Motor driving system

A drive system, motor technology, applied in motor generator/starter, starter of a single polyphase induction motor, control system, etc., can solve the problems of rising cost and large-scale, and achieve the effect of reducing output capacity

Inactive Publication Date: 2004-11-24
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] according to image 3 In the conventional motor drive system shown, when starting the industrial machinery as the load 5, the induction motor 4 requires a large starting torque, although it is possible to flow the torque corresponding to the starting torque from the VVVF converter 2 to the induction motor 4. But at this time, the converter main circuit 21 constituting the VVVF converter 2 must also have a current rating that flows out the output current corresponding to the above-mentioned starting torque. Therefore, the rated output of the VVVF converter 2 The capacity becomes a value based on the product of the rated output voltage and the output current corresponding to the above-mentioned starting torque, and becomes, for example, several times or more than the output capacity of the VVVF converter 2 when the above-mentioned industrial machine is in operation. As a result, , there is a so-called motor drive system, that is, the VVVF converter 2 is enlarged and the cost is increased

Method used

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Embodiment Construction

[0019] figure 1 is a circuit configuration diagram showing the motor drive system of Embodiment 1 of the present invention, and image 3 Parts with the same function in the conventional example circuit are marked with the same symbols.

[0020] That is, in figure 1 In the circuit structure of the shown embodiment, in addition to the commercial power supply 1 and the load 5, it is equipped with: a converter main circuit 61 and a converter control circuit 62, which can be controlled by the converter control circuit 62. The output phase is connected to the commercial power supply 1 AC voltage variable voltage variable frequency (VVVF) converter 6, AC reactor 7, main switch circuit 8 composed of electromagnetic contactors MC1 and MC2, delta-star (Δ-Y) switch 9 , The induction motor 10 and the sequence control circuit 11 for making the primary winding in an open circuit.

[0021] Below, refer to figure 2 The waveform diagram shown to illustrate figure 1 Action of the motor ...

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Abstract

The present invention relates to a motor driving system suitable for driving induction motor with large starting torque. It is characterized by that it utilizes the commercial power supply to start to supply power to induction motor whose primary winding is connected into delta form to make the induction motor be started, after said induction motor is started, the described primary winding is converted into star connection, then the power supply is converted into the power supply by utilizing VVVF transformer of AC voltage in which the output phase and voltage phase of commercial power supply are synchronous, then the VVVF transformer can be used for providing AC voltage with voltage and frequency expected by induction motor.

Description

technical field [0001] The present invention relates to a motor drive system for driving an induction motor as a power source of industrial machinery such as a loom. Background technique [0002] image 3 It is a circuit configuration diagram showing a conventional example of such a motor drive system, 1 is a commercial power supply, 2 is a variable voltage variable frequency (VVVF) converter composed of a converter main circuit 21 and a converter control circuit 22, and 3 is an electromagnetic contactor , 4 is the induction motor, 5 is the load driven by the induction motor 4 . [0003] exist image 3 In the motor drive system shown, first, the VVVF converter 2 is started, and once the start is completed, the electromagnetic contactor 3 is turned on to start the induction motor 4 . When starting, the VVVF inverter 2 outputs an AC voltage with the lowest allowable voltage and the lowest allowable frequency by the control operation of the inverter control circuit 22, so that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/32
Inventor 高本靖久石田一郎
Owner FUJI ELECTRIC CO LTD
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