Process and apparatus for verifying the cut-off torque of an actuator

• US 5,287,755 A
• Filed: 06/15/1992
• Issued: 02/22/1994
• Est. Priority Date: 12/14/1989
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Stecher, Willi
• Primary Examiner(s): MYRACLE, JERRY
• Application Number:
  US07/898,487
• Time in Patent Office: 617 Days
• Field of Search: 73/862.12, 73/118.1, 73/862.13, 73/862.23
• US Class Current: 73/862.23
• CPC Class Codes: G01R 31/34 Testing dynamo-electric machines

Abstract

An actuator has a driven shaft for an armature, a final torque switch and at least one electric lead. A process for verifying the cutoff torque of an actuator of an armature includes lifting the actuator away from the armature while keeping at least one electric lead connected to the actuator, connecting a torque measuring shaft and a brake connected to the torque measuring shaft to the driven shaft of the actuator, operating the actuator in the immediate vicinity of the armature and then braking the actuator until response of the final torque switch to ascertain a cutoff torque, and comparing the cutoff torque with a set-point cutoff torque. An apparatus for verifying the turnoff torque of an actuator of an armature includes a torque measuring shaft and a brake being connected to each other. Either the torque measuring shaft or the brake is connected to the driven shaft of the actuator in the immediate vicinity of the armature with the actuator being separated from the armature and with the at least one electric lead being connected to the actuator.

Claims

1. A process for verifying the cutoff torque of an actuator of an armature, the actuator having a driven shaft for the armature, a final torque switch and at least one electric lead, which comprises lifting the actuator away from the armature while keeping at least one electric lead connected to the actuator, connecting a torque measuring shaft and a brake connected to the torque measuring shaft to the driven shaft of the actuator, operating the actuator in the immediate vicinity of the armature and then braking the actuator until response of the final torque switch to ascertain a cutoff torque, and comparing the cutoff torque with a setpoint cutoff torque.

2. The process according to claim 1, which comprises measuring and recording a course of the torque until response of the final torque switch.

3. The process according to claim 1, which comprises lifting the actuator from the armature and suspending the actuator from a hoisting tool, and operating the actuator while keeping the actuator suspended.

4. The process according to claim 1, which comprises lifting the actuator from the armature and positioning the actuator with the driven shaft pointing upward while operating the actuator.

5. An apparatus for verifying the turnoff torque of an actuator of an armature, the actuator having a driven shaft for the armature, a final torque switch and at least one electric lead, comprising a torque measuring shaft component and a brake component being connected to each other, one of said components being connected to the driven shaft of the actuator in the immediate vicinity of the armature with the actuator being separated from the armature and with the at least one electric lead being connected to the actuator.

6. The apparatus according to claim 5, wherein said brake component is a multiple disk brake.

7. The apparatus according to claim 5, including an adaptor connecting said one component to the driven shaft.

8. The apparatus according to claim 5, including a component housing surrounding said components and having an opening formed therein through which said one component is connected to the driven shaft of the actuator.

9. The apparatus according to claim 8, wherein the actuator has an actuator housing, and said component housing includes a base plate facing said opening, side walls disposed on said base plate, and a flange being formed onto said side walls and surrounding said opening for connection to the actuator housing.

10. The apparatus according to claim 9, wherein said side walls are formed by a pipe.

11. The apparatus according to claim 5, including a voltage transducer communicating with said brake component.

12. The apparatus according to claim 5, including an evaluation unit communicating with said torque measuring shaft component.