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Voltage orienting frequency conversion controller for open loop non-speed sensor

A speed sensorless, variable frequency controller technology, used in electronic commutation motor control, motor generator control, control of electromechanical brakes, etc., can solve the problems of light load oscillation and poor motor load capacity, and achieve smooth operation and output. The effect of torque enhancement and light-load oscillation suppression

Inactive Publication Date: 2010-07-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides an open-loop speed sensorless voltage-oriented frequency conversion controller to overcome the problem that the motor is under load due to the influence of factors such as stator resistance voltage drop, slip frequency and dead zone when the traditional constant voltage-frequency ratio control is running at low speed. Poor capacity and problems with oscillations at light loads

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  • Voltage orienting frequency conversion controller for open loop non-speed sensor
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  • Voltage orienting frequency conversion controller for open loop non-speed sensor

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specific Embodiment approach 1

[0023] Specific implementation mode one: the following combination Figure 1 to Figure 3 This embodiment will be specifically described. The controller of the present invention is made up of the following units;

[0024] Current sensor 1: to detect the phase current on the stator of the induction motor IM through the current sensor 1;

[0025] Vector coordinate transformation unit 2: to realize the directional coordinate transformation of the induction motor IM stator voltage, and decompose the detected stator current into instantaneous active current i d and instantaneous reactive current i q ;

[0026] PI regulator 3: set the given reactive current i q * and instantaneous reactive current i q subtracted as the input of PI regulator 3, the output voltage of the PI regulator V q As the q-axis voltage given value of SVPWM unit 12, to utilize PI regulator 3 to instantaneous reactive current i q Feedback control is performed so that the reactive current on the stator of t...

specific Embodiment approach 2

[0061] Specific implementation mode two: the following combination Figure 4 to Figure 9 A specific example is given. This embodiment adopts controller of the present invention and an inverter and an induction motor, and the parameter of this motor is as follows: rated voltage: 380V, rated current 15.4A, rated power is 7.5Kw, rated speed is 1440r / min, rated frequency It is 50Hz, the stator resistance is 0.611Ω, the rotor resistance is 0.434Ω, the excitation inductance is 105.6mH, and the stator leakage inductance is 2.32mH. Figure 4 It is the current waveform of the motor when it is no-load. From the figure, it can be seen that the motor current is stable and there is no oscillation phenomenon when it is no-load. Figure 5 It is the motor current waveform when starting with full load. It can be seen from the figure that the motor has a strong load capacity and quick response, and the current in the second cycle reaches a stable operating current. Figure 6 It is the motor c...

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Abstract

The invention relates to a voltage orientation frequency-vary controller of an opening-ring no-speed sensor, and a controlling technology of a sensing motor, which overcomes the problems of the poor loaded capacity and the light loaded oscillation of a motor caused by the influences of the factors of the voltage decrease of a stator resistor, rotating difference frequencies, dead areas, and the like in the low-speed running of the traditional constant-voltage frequency-ratio control. The voltage orientation frequency-vary controller is composed of the following units, i.e. a current sensor, avector coordinate changing unit, a PI adjustor, a calculating unit of voltage boosting amount, a sliding-frequency calculating unit, a frequency adder, a first operation unit, a second operation unit, a third operation unit, a fourth operation unit, a fifth operation unit, a sixth operation unit and a SVPWM unit. The PI adjustor is used for controlling the no-power current, and the problem of thelight-loaded oscillation of the sensing motor is effectively inhibited. The product of the power current and the motor stator resistance is used as the voltage boosting in loading, the loaded capacity of the motor is obviously improved, and the low-speed performance of the motor is greatly improved.

Description

technical field [0001] The invention relates to an induction motor control technology, in particular to a speed sensorless stator voltage-oriented controller using a constant voltage-frequency ratio (VVVF) control algorithm. Background technique [0002] With the continuous development and progress of industrial and agricultural production, people have higher and higher requirements for speed regulation. According to the dynamic model of the induction motor, the vector control of the induction motor decouples the motor current according to the field orientation, obtains the torque current component and the excitation current component, and then controls them respectively. It can get fast speed response and run very smoothly. However, the performance of vector control has a great relationship with the accuracy of motor parameters. In practical applications, online identification of motor parameters is required, and the control algorithm is very complicated. [0003] Compare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/04H02P21/28H02P27/08
Inventor 陈伟于泳杨荣峰王高林徐殿国贵献国杨明
Owner HARBIN INST OF TECH
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