Laundry appliance utilizing a permanent split capacitor motor having a sensor for providing temperature control within the appliance

Patent metadata

Field	Value
Publication number	US-11035074-B2
Application number	US-201916402444-A
Country	US
Kind code	B2
Filing date	May 3, 2019
Priority date	May 3, 2019
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A laundry appliance includes a blower that selectively delivers process air through an airflow path. A rotating drum defines a portion of the airflow path. The rotating drum is attached to a drive shaft that rotates the rotating drum about a rotational axis. The blower and the drive shaft are operated by a common motor. A heater selectively delivers heat to the airflow path. The heater defines an energizing state when a motor current delivered to the common motor is within a predetermined motor current range that is indicative of the common motor operating. The heater defines an idle state when the motor current is outside of the predetermined motor current range.

First claim

What is claimed is:

1. A laundry appliance comprising:
a blower that operates to selectively deliver process air through an airflow path;
a drive shaft that rotates about a rotational axis to operate a rotating drum, wherein the rotating drum defines a portion of the airflow path;
a permanent split capacitor motor that selectively activates to operate the blower and the drive shaft; and
a heater in communication with the airflow path that selectively delivers heat to the airflow path, wherein the heater defines an energizing state when the permanent split capacitor motor includes a motor current having a motor current level that is above a first threshold current and below a second threshold current.

2. The laundry appliance of claim 1 , wherein the heater in the energizing state is configured to receive an activation signal for delivering heat to the airflow path.

3. The laundry appliance of claim 1 , wherein the heater is configured to define an idle state when the permanent split capacitor motor includes a motor current level that is one of at or below the first threshold current, and at or above the second threshold current.

4. The laundry appliance of claim 3 , wherein the heater in the idle state is configured to remain deactivated.

5. The laundry appliance of claim 1 , wherein the permanent split capacitor motor is configured to contemporaneously operate the blower and the drive shaft.

6. The laundry appliance of claim 1 , wherein the permanent split capacitor motor is configured to operate the rotating drum in a clockwise direction and a counterclockwise direction about the rotational axis of the drive shaft.

7. The laundry appliance of claim 1 , wherein the permanent split capacitor motor is coupled with a current sensor that detects a presence of the motor current and the motor current level.

8. The laundry appliance of claim 7 , wherein the current sensor determines whether the motor current level is between the first and second threshold current.

9. The laundry appliance of claim 7 , wherein the heater includes a heater enable actuator that is coupled with the current sensor and a heater actuator that is coupled with a temperature sensor, wherein the heater is activated when each of the heater enable actuator and the heater actuator are closed.

10. The laundry appliance of claim 1 , wherein the permanent split capacitor motor includes a capacitor that is attached to a housing of the permanent split capacitor motor.

11. The laundry appliance of claim 1 , wherein the permanent split capacitor motor is configured to be installed to operate the blower and the drive shaft as an aftermarket component.

12. A laundry appliance comprising:
a blower that selectively delivers process air through an airflow path;
a rotating drum that defines a portion of the airflow path, wherein the rotating drum is attached to a drive shaft that rotates the rotating drum about a rotational axis, wherein the blower and the drive shaft are operated by a permanent split capacitor motor; and
a heater that selectively delivers heat to the airflow path, wherein the heater defines an energizing state when a motor current delivered to the permanent split capacitor motor is within a predetermined motor current range that is indicative of the permanent split capacitor motor operating, wherein the heater defines an idle state when the motor current is outside of the predetermined motor current range.

13. The laundry appliance of claim 12 , wherein the predetermined motor current range includes a motor current that is above a first threshold current and below a second threshold current.

14. The laundry appliance of claim 12 , wherein the permanent split capacitor motor includes a primary winding, an auxiliary winding and a capacitor that is coupled with the auxiliary winding.

15. The laundry appliance of claim 12 , wherein the heater in the energizing state is configured to receive an activation signal that activates the heater to deliver heat to the airflow path.

16. The laundry appliance of claim 12 , further comprising:
a current sensor that detects a presence of the motor current and detects a level of the motor current in relation to the predetermined motor current range.

17. The laundry appliance of claim 14 , wherein the capacitor is attached to a housing of the permanent split capacitor motor.

18. The laundry appliance of claim 14 , wherein the permanent split capacitor motor is configured to be installed to operate the blower and the drive shaft as an aftermarket component.

19. A method for operating a heater for a laundry appliance including steps of:
detecting a level of a motor current delivered to a permanent split capacitor motor that contemporaneously drives a blower and a rotating drum;
energizing the heater to define an energizing state when the level of the motor current is above a first threshold current indicative of the permanent split capacitor motor operating and below a second threshold current indicative of a stalled condition of the permanent split capacitor motor; and
activating the heater when in the energizing state and when an activation signal is delivered to the heater.

20. The method of claim 19 , wherein the step of activating the heater includes measuring a temperature proximate one of the heater and the rotating drum using a thermocouple.

Assignees

• Whirlpool Co

Inventors

• Galloway Beau D
• Lopez Eduardo Abraham
• Savage Jason R
• Landrey Jeffrey F

Classifications

• D06F2103/32

  Temperature · CPC title

• D06F2105/30

  Blowers · CPC title

• H02P1/44

  by phase-splitting with a capacitor · CPC title

• H02K11/27

  Devices for sensing current, or actuated thereby (overcurrent protection responsive to temperature of the machines or parts thereof, e.g. windings, H02K11/25) · CPC title

• D06F2103/00

  Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers · CPC title