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Ac motor decelerating method and inverter device

An AC motor, voltage inverter technology, applied in the direction of AC motor acceleration/deceleration control, AC motor control, motor/generator/inverter limiter, etc., can solve the problem of increasing loss and increasing the excitation current of induction motor 308 And other issues

Active Publication Date: 2007-05-09
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, by increasing the output voltage of the inverter circuit 303 at the time of deceleration, the excitation current to the induction motor 308 is increased, and the loss on the winding of the induction motor 308 is increased.

Method used

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  • Ac motor decelerating method and inverter device
  • Ac motor decelerating method and inverter device
  • Ac motor decelerating method and inverter device

Examples

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Embodiment 1

[0266] FIG. 1 shows a block diagram of a first embodiment of an inverter device to which the method of the present invention is applied, and FIG. 2 shows an example of a time constant adjusting section. The control device for an induction motor according to this embodiment includes an AC power source 1, a frequency converter section 2, a capacitor 3, an inverter section 4, an AC motor 5, a DC bus voltage detector 6, a current detector 7, a current converter 8, Time constant adjustment section 9, filter section 10, voltage correction section 11, frequency / phase converter 12, PWM calculation section 13, and switch SW1. The frequency converter section 2 of the inverter device rectifies the AC voltage of the AC power source 1, thereby converting it into a DC voltage. The capacitor 3 smoothes the DC voltage converted by the frequency converter section 2 . The inverter section 4 controls the power elements by PWM control, thereby converting the direct current into alternating curre...

Embodiment 2

[0270] FIG. 1 shows a block diagram of a second embodiment of an inverter device to which the method of the present invention is applied, and FIG. 4 shows an example of a gain adjustment section. The control device for an induction motor according to this embodiment includes an AC power source 1, a frequency converter section 2, a capacitor 3, an inverter section 4, an AC motor 5, a DC bus voltage detector 6, a current detector 7, a current converter 8, filter section 10, voltage correction section 11, frequency / phase converter 12, PWM calculation section 13; gain adjustment section 14, multiplier 15, and switch SW2. The frequency converter section 2 of the inverter device rectifies the AC voltage of the AC power source 1, thereby converting it into a DC voltage. The capacitor 3 smoothes the DC voltage converted by the frequency converter section 2 . The inverter section 4 controls the power elements using PWM control to thereby convert direct current into alternating current...

Embodiment 3

[0274] Fig. 5 shows a block diagram of a third embodiment of an inverter device applying the method of the present invention, and Fig. 6 shows an example of a gain calculator. The control device for an induction motor according to this embodiment includes an AC power source 1, a frequency converter section 2, a capacitor 3, an inverter section 4, an AC motor 5, a DC bus voltage detector 6, a current detector 7, a current converter 8, Filter section 10, voltage correction section 11, frequency / phase converter 12, PWM calculation section 13, gain calculator 16, multiplier 15, and switch SW3. The frequency converter section 2 of the inverter device rectifies the AC voltage of the AC power source 1 to thereby convert it into a DC voltage. The capacitor 3 smoothes the DC voltage converted by the frequency converter section 2 . The inverter section 4 controls the power elements by PWM control to thereby convert direct current into alternating current having an arbitrary frequency a...

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PUM

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Abstract

An AC motor can be decelerated in as a short time as possible by means of an inverter and the current is controlled below a predetermined value so that the inverter does not stop because of an overcurrent or the AC motor does not fail due to burnout even if the AC motor is liable to be magnetically saturated. A method and device for driving an AC motor by means of a voltage inverter having therein a voltage correcting section for correcting a given voltage command by using the value obtained by passing a DC bus voltage detected value through a primary delay filter. The AC motor is decelerated in an overexcited state by increasing the time constant of the primary delay filter above the time constant in the normal control state. The current flowing through the AC motor is monitored and the time constant is adjusted according to the current flowing through the AC motor. Therefore, the AC motor is decelerated without causing a failure and the deceleration time can be shortened.

Description

technical field [0001] The present invention relates to a deceleration method of an AC motor, which decelerates the AC motor by increasing the loss of the AC motor in an inverter device, and in particular, relates to preventing the deceleration due to excessive magnetic saturation when applied to an AC motor prone to magnetic saturation. A deceleration method and device for causing an inverter device to stop working abnormally due to problems such as electric current, or burning an AC motor. Background technique [0002] As a prior art, proposals have been made regarding voltage-type inverter devices for increasing losses by increasing the terminal voltage of a motor at the time of braking. (For example, refer to Patent Reference 1). [0003] 13 shows a block diagram of a prior art inverter device for converting commercial power into direct current through a rectification section 101, rectifying the voltage, smoothing the rectified voltage through a capacitor 102, and input...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P3/18H02P27/06H02P21/36H02P23/20H02P27/08
CPCH02P3/18H02P27/06
Inventor 井浦英昭平松和彦泽村光次郎
Owner YASKAWA DENKI KK
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