Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1998-03-31
2000-03-07
Nappi, Robert E.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
318254, G05F 110
Patent
active
060344997
ABSTRACT:
A control system is provided for a limited angle torque motor used as a rotary position control device. A motor for which the system is intended would consist of a rotor and a stator. The system uses an analog Hall-effect sensor to sense the position of the rotor. Rather than attempting to shield the Hall-effect sensor from the influences of magnetic fields generated by the field windings in the stator during motor operation, the system allows the output signal from the Hall effect sensor to contain elements of both the angular position and the extraneous magnetic field generated by the field windings of the motor. Current feedback from a circuit which independently senses the motor current is then combined with this signal to eliminate the influence of the motor coil magnetic field. The system is applicable to a number of limited angle torque motor designs. A preferred embodiment is shown wherein a unique sandwich construction of the rotor magnets on a soft iron rotor core provides a highly linear angular position signal for the system to process. Furthermore, a means of fixturing the Hall-effect sensor within the motor end windings to facilitate the position sensing for the preferred embodiment is described. Finally, a detailed description of the electronic circuit used to implement the system in the preferred embodiment is provided, and a number of alternate analog and digital implementations of the circuit are discussed.
REFERENCES:
patent: 3644763 (1972-02-01), Skrubisch
patent: 4392094 (1983-07-01), Kuhnlein
patent: 4494051 (1985-01-01), Bailey
patent: 4570118 (1986-02-01), Tomczak et al.
patent: 4642496 (1987-02-01), Kerviel et al.
patent: 4644234 (1987-02-01), Nola
patent: 4697125 (1987-09-01), Goff et al.
patent: 4751438 (1985-12-01), Markunas
patent: 4789826 (1988-12-01), Willett
patent: 4809742 (1989-03-01), Grau
patent: 4874997 (1989-10-01), Daggett et al.
patent: 5148070 (1992-09-01), Frye et al.
patent: 5159268 (1992-10-01), Wu
patent: 5173651 (1992-12-01), Buckley et al.
patent: 5225770 (1993-07-01), Montague
patent: 5313127 (1994-05-01), Danley et al.
patent: 5313151 (1994-05-01), Ogden et al.
patent: 5325005 (1994-06-01), Denk
patent: 5382890 (1995-01-01), Moh et al.
patent: 5619112 (1997-04-01), Younessi et al.
Duda Rina I.
Nappi Robert E.
LandOfFree
Method of controlling rotary position of a torque 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 Method of controlling rotary position of a torque motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of controlling rotary position of a torque motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-366359