PERMANENT MAGNET TYPE MOTOR AND COMPRESSOR COMPRISING IT

Title:

PERMANENT MAGNET TYPE MOTOR AND COMPRESSOR COMPRISING IT

Document Type and Number:

WIPO Patent Application WO/2003/079516

Kind Code:

A1

Abstract:

In a permanent magnet type motor the stator of which incorporates a rotator wherein permanent magnets are so buried as to be arrayed circumferentially in the magnet inserting section of a yoke, each magnet is divided into a center magnet located at the center in the width direction of the magnet inserting section and an end magnet located at an end of the magnet inserting section, the coercive force of the end magnet is made larger than that of the center magnet, and the flux density of the center magnet is made larger than that of the end magnet. Since the coercive force of the end magnet located in the easy-to-demagnetize side by a reverse magnetic field produced by a stator current, the demagnetization of the magnets is prevented as the whole. Since the flux density of the center magnet located on the difficult-to-demagnetize side is large, the maximum torque and efficiency of the motor are enhanced by this large magnetic flux.

Inventors:

KOJIMA HIROAKI (JP)
KAGEYAMA JUN (JP)
YAMAGIWA AKIO (JP)

Application Number:

PCT/JP2003/002281

Publication Date:

September 25, 2003

Filing Date:

February 27, 2003

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
KOJIMA HIROAKI (JP)
KAGEYAMA JUN (JP)
YAMAGIWA AKIO (JP)

International Classes:

H02K1/27; H02K7/14; (IPC1-7): H02K1/27

Foreign References:

JPH11355985A	1999-12-24
JPH05236686A	1993-09-10
JP2001178045A	2001-06-29

Other References: