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Frequency-changing speed regulation driver by supplying power to both ends of windings of Three-phase asynchronous motor

A speed-regulating drive, asynchronous motor technology, applied in the direction of DC motor speed/torque control, electrical components, control systems, etc., can solve the problems of reducing the withstand voltage of switching devices, not describing the implementation scheme, adding switching devices, etc.

Inactive Publication Date: 2004-07-28
TSINGHUA UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The paper mentions that he used a control circuit and system based on the theory of direct torque control, but does not describe the implementation
[0018] At present, there are several main problems faced by high-voltage frequency conversion speed regulation technology: the requirements for the withstand voltage of switching devices, the requirements for the number of switching devices, and the requirements for auxiliary devices (such as capacitors, diodes, and phase-shifting transformers). Among them, the degree of solution to the problems in these aspects is often trade-off. For example, in order to reduce the withstand voltage of switching devices, the multi-level scheme is adopted, which increases the number and devices of switching devices, and these factors are directly related to the cost and reliability of the final implementation

Method used

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  • Frequency-changing speed regulation driver by supplying power to both ends of windings of Three-phase asynchronous motor
  • Frequency-changing speed regulation driver by supplying power to both ends of windings of Three-phase asynchronous motor
  • Frequency-changing speed regulation driver by supplying power to both ends of windings of Three-phase asynchronous motor

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Embodiment Construction

[0040] The realization of the present invention is very simple. Common three-phase asynchronous motors provide all six terminals at both ends of the three-phase windings, so as to facilitate the change of the Δ / Y connection.

[0041] Both ends of the winding can be connected to two-level bridge arms, such as Figure 5 , can also be connected to a multi-level bridge arm, such as Image 6 , or a one-phase inverter connected to the H bridge; the inverter bridge arms connected to both ends of the winding can be symmetrical or asymmetrical, and the DC bus voltage of the inverter can be equal or unequal.

[0042] The rectifier bridge adopts a three-phase bridge rectifier circuit composed of diodes, such as Figure 7 shown.

[0043] In this topological structure, the open-loop VVVF control of the motor can be realized, and the closed-loop high-performance control such as vector control and direct torque control can also be realized. The simplest control method can directly generat...

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Abstract

This invention relates to a frequency-varying speed-regulating driver of three-phase asynchronous motor, which is characterized by the supply of power at each end of three-phase stator winding of the asynchronous motor with a group of frequency-varying drive main circuits and the use of digital circuit composed of micro-processor to form PWM control signals to unifiably control two groups of mutually independent main circuits. An inversion circuit is composed of high-performance field-control switch device and rectifier circuit is composed of noncontrolled rectifier bridge. The controller circuit generates pulse-width modulation signal frequency fixed at a value in the range of 1KHz-20KHz unchanged with the output frequency. This invented driver is used in speed modulation of high voltage large volume motor with no high voltage withstand requirement on needed elements.

Description

technical field [0001] The invention relates to a frequency conversion speed regulation drive device of a three-phase asynchronous motor, belonging to the field of frequency conversion speed regulation of a three-phase asynchronous motor. Background technique [0002] The frequency conversion speed regulation technology of AC motors using power electronic switching devices has been developed for decades. The new field-controlled high-speed switching devices represented by IGBT (InsulateGate Bipolar Transistor) have greatly promoted the AC-DC-AC Topology for the development of voltage conversion devices. Its basic circuit structure is as figure 1 . [0003] Among them, the control circuit composed of electronic devices controls the switch main circuit composed of power electronic devices in real time, and various frequency conversion speed regulation systems with different performance characteristics can be obtained. With the development of microelectronics technology, dig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
Inventor 李永东刘永衡侯轩
Owner TSINGHUA UNIV
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