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Patent Searching and Data


Title:
MOTOR DRIVE DEVICE AND AIR CONDITIONER
Document Type and Number:
WIPO Patent Application WO/2019/193621
Kind Code:
A1
Abstract:
By performing direct-current energization before start-up of first and second synchronous motors (7A, 7B), rotors of the synchronous motors (7A, 7B) are pulled into designated positions. In the direct-current energization, a difference between the value of a direct current flowing through the first synchronous motor (7A) and the value of a direct current flowing through the second synchronous motor (7B) is reduced. For example, d-axis currents and q-axis currents, which correspond to three-phase currents flowing through the motors (7A, 7B), are found (103A, 103B), a d-axis voltage command value that causes one having a larger absolute value out of the d-axis currents to match a d-axis current command value is found, a q-axis voltage command value that causes one having a larger absolute value out of the q-axis currents to match a q-axis current command value is found (104A, 104B, 106), and an inverter is driven using the found d-axis voltage command value and q-axis voltage command value (107, 108). Even if the initial positions of the motors are different, a sharp rise in motor current can be suppressed, thereby making it possible to reduce risks such as inverter failure and motor demagnetization.

Inventors:
SHIMIZU Yuichi (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
HATAKEYAMA Kazunori (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
UEMURA Keisuke (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
Application Number:
JP2018/014093
Publication Date:
October 10, 2019
Filing Date:
April 02, 2018
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORPORATION (7-3 Marunouchi 2-chome, Chiyoda-ku Tokyo, 10, 〒1008310, JP)
International Classes:
H02P1/54
Foreign References:
JP2008206290A2008-09-04
JP2005245058A2005-09-08
JPS4973607A1974-07-16
Attorney, Agent or Firm:
MAEDA Minoru et al. (MAEDA & YAMAGATA, Koda Bldg. 4F 16-2, Yoyogi 2-chome, Shibuya-k, Tokyo 53, 〒1510053, JP)
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