APPARATUS FOR OPERATING A RESOLVER, RESOLVER DEVICE AND METHOD FOR OPERATING A RESOLVER DEVICE

• US 20150362341A1
• Filed: 06/11/2015
• Published: 12/17/2015
• Est. Priority Date: 06/12/2014
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Kirschner, Manfred, Eberlein, Edwin
• Granted Patent: US 9,857,204 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01D 3/08 with provision for safeguarding the apparatus, e.g. against abnormal operation, against breakdown
• CPC Class Codes: G01D 5/2073 by movement of a single coil with respect to two or more coils
• CPC Class Codes: G01D 5/2291 Linear or rotary variable differential transformers (LVDTs/RVDTs) having a single primary coil and two secondary coils

Abstract

An apparatus for operating a resolver which includes at least one first receiver winding and an exciter winding, which are/can be associated with a rotor, and an evaluation device which determines an angular position of the rotor as a function of an induced voltage that is generated by the exciter winding and detected by the receiver winding . According to the invention, the first receiver winding is connected at a first end to an actuable switch by means of a first RC circuit, said switch connecting the RC circuit as required to a positive voltage source, and the first receiver winding is connected at a second end to a second actuable switch by means of a second RC circuit, said second switch connecting the second RC circuit as required to a negative voltage source, and to a control unit which simultaneously actuates the switches as required.

Claims

1. An apparatus for operating a resolver which comprises at least one first receiver winding and an exciter winding which are associated with a rotor, and an evaluation device which determines an angular position of the rotor as a function of an induced voltage that is generated by the exciter winding and detected by the receiver winding, wherein the first receiver winding is connected at a first end to an actuable switch by a first RC circuit, said switch connecting the RC circuit as required to a positive voltage source, and wherein the first receiver winding is connected at a second end to a second actuable switch by a second RC circuit, said second switch connecting the second RC circuit as required to a negative voltage source, and to a control unit which simultaneously actuates the switches as required and thereby monitors the oscillation behavior of the first receiver winding in order to detect a defect in the resolver.

2. The apparatus according to claim 1, wherein the switches are designed as transistors.

3. A resolver device comprising a resolver which has at least two receiver windings and at least one exciter winding, which is associated with a rotor, and an evaluation device which determines an angular position of the rotor as a function of a voltage induced by the rotor winding and the receiver winding, wherein an apparatus according to claim 1 is associated with at least one of the receiver windings.

4. The resolver device according to claim 3, wherein an apparatus according to claim 1 is associated with each receiver winding of the resolver.

5. The method for operating a resolver device according to claim 1, wherein the switches are simultaneously actuated and in that a resulting oscillation behavior of the at least one receiver winding is monitored and a defect in the resolver is suggested as a function of the oscillation behavior.

6. The method according to claim 5, wherein the voltages are acquired at the switches in order to monitor the oscillation behavior.

7. The method according to claim 1, wherein a faultless operation is recognized if a decaying oscillation behavior is detected.

8. The method according to claim 1, wherein a short circuit is suggested if the detected voltages correspond at least substantially to one another.

9. The method according to claim 1, wherein an interruption is suggested if the detected voltages are different from one another at least substantially in an oscillation-free manner.