Electricity: motive power systems – Switched reluctance motor commutation control
Reexamination Certificate
2001-06-08
2002-09-10
Masih, Karen (Department: 2837)
Electricity: motive power systems
Switched reluctance motor commutation control
C318S132000, C318S434000, C318S265000
Reexamination Certificate
active
06448726
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an electronically commutated motor. Numerous such motors are known.
For such motors it is desirable that they run with a low noise level during operation.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a novel electronically commutated motor.
According to the invention, this object is solved by a motor comprising an arrangement for detecting values of the motor current, which surpass a preset threshold value, and for generating a first signal upon surpassing this threshold value, further comprising an arrangement for determining rotational speed values, which surpass a preset rotational speed, and for generating a second signal upon surpassing the predetermined rotational speed, and comprising an arrangement for combining the first and second signals for generating a combined signal, which acts substantially without temporal delay on a semiconductor control member controlling the motor current and during its action reduces this motor current to a value which is greater than zero. Such a motor makes possible, on the one hand, a fast acceleration and, on the other hand, a smooth running at its operational rotational speed because, as a result of the current limitation that is active then, current peaks are effectively suppressed and this very efficiently lowers the noise level of such a motor.
REFERENCES:
patent: 3799136 (1974-03-01), Korteling
patent: 4734627 (1988-03-01), Koerner
patent: 5550446 (1996-08-01), Schlager et al.
patent: 6051944 (2000-04-01), Doemen
patent: 6307338 (2001-10-01), Kuner et al.
patent: 2001/0003412 (2001-06-01), Schmider et al.
patent: 2001/0004194 (2001-06-01), Schmider et al.
Lukenich Stefan
Schmider Fritz
Masih Karen
Papst-Motoren GmbH & Co. KG
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