Alternating-current servo flux-weakening speed-regulating method

A technology of field-weakening speed regulation and AC servo, which is applied in the direction of AC motor control, generator control, electronic commutation motor control, etc. It can solve the problems of dynamic response and control accuracy that cannot reach performance, and achieves the improvement of fast response performance, The effect of improving control accuracy and avoiding parameter drift

Active Publication Date: 2014-04-30
NANJING ESTUN AUTOMATION CO LTD
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Problems solved by technology

Therefore, the system cannot achieve satisfactory perfor

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  • Alternating-current servo flux-weakening speed-regulating method
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  • Alternating-current servo flux-weakening speed-regulating method

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Since the voltage and current of the motor and the inverter are limited, the terminal voltage and stator current of the motor cannot exceed the limit value u when the motor is running. smax i smax , the voltage and current limit equations are shown in formula (1) and formula (2) respectively:

[0019] (L d i d +ψ f ) 2 +(L q i q ) 2 ≤(u smax / ω r ) 2 (1)

[0020] i d 2 + i q 2 ≤ i s max 2 - - - ( 2 )

[0021] Among them, ω r is the rotational speed, ψ f is the flux linkage, L d , L q is the direct and quadrature axis inductance, i d i...

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Abstract

The invention discloses an alternating-current servo flux-weakening speed-regulating method. The method includes the steps that flux linkages corresponding to all motor temperature are measured; direct-axis inductance and quadrature-axis inductance which correspond to different torque are measured at base speed; a voltage limit equation and a torque equation are solved according to a Newton iteration method to obtain given values of a stator direct-axis current and a stator quadrature-axis current, and a torque-rotating speed table in which different temperature, different torque and different rotating speed correspond is formulated; according to the motor temperature, the corresponding temperature section of the torque-rotating speed table is selected, and then the given values of the direct-axis current and the quadrature-axis current are determined according to torque reference values and actual feedback rotating speed. Reference values of the direct-axis current and the quadrature-axis current are obtained at the same time according to requirements of actual working conditions, and the rapid response performance of a system is improved. Meanwhile, due to the fact that changes of the quadrature-axis inductance along with the torque and changes of the flux linkages along with the temperature in a motor are considered for formulating different torque-rotating speed tables, influence of parameter drifts caused by changes of the operation state of the motor is avoided, and the control accuracy of the system is improved.

Description

technical field [0001] The invention relates to a method for field-weakening speed regulation of an AC servo, in particular to performing field-weakening speed regulation on an AC servo in consideration of motor parameters changing with the running state of the motor, and belongs to the field of industrial automation control. Background technique [0002] At present, servo systems are widely used in industries such as material feeding, robotics, and injection molding. These applications require the servo system to be able to output constant torque below the base speed and increase speed with constant power above the base speed. As the motor speed increases, the back EMF of the motor will increase, which will cause the stator terminal voltage to be greater than the bus voltage, thereby causing the saturation of the current regulator. In order to obtain a wider speed range, the servo system usually adopts field-weakening control technology. [0003] In the above-mentioned appl...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P25/02
Inventor 孙园园齐丹丹徐正华吴波
Owner NANJING ESTUN AUTOMATION CO LTD
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