Electromagnetic drive system with integrated path signal generat

Details Electromagnetic drive system with integrated path signal generat Electromagnetic drive system with integrated path signal generat

1999-04-22

2000-03-14

Nappi, Robert E.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318135, G05B 1100

Patent

active

060377399

ABSTRACT:
An electromagnetic drive system having an integrated position signal generation for use by the drive windings for the movement and power generation and as a measuring system for determining the position of the movable partial system of the drive with respect to the stationary system, so that separate measuring systems are generated. The drive system including a stationary drive coil system of a direct current linear motor, having at least two identical partial coils which are serially connected with each other induced with a pulse length modulated control signal with a constant pulse frequency and a constant circuit voltage. For the position measurement, the impedance change in the partial coils of the coil system is picked up in accordance with the principle of an inductive voltage splitter by establishing the slopes of the electric voltage paths on the partial coils at a constant point in time after switching over the pulse length modulated control signal. By using the corresponding drive circuit for position sensing, this arrangement permits the structure of very compact positioning systems without any additional measuring systems.

REFERENCES:
patent: 4352048 (1982-09-01), Schulze
patent: 5257014 (1993-10-01), Zimmermann
patent: 5434459 (1995-07-01), Pinkerton
patent: 5729067 (1998-03-01), Janutka
patent: 5783915 (1998-07-01), Shida et al.
Ogasawara, et al.; IEEE Transactions On Industry Applications, vol. 27, No. 5, An Approach to Position Sensorless Drive for Brushless dc Motors, (Sep./Oct. 1991).
Kulkarni, et al.; IEEE Transactions On Industry Applications, vol. 28, No. 1, A Novel Position Sensor Elimination Technique for the Interior Permanent-Magnet Synchronous Motor Drive, (Jan./Feb. 1992).

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