Title:
MOTOR DRIVE AND ELECTRIC COMPRESSOR AND AIR CONDITIONER FOR VEHICLE MOUNTED WITH MOTOR DRIVE
Document Type and Number:
Japanese Patent JP2005323414
Kind Code:
A
Abstract:
To provide a small and lightweight motor drive in which noise and vibration are reduced while suppressing a cost increase.
A current sensor 6 for detecting a power supply current provided between a DC power supply 1 and a switching circuit 2 is arranged to be also employed for detecting a current of a stator winding 4 in order to detect the position of a magnet rotor 5. A current flowing through the stator winding 4 of one phase is detected by shifting a conduction period in a carrier period of that phase, and a current flowing through the stator winding 4 of the other phase is detected in the other carrier period. The position of the permanent magnet rotor 5 is determined by detecting phase currents of two phases.
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Inventors:
KURAHASHI YASUFUMI
GOTO NAOMI
GOTO NAOMI
Application Number:
JP2004137083A
Publication Date:
November 17, 2005
Filing Date:
May 06, 2004
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H02P6/18; H02P6/06; H02P6/08; H02P6/182; (IPC1-7): H02P6/18
Attorney, Agent or Firm:
Fumio Iwahashi
Tomoyasu Sakaguchi
Hiroki Naito
Tomoyasu Sakaguchi
Hiroki Naito