Electronically commutated motor

Details Electronically commutated motor Electronically commutated motor

2000-03-24

2001-12-11

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S191000, C310S209000

Reexamination Certificate

active

06329736

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an electronically commutated motor that has a stator, carrying at least two winding phases, multiple magnet poles and grooves and a rotor, in which a defined position between the rotor and the stator can be detected by way of a position sensing device.
BACKGROUND INFORMATION
In the case of conventional electronically commutated motors of this kind, graduation of output is usually implemented by varying the electronic activation, e.g. by pulse width modulation of the power output stage of the energization device. When the power output stage is cycled, this results in additional electronic losses and thus, in a reduction in motor efficiency. Attempts have been made to graduate the output by way of special winding variants, but this results in increased manufacturing cost for of the stator.
SUMMARY OF THE INVENTION
An object of the present invention, in the case of an electronically commutated motor, is to graduate output and influence rotation speed with a simple motor configuration for the stator and with low-loss energization.
According to the invention, this object is achieved in that the magnet poles have regions that have air gaps of different heights from the rotor; and the onset times of the temporally successively occurring energization of the winding phases can be varied in terms of the position between the rotor and the stator and/or the energization durations of the winding phases.
With a winding configuration known per se it is possible, merely by way of the configuration of the magnet poles on the stator and by varying the energization time and/or energization duration, to obtain a different working characteristic curve and/or cover a large working field.
According to an embodiment, energization of the winding phases is accomplished periodically. The period duration, energization onset times and/or durations of the energization and/or the current determine the rotation speed and/or power output of the motor. In this context, for energization over the entire period of time, energization of the winding phases may occur in immediate succession; while for partial energization, activations of the winding phases can be performed with a time interval in between.
The magnet poles of the stator can form air gaps set back in stepped fashion from the rotor, or can have regions in which the air gap with respect to the rotor continuously changes.
If, according to an embodiment, the grooves alternately delimit wide magnet poles and narrow return flux poles, and for the winding phases to have subwindings, alternately nested into one another, that are each wound around only one magnet pole and change winding direction from one subwinding to another or—if the current direction is different—are wound in the same direction, the result is a winding configuration in which the winding phases do not overlap. This eliminates winding terminations at the axial ends of the stator, thus making production of the stator simpler and less expensive. The motor also requires less space and has higher efficiency.
The motor can be configured as an internal-rotor or external-rotor motor. It is advantageous in this context if the rotor is equipped with permanent magnets. The different working characteristic curves—governed by the differing height of the air gaps in the region of the magnet poles—can also be achieved with an electrically excited motor.


REFERENCES:
patent: 3873898 (1975-03-01), Muller
patent: 4554491 (1985-11-01), Plunkett
patent: 4804873 (1989-02-01), Manabu et al.
patent: 4899075 (1990-02-01), Hasebe
patent: 4900963 (1990-02-01), Amano et al.
patent: 5962938 (1999-10-01), Bobay et al.
patent: 0 040 484 (1981-11-01), None
patent: 2 636 182 (1990-03-01), None

Affiliated with

Also associated with

Rating

Electronically commutated motor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronically commutated motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronically commutated motor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2568474