Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
1999-04-07
2001-02-06
Masih, Karen (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S254100, C318S132000
Reexamination Certificate
active
06184639
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an electric motor having an integrated electronic control device.
Electric motors are known with which, for example, in machine tools carriages are driven in order to feed the carriages, for example, quickly to the machining location and then switch over to the advancing speed for machining the work piece. The electronic control device provided for rpm control is a component separate from the electric motor so that the mounting of such a drive requires considerable mounting space which is often not available.
There are also electric motors known which are of a small size and which already have an integrated electronic control device. Such motors, however, exhibit considerable moment fluctuations so that an exact rpm (revolutions per minute) control is not obtainable.
It is therefore an object of the invention to embody the aforementioned electric motor such that a very precise rpm control is possible while the motor has a small size.
SUMMARY OF THE INVENTION
This object is inventively solved forthe aforementioned electric motor by supplying the electric motor with sine-shaped currents or voltages.
The inventive electric motor is supplied with sine curve-shaped currents or voltages, and the sine commutation results in a reduction of the moment fluctuations to a minimum so that a very precise rpm control is possible in a simple manner. Furthermore, the inventive electric motor exhibits a very quiet and synchronous run for smallest rpm.
The actual value transducer for the commutation, the rpm, and also for the position of the motor shaft are advantageously in the form of linear Hall sensors which are simple and inexpensive components.
Further features of the invention will result from the further claims, the description, and the drawings.
REFERENCES:
patent: 5444479 (1995-08-01), Fernekes et al.
patent: 5821651 (1998-10-01), Fernekes et al.
patent: 5982297 (1999-11-01), Welle
Dr. Fritz Faulhaber GmbH & Co. KG
Masih Karen
Robert W. Becker & Associates
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