Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1995-08-18
1997-07-08
Ro, Bentsu
Electricity: motive power systems
Induction motor systems
Primary circuit control
318807, 318808, H02P 5408
Patent
active
056464991
ABSTRACT:
An inverter control apparatus for controlling a command frequency and a command voltage which are supplied to an inverter which then supplies AC power of a desired frequency, accordingly, to an induction motor. The inverter control apparatus receives a requested rotational speed of the motor and an actual rotational speed of the motor is obtained by detecting a frequency of a fluctuation component of a drive current supplied from the inverter to the induction motor. The difference between the requested rotational speed and the actual rotational speed represents a slip amount, which is added to the requested rotational speed to produce a command frequency. The command voltage is set to a voltage acquired when the monitored drive current is at a minimum value. Thus, the inverter control apparatus is able to maintain power consumption at the lowest possible level in response to changes in the operating environment without requiring a motor constant input or a motor speed detector, while compensating the slip ratio of the induction motor to maintain the motor speed at a target level.
REFERENCES:
patent: 4477761 (1984-10-01), Wolf
patent: 4680526 (1987-07-01), Okuyama et al.
patent: 4689543 (1987-08-01), Hucker
patent: 4780658 (1988-10-01), Koyama
patent: 5241256 (1993-08-01), Hatanaka et al.
patent: 5548199 (1996-08-01), Bidaud et al.
Green, T.C. et al., "Non-Invasive Speed Measurement of Inverter Driven Induction Motors", Oct. 7, 1990, Conference Record of the Industry Applications Society Annual Meeting, vol. 1, No. Meeting 25, pp. 395-398, Institute of Electrical and Electronics Engineers.
Azzeddine Ferrah, et al., "An FFT-Based Novel Approach to Noninvasive Speed Measurement in Induction Motor Drives", Dec. 1, 1992, IEEE Transactions on Instrumentation and Measurement, vol. 41, No. 6, pp. 797-802.
Muneaki Ishida, "Steady-State Characteristics of a Torque and Speed Control System of an Induction Motor Utilizing Rotor Slot Harmonics for Slip Frequency Sensing", IEEE Transactions on Power Electronics, No. 33, Jul. 1987, pp. 257-263.
Manfred Beck et al., "A New Method for the Calculation of the Slip Frequency for a Sensorless Speed Control of a Squirrel-Cage Induction Motor", PESC '85 Record, 24-28 Jun. 1985, pp. 678-683.
"Low Pressure Type Scroll Compressor for Air Conditioners", Sawai et al., National Technical Report, vol. 35, No. 6, Dec. 1989, Japan.
"Quieting Technique for Inverter Scroll Package Air Conditioners (Low Noise Technologies for Packaged Type Air Conditioners)" described in Reitoshi (a Japanese Journal of refrigeration), Jun. 1992.
"Third Generation Intelligent Power Modules", Mitsubishi Electric Technical Review, vol. 67, No. 9, 1993, Japan.
"A New Generation High Speed Low Loss IGBT Module", G. Majumdar et al., Proceedings of 1992 International Symposium on Power Semiconductor Devices & ICs, Tokyo, Japan.
"Micro Invertor FVR-C9S", Imamura, et al., Fuji Jiho (Japanese Magazine), vol. 67, No. 11, 1994.
"Power Electronics Nyumon (basics)", of Sakae Murayama et al. published Mar. 25, 1994 by OHM Sha Ltd, Japan.
Doyama Yoshiaki
Ito Yoshiteru
Matsui Keizo
Ogata Hideo
Watakabe Shusaku
Matsushita Electric Industrial Co.,Ltd.
Matsushita Refrigeration Company
Ro Bentsu
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