC bias sinusoidal current motors. Background technique [0002] Permanent magnet motors have the advantages of high power density, high efficiency, and high power factor. However, the cost of permanent magnet motors is relatively high; and the main air gap magnetic field of permanent magnet motors is generated by permanent magnets, which is difficult to adjust during the operation of the motor, which affects the speed adjustment range of the motor. Traditional permanent magnet motors mostly use vector control algorithms based on partitioned control. The constant torque area is below the rated speed; the constant power area is above the rated speed. In this interval, the d-axis current is used for field weakening control. However, when entering the deep field weakening zone, only the voltage limit of the windin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/22
Inventor 曲荣海于子翔孔武斌贾少锋李大伟
Owner HUAZHONG UNIV OF SCI & TECH
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