Title:
INVERTER SYSTEM
Document Type and Number:
Japanese Patent JP3918148
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent over excitation if torque boost voltage is largely set to acquire high starting torque in a multipurpose inverter and the like.
SOLUTION: An induced voltage indication Em* is acquired from an inverter's primary frequency indication ω1*, then a torque boost voltage indication ΔVz* corresponding to the ω1* from a torque boost voltage indicator 8 and standard phase indication θd* from an integrator 9 are output. Exciting current Id (equivalent to no-load current) of a motor is detected by a uvw/dq exchanger 11. Deviation of exciting current limitation level indication Idmax* and exciting current detection value Id is input in a limiter process part 13, and torque boost voltage compensation amount ΔVc to change the ΔVz* is output so that the Id reaches at the Idmax* or less. The inverted ΔVz* is regarded as the lowest limiter value of the limiter process part. A last torque boost voltage indication after compensation ΔVt* is determined by adding these ΔVc and ΔVz*, and a q axis voltage indication Vq* of inverter output voltage is determined by adding these ΔVt* and Em*.
Inventors:
Keijiro Sakai
Toshiaki Okuyama
Kinya Nakatsu
Hiroyuki Tomita
Junji Kato
Sadakazu Furukawa
Toshiaki Okuyama
Kinya Nakatsu
Hiroyuki Tomita
Junji Kato
Sadakazu Furukawa
Application Number:
JP2001223066A
Publication Date:
May 23, 2007
Filing Date:
July 24, 2001
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
H02P23/00; H02P1/16; H02P21/00; H02P21/04; H02P21/22; H02P23/03; H02P23/07; H02P27/04; H02P27/08; (IPC1-7): H02P21/00; H02P7/36
Domestic Patent References:
| JP7245989A | ||||
| JP9047067A | ||||
| JP7163188A |
Attorney, Agent or Firm:
Shigeru Sasaoka
Previous Patent: LIQUID CRYSTAL DISPLAY DEVICE AND PORTABLE INFORMATION EQUIPMENT
Next Patent: DICING APPARATUS
Next Patent: DICING APPARATUS