Control method of induction motor

A technology of induction motor and control method, which is applied to AC motor control, starter of single multi-phase induction motor, DC motor speed/torque control, etc. , complex circuit structure, etc.

Active Publication Date: 2005-10-05
FUJI ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the VVVF inverter 2 has a complicated circuit structure compared to a general-purpose VVVF inverter that outputs only an AC voltage of a required frequency and voltage.
In addition, switching circuit 3, AC choke 6, timing control circuit 7, etc. are required, Figure 9 The overall structure of the circuit shown is also complex
[0014] In addition, the inrush current from the VVVF inverter 2 to the induction motor 4 is suppressed by the AC choke 6 , but at this time, the rotation speed of the induction motor 4 fluctuates, and this fluctuation may be undesirable for the load 5
[0015] Moreover, since the induction motor 4, which requires a very large driving torque when starting the ab

Method used

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  • Control method of induction motor
  • Control method of induction motor
  • Control method of induction motor

Examples

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Example Embodiment

[0042] figure 1 It is a circuit configuration diagram showing the first embodiment of the control method of the induction motor of the present invention, and Figure 9 Components of the prior art shown having the same function are given the same reference numerals.

[0043] that is figure 1 In the shown circuit structure, in addition to the commercial power supply 1 and the load 5 , it also includes: a VVVF inverter 8 , an induction motor 9 with delta-connected primary coils, an electromagnetic relay 10 , and a closed circuit 11 of the electromagnetic relay 10 . The VVVF inverter 8 includes an inverter main circuit 81 and an inverter control circuit 82 . The inverter main circuit 81 converts the AC voltage of the commercial power supply 1 into a DC voltage with a diode rectifier and a smoothing capacitor, and connects an antiparallel circuit of transistors and diodes that convert the DC voltage into an AC voltage in a bridge. The inverter control circuit 82 has: a current ...

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Abstract

A control method of an induction motor suitable for an induction motor requiring a very large driving torque at the time of starting or acceleration of a textile machine, or the like, wherein a variable voltage variable frequency (VVVF) inverter (8) supplying power to the primary winding of the induction motor (9) increases its output voltage and output frequency after start while keeping the output current from the inverter lower than a specified current limit level, lowers only the output voltage of the VVVF inverter (8) down to a specified voltage set level after finishing acceleration of the induction motor (9), and then supplies an AC voltage corresponding to the frequency set level and the voltage set level continuously from the VVVF inverter (8) to the induction motor (9).

Description

technical field [0001] In particular, the present invention relates to a control method of an induction motor used as a power source of an industrial machine such as a textile machine that requires a very large driving torque for starting. Background technique [0002] Conventionally, as such an induction motor control method, first, the induction motor is connected to a commercial power source to start, and after the motor reaches approximately a normal rotation speed, the induction motor is disconnected from the commercial power source, and instead, it is connected to an optional The output of the variable-voltage variable-frequency inverter that sets the frequency (for example, refer to Patent Document 1). [0003] However, with respect to the problems of the induction motor control method of the above-mentioned Patent Document 1, etc., based on the following Figure 9 A circuit configuration diagram showing a conventional induction motor control method will be described....

Claims

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Application Information

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IPC IPC(8): H02P1/26H02P1/28H02P1/30
CPCH02P1/28H02P1/30H02P27/06
Inventor 高木靖久石田一郎高野敏雄高岛淳
Owner FUJI ELECTRIC CO LTD
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