Generator-motor for vehicle

Details Generator-motor for vehicle Generator-motor for vehicle

2002-04-03

2004-03-09

Tamai, Karl (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S261100, C310S262000, C310S156530

Reexamination Certificate

active

06703744

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application 2001-122909, filed Apr. 20, 2001, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a generator-motor for a vehicle.
2. Description of the Related Art
Recently, a proposal to substitute a generator-motor for a starter motor has been presented, because such a generator-motor functions not only as a starter motor but also as a generator. In addition, it can recover kinetic energy while a vehicle is braking and also assist the engine with torque while the vehicle is accelerated.
An interior permanent magnet type synchronous machine is well known as a motor generator that is simple in structure and generates a large torque at a high efficiency. Such an interior permanent magnet type synchronous machine is comprised of a rotor having a rotor core and a plurality of permanent magnets and a stator having a multi-phase armature winding. The rotor core has a plurality of auxiliary pole portions disposed between the permanent magnets. Each auxiliary pole has a circumferential width that is about the same as a circumferential width of the tooth of the stator core in order to increase the average output torque. In other words, the ratio of the circumferential width of the auxiliary pole portion to the circumferential width of the tooth is larger than 0.85.
However, the output torque of such an interior permanent magnet type synchronous machine changes with the starting position of the rotor relative to the stator thereof when it is operated as a motor. Therefore, the size of the synchronous machine has to be large enough to start the engine even if the rotor stops at a position where the output torque is at a minimum. Thus, it is difficult to use a small-sized interior permanent magnet type synchronous machine for a starter.
SUMMARY OF THE INVENTION
Therefore, the present invention has been made in view of the above problems.
It is a main object of the invention to provide a compact generator-motor that can be used as an engine starter motor.
Another object of the invention is to provide an improved compact interior permanent magnet type synchronous machine whose minimum torque curve is comparatively high and flat.
According to a feature of the invention, a generator motor is comprised of a stator having teeth and slots and a rotor having a rotor core and permanent magnets. The rotor core has a plurality of axially extending through-holes to accommodate the permanent magnets and a plurality of auxiliary pole portions disposed between the through holes. Each auxiliary pole has a circumferential width that is 30%-55% of a circumferential width of the tooth. It is preferable that each auxiliary pole has a circumferential width that is 38%-50% of a circumferential width of each tooth.


REFERENCES:
patent: 4139790 (1979-02-01), Steen
patent: 4922152 (1990-05-01), Gleghorn et al.
patent: 5038065 (1991-08-01), Matsubayashi et al.
patent: 5097166 (1992-03-01), Mikulic
patent: 5170083 (1992-12-01), Burgbacher
patent: 5268603 (1993-12-01), Even
patent: 5287518 (1994-02-01), Miller et al.
patent: 5369325 (1994-11-01), Nagate et al.
patent: 5519275 (1996-05-01), Scott et al.
patent: 5655485 (1997-08-01), Kusase et al.
patent: 5672926 (1997-09-01), Brandes et al.
patent: 5679995 (1997-10-01), Nagate et al.
patent: 5705917 (1998-01-01), Scott et al.
patent: 5744895 (1998-04-01), Seguchi et al.
patent: 5838085 (1998-11-01), Roesel et al.
patent: 5864191 (1999-01-01), Nagate et al.
patent: 5929611 (1999-07-01), Scott et al.
patent: 5936322 (1999-08-01), Yamaguchi et al.
patent: 5962944 (1999-10-01), Narita et al.
patent: 5969451 (1999-10-01), Lyons et al.
patent: 6008559 (1999-12-01), Asano et al.
patent: 6104118 (2000-08-01), Kanazawa et al.
patent: 6118194 (2000-09-01), Kawamura
patent: 6133659 (2000-10-01), Rao
patent: 6144132 (2000-11-01), Nashiki
patent: 6147428 (2000-11-01), Takezawa et al.
patent: 6177745 (2001-01-01), Narita et al.
patent: 6218753 (2001-04-01), Asano et al.
patent: 6294854 (2001-09-01), Grosspietsch et al.
patent: 6329734 (2001-12-01), Takahashi et al.
patent: 6342745 (2002-01-01), Sakai et al.
patent: 6353275 (2002-03-01), Nishiyama et al.
patent: 6373155 (2002-04-01), Shimizu et al.
patent: 6429566 (2002-08-01), Kuwahara
patent: 6452302 (2002-09-01), Tajima et al.
patent: 2001/0028201 (2001-10-01), Miyashita et al.
patent: 2002/0089251 (2002-07-01), Tajima et al.
patent: 2002/0175583 (2002-11-01), Kikuchi et al.
patent: A 3-103059 (1991-04-01), None
patent: 06245429 (1994-09-01), None

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