Claw type torque motor and throttle valve employing same

Details Claw type torque motor and throttle valve employing same Claw type torque motor and throttle valve employing same

2000-01-11

2001-05-29

Ip, Paul (Department: 2837)

Electricity: motive power systems

Battery-fed motor systems

C318S132000, C318S254100, C318S432000, C310S254100, C123S399000

Reexamination Certificate

active

06239562

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable
MICROFICHE APPENDIX
Not Applicable
BACKGROUND OF THE INVENTION
The present invention relates to torque motors or motors of the type wherein the shaft is rotated by an amount less than one-half revolution in either direction from a center position. Torque motors are typically employed for rotary actuation of a device to be electrically controlled, as for example a servo motor rotary valve. Torque motors capable of operating on relatively low voltage direct current power have been found particularly suitable for actuating valve applications such as the air throttle valve of an internal combustion engine and particularly throttle valves for engines in motor vehicles.
In motor vehicle air throttle applications, it is necessary that a torque motor employed for rotating the throttle shaft against the force of the throttle return spring provide substantial torque at a relatively low wattage in view of the low voltage available on board typically twelve to twenty-four volts DC. Furthermore it is desired that the mass and volume of the torque motor be minimized to facilitate mounting on the air throttle body to reduce the inertial loading from vibration induced by engine operation and jounce from vehicle movement. Heretofore, known torque motors for vehicle air throttle applications have been bulky, heavy and difficult to assemble and mount on the air throttle and thus relatively costly in high volume mass production of vehicle engines.
Accordingly, it has been desired to provide a relatively low wattage torque motor operating from a low voltage direct current supply such as encountered on board a motor vehicle and one which has a relatively low mass and reduced volume with a relatively high torque output for the power available for the motor.
BRIEF SUMMARY OF THE INVENTION
The present invention provides a torque motor and throttle assembly combination having an annular stator with permanent magnets disposed on the inner periphery thereof. The shaft has rotor iron configured in a generally S-shaped configuration in an axis of symmetry taken through the rotor shaft and which has the stator coil nested therein. The generally S-shaped rotor iron is formed in two pole segments joined axially and thus enabling assembly of the S-shape over the stator coil. A torque motor of the present invention thus maximizes the amount of flux collecting iron in the stator and rotor and maximizes the pole surfaces proximate the radial air gap between the rotor and stator and thus provides optimal torque for given ampere turns of the stator coil.
The rotor having an S-shaped configuration in transverse section at the plane of symmetry is formed by two generally L-shaped segments joined axially with each segment having an arcuately shaped flange portion with the flanges oppositely disposed for maximizing the amount of flux collecting rotor material disposed adjacent the radial air gap formed between the rotor outer periphery and the inner periphery of the semi-cylindrical stator magnets. The arrangement of the arcuate flanges of the rotor thus maximizes the amount of magnetic flux flowing between the rotor and the stator magnets for a given ampere turn excitation of the stator coil.


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patent: 6147427 (2000-11-01), Ackermann et al.
patent: B1 6167866 (2001-01-01), Jakisch et al.

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