Title:
INVERTER APPARATUS FOR MOTOR DRIVE
Document Type and Number:
Japanese Patent JP3930260
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an inverter apparatus for motor drive that simply controls starting voltage and frequency, can miniaturize an inverter as compared with the motor that is supported by a friction type bearing, and at the same time does not require the need for increasing the support force of a magnetic bearing in starting as compared with the normal case.
SOLUTION: The inverter apparatus 1 for motor drive comprises a rectifying circuit 1, a voltage variable circuit 2, a DC-AC conversion circuit 3, a control circuit 4, a frequency control circuit 5, starting voltage setting equipment 6, starting frequency setting equipment 7, and storages 11 and 12, controls the voltage variable circuit 2 and DC-AC conversion circuit 3 by the control circuit 4, and outputs power having a specific voltage and frequency to a motor M where the rotor is supported by a magnetic bearing. Also, in the inverter apparatus 10 for motor drive, a current detection circuit 9 is provided, and the control circuit 4 has a function for comparing an actual starting current value detected by the current detection circuit 9 with a preset setting starting current value, and determining an optimum starting voltage value or starting frequency value according to the comparison result.
Inventors:
Shunji Ochiai
Tomoyuki Yamazaki
Toshiharu Nakazawa
Tomoyuki Yamazaki
Toshiharu Nakazawa
Application Number:
JP2001076666A
Publication Date:
June 13, 2007
Filing Date:
March 16, 2001
Export Citation:
Assignee:
Ebara Corporation
International Classes:
H02P1/28; H02P1/30; H02M7/48; H02P27/06; (IPC1-7): H02P1/30; H02M7/48; H02P7/63
Domestic Patent References:
| JP2215996A | ||||
| JP9037586A |
Attorney, Agent or Firm:
Takashi Kumagai
Yu Takagi
Yu Takagi