Claw pole motor

Details Claw pole motor Claw pole motor

2000-02-16

2001-08-28

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S254100, C310S049030

Reexamination Certificate

active

06281616

ABSTRACT:

This application is a national phase application under § 371 of PCT/DE98/02001 filed Jul. 17, 1998.
FIELD OF THE INVENTION
The invention relates to a claw pole motor, and in particular to an electronically commutated claw pole motor.
BACKGROUND
Motors of this kind are often extremely small, and can have, for example, an outside diameter of less than 2 cm. They are preferably used to drive small fans for direct cooling of the processor in computers, and since only very limited space is available on a computer circuit board, a low overall height for such motors is desirable; their operation must nevertheless be absolutely reliable.
A motor known from EP 766 370 A2 and corresponding U.S. Pat. No. 5,831,359, JESKE, has a relatively large overall height, since in it, the interaction of the permanent magnet of the external rotor and the claw pole arrangement of the interior stator must generate on the rotor a magnetic pull which ensures that the shaft is pressed with sufficient force onto the axial bearing. For this purpose, in this motor the rotor and stator must be highly offset in the axial direction.
It is therefore an object of the invention to make available a new claw pole motor, in particular a subminiature motor, that is suitable, for example, as a fan drive system for cooling microprocessors.
SUMMARY OF THE INVENTION
According to the invention, this object is achieved by asymmetrical shaping of the claw poles, to thereby displace the magnetic symmetry planes of the stator and rotor. It thereby becomes possible either to increase the axial magnetic pull acting on the rotor, or to reduce the overall height of the motor, or also to take a combination of these measures.
Further details and advantageous developments of the invention are evident from the exemplary embodiments—which are not to be understood in any way as a limitation of the invention—that are described below.


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