Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
ELECTRIC MOTOR HAVING ROTOR CAPABLE OF CONFINING MAGNETIC FLUX
Document Type and Number:
WIPO Patent Application WO/2002/035683
Kind Code:
A1
Abstract:
An electric motor comprising stator (20) having a plurality of annularly equispaced stator salient poles (24), four sets of permanent magnets (12a) disposed with an equal pitch and opposed to the inner peripheral sides of the salient poles (24), and a rotor (10) in which the permanent magnets (12a) are supported for rotation along the inner peripheries of the salient poles (24). The magnetic flux from the permanent magnets (12a) is allowed to flow through a rotor ring (Mp). An excitation controller (30) feeds the excitation coils (24b) for the salient poles (24) with an excitation current to synchronously drive the rotor (10). When the excitation coils (24b) are in the non-excited state, the rotor (10) is free to rotate substantially without load along the inner peripheries of the stator salient poles (24) by confinement of the magnetic flux; the startability is good.

Inventors:
KAWAI TERUO (JP)
Application Number:
PCT/JP2000/007438
Publication Date:
May 02, 2002
Filing Date:
October 24, 2000
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NIHON RIKEN CO LTD (JP)
COSMOS CO LTD (JP)
KAWAI TERUO (JP)
International Classes:
H02K21/16; H02K29/03; (IPC1-7): H02K1/27
Foreign References:
JPH11220846A1999-08-10
JPS4848116U1973-06-23
JPH09182331A1997-07-11
JP2000197292A2000-07-14
Attorney, Agent or Firm:
Isshiki, Kensuke (Shinbashi 2-chome Minato-ku, Tokyo, JP)
Download PDF: