Cleaning and motor heating electromagnetic motor control switching

Patent metadata

Field	Value
Publication number	US-9766291-B2
Application number	US-201514832871-A
Country	US
Kind code	B2
Filing date	Aug 21, 2015
Priority date	Nov 6, 2014
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

One embodiment describes a switching device system, which includes a first single pole switching device that selectively connects and disconnects a first phase of electric power to a first winding of a three phase motor; a second single switching device that selectively connects and disconnects a second phase of electric power to a second winding of the three phase motor; in which the first and second single pole switching devices control temperature of the motor by, at a first time, connecting the first phase and the second phase electric power to the motor.

First claim

The invention claimed is:

1. A switching device system comprising:
a first single pole switching device configured to selectively connect and disconnect a first phase of electric power to a first winding of a three phase motor;
a second single pole switching device configured to selectively connect and disconnect a second phase of electric power to a second winding of the three phase motor;
wherein the first single pole switching device and the second single pole switching device are configured to control temperature of the three phase motor by, at a first time, connecting the first phase and the second phase of electric power to the three phase motor, wherein the first single pole switching device and the second single pole switching device are configured to connect the first phase and the second phase of electric power to the three phase motor based at least in part on a current zero-crossing between the first phase and the second phase.

2. The switching device of claim 1 , comprising a third single pole switching device configured to selectively connect and disconnect a third phase of electric power to a third winding of the three phase motor;
wherein the first single pole switching device, the second single pole switching device, and the third single pole switching device are configured to control temperature of the three phase motor by:
at a second time, connecting the first phase and the third phase of electric power to the three phase motor; and
at a third time, connecting the second phase and the third phase of electric power to the three phase motor.

3. The switching device system of claim 1 , wherein the first single pole switching device and second single pole switching device are configured to form a wye-delta starter.

4. The switching device system of claim 3 , wherein the first single pole switching device is configured to connect the first winding in a delta configuration and the second single pole switching device is configured to connect the second winding in the delta configuration.

5. The switching device system of claim 1 , wherein the first single pole switching device and the second single pole switching device are configured to form a direct-on-line switching device.

6. The switching device system of claim 1 , wherein the first single pole switching device and the second single pole switching device each comprise a single pole, single current carrying path switching device or a single pole, multi current carrying path switching device.

7. The switching device system of claim 1 , wherein the first single pole switching device and the second single pole switching device are configured to periodically supply the first phase and the second phase of electric power to the three phase motor.

8. The switching device system of claim 1 , wherein the first single pole switching device and the second single pole switching device are configured to supply the first phase and the second phase of electric power to the three phase motor based on temperature of the temperature of the three phase motor measured by a temperature sensor.

9. The switching device system of claim 1 , wherein the first single pole switching device and the second single pole switching device are configured to facilitate detecting a phase to phase fault in the three phase motor.

10. A tangible, non-transitory, computer readable medium configured to store instructions executable by a processor, wherein the instructions comprise instructions to:
instruct, using the processor, a temperature sensor to determine temperature of a motor when the motor is not in operation;
instruct, using the processor, one or more switching devices to supply a first phase of electric power to a first winding of the motor and a second phase of electric power to a second winding of the motor when the temperature of the motor is less than a threshold temperature such that a first current is conducted through the first winding, the first current is conducted through the second winding, and the motor does not actuate;
determine, using the processor, that a short circuit is present when the first current is rapidly increasing; and
determine, using the processor, that a phase-to-phase open circuit is present when the first current is zero.

11. The computer readable medium of claim 10 , comprising instructions to:
instruct, using the processor, the one or more switching devices to supply the first phase of electric power to the first winding and a third phase of electric power to a third winding of the motor when the temperature of the motor is less than the threshold temperature such that a second current is conducted through the first winding, the second current is conducted through the third winding, and the motor does not actuate; and
instruct, using the processor, the one or more switching devices to supply the second phase of electric power to the second winding and the third phase of electric power to the third winding when the temperature of the motor is less than the threshold temperature such that a third current is conducted through the second winding, the third current is conducted through the third winding, and the motor does not actuate.

12. The computer readable medium of claim 10 , wherein the one or more switching devices comprises:
a first single pole switching device configured to selectively connect and disconnect the first phase of electric power to the first winding; and
a second single switching device configured to selectively connect and disconnect the second phase of electric power to the second winding.

13. The computer readable medium of claim 10 , wherein the one or more switching devices comprises a multi pole, multi current carrying path switching device comprising:
a first pole configured to selectively connect and disconnect the first phase of electric power to the first winding; and
a second pole configured to selectively connect and disconnect the second phase of electric power to the second winding.

Assignees

• Rockwell Automation Tech Inc
• Rockwell Automation Tech Inc

Inventors

• Bock Christopher H
• Wieloch Christopher J
• Kinsella James J
• Dziekonski Stefan T

Classifications

• H01H50/38

  Part of main magnetic circuit shaped to suppress arcing between the contacts of the relay · CPC title

• H01H47/002

  Monitoring or fail-safe circuits · CPC title

• H01H89/00

  Combinations of two or more different basic types of electric switches, relays, selectors and emergency protective devices, not covered by any single one of the other main groups of this subclass · CPC title

• H01H50/002

  particular to three-phase electromagnetic relays (synchronous switching H01H9/563) · CPC title

• H02P1/26

  for starting an individual polyphase induction motor · CPC title