AC motor control method and control device

Details AC motor control method and control device AC motor control method and control device

2008-01-08

2008-01-08

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S798000, C318S811000, C318S803000, C318S812000, C363S037000

Reexamination Certificate

active

10575966

ABSTRACT:
It is possible to control the DC intermediate voltage to be constant without using a device for returning regenerative resistance or regenerative energy to a power source and to safely continue operation of an AC motor even if an instantaneous stop occurs. An AC motor control method includes: a step of detecting a stop of AC power supply by power supply stop detection means arranged in a power converter, a step of outputting a speed reduction start instruction to an inverter unit, a step of calculating a speed reduction rate1from a target value and a detection value of the DC intermediate voltage so that the DC intermediate voltage is to be constant during speed reduction of the AC motor, a step of calculating a speed reduction rate2from the change ratio of the DC intermediate voltage, a step of calculating a torque instruction so that speed reduction follows the speed reduction time, a step of changing the torque limit value of the motor side and the regenerative side according to the DC intermediate voltage detection value, a step of terminating the speed reduction when voltage returns to the voltage before the power supply stop detection or the DC intermediate voltage increases during speed reduction, and a step of storing the output frequency before the power supply stop detection when returning to the normal control.

REFERENCES:
patent: 5705904 (1998-01-01), Kuriyama
patent: 5808428 (1998-09-01), Ito et al.
patent: 6437997 (2002-08-01), Inarida et al.
patent: 6762947 (2004-07-01), Hammond
patent: 6815924 (2004-11-01), Iura et al.
patent: 6924618 (2005-08-01), Matsushiro et al.
patent: 7005825 (2006-02-01), Eguchi
patent: 7042181 (2006-05-01), Nagakura
patent: 7091690 (2006-08-01), Oka et al.
patent: 7227330 (2007-06-01), Swamy et al.
patent: 2007/0029963 (2007-02-01), Iura et al.
patent: 57009278 (1982-01-01), None
patent: 60005791 (1985-01-01), None
patent: 8-242594 (1996-09-01), None
patent: 9-247990 (1997-09-01), None
patent: 11-150998 (1999-06-01), None
patent: 11-308894 (1999-11-01), None
patent: 2003-219689 (2003-07-01), None

Affiliated with

Also associated with

Rating

AC motor control method and control device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with AC motor control method and control device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and AC motor control method and control device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3904991