US 6,147,427 A · Electromotive adjustable drive

Abstract

An electromotive actuating device having a movable member and a stationary member is disclosed. The device includes a first excitation part adapted to generate a constant magnetic flux and a second excitation part adapted to generate a magnetic flux of variable amplitude, a first and a second magnetic circuit is provided for guiding the magnetic flux generated by the first excitation part. The reluctance of the first and of the second magnetic circuit is controlled by means of the position of the movable member, and the second excitation part being included in the second magnetic circuit. An actuating device of this type has a rotary actuator having a range of more than 90.degree.. This is achieved in that the stationary member includes at least a first pole shoe, a second pole shoe and a third pole shoe. The first pole shoe and the third pole shoe form flux guiding elements of the first magnetic circuit. The second pole shoe and the third pole shoe form flux guiding elements of the second magnetic circuit.

Claims17

Dependent claims

An electromotive actuating device comprising:

a movable member;
a stationary member including at least a first pole shoe, a second pole shoe and a third pole shoe;
at least a first excitation part adapted to generate a constant magnetic flux;
at least a second excitation part adapted to generate a magnetic flux of variable amplitude;
at least a first and a second magnetic circuit being provided for guiding the magnetic flux generated by the first excitation part, the reluctance of the first and of the second magnetic circuit being controllable by means of the position of the movable member, and the second excitation part being included in the second magnetic circuit,
wherein the first pole shoe and the third pole shoe form flux guiding elements of the first magnetic circuit, and the first pole shoe, the second pole shoe and the third pole shoe form flux guiding elements of the second magnetic circuit, and
wherein a first width of an air gap formed between the movable member, and the first and the second pole shoe is different than a second width of the air gap between the stationary member and the third pole shoe.

4 more elements

An electromotive actuating device comprising:

a movable member;
a stationary member including at least a first pole shoe, a second pole shoe and a third pole shoe;
at least a first excitation part adapted to generate a constant magnetic flux;
at least a second excitation part adapted to generate a magnetic flux of variable amplitude;
at least a first and a second magnetic circuit being provided for guiding the magnetic flux generated by the first excitation part, the reluctance of the first and of the second magnetic circuit being controllable by means of the position of the movable member, and the second excitation part being included in the second magnetic circuit,
wherein the first pole shoe and the third pole shoe form flux guiding elements of the first magnetic circuit, and the first pole shoe, the second pole shoe and the third pole shoe form flux guiding elements of the second magnetic circuit, and
wherein the actuating device takes the form of a rotary actuator and in that a circumferential angle of the third pole shoe is smaller than a circumferential angle of the first and the second pole shoe.

4 more elements

An electromotive actuating device comprising:

a movable member;
a stationary member including at least a first pole shoe, a second pole shoe and a third pole shoe;
at least a first excitation part adapted to generate a constant magnetic flux;
at least a second excitation part adapted to generate a magnetic flux of variable amplitude;
at least a first and a second magnetic circuit being provided for guiding the magnetic flux generated by the first excitation part, the reluctance of the first and of the second magnetic circuit being controllable by means of the position of the movable member, and the second excitation part being included in the second magnetic circuit,
wherein the first pole shoe and the third pole shoe form flux guiding elements of the first magnetic circuit, and the first pole shoe, the second pole shoe and the third pole shoe form flux guiding elements of the second magnetic circuit, and
wherein the electromotive actuating device takes the form of a linear actuator.

4 more elements

Dependencies are inferred from the claim text.

Electromotive adjustable drive

Life of this patent

Electromotive adjustable drive

Life of this patent

Abstract

Claims17