HVAC ACTUATOR

• US 20170356667A1
• Filed: 06/09/2017
• Published: 12/14/2017
• Est. Priority Date: 06/10/2016
• Status: Active Grant

• Current Assignee: Denso International America Incorporated (DENSO Corporation)
• Original Assignee: Denso International America Incorporated (DENSO Corporation)
• Inventors: NISHIKAWA, Katsumi, LEE, Young Kwon, PORTER, Matt
• Granted Patent: US 10,069,448 B2
• Time in Patent Office: Days
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/72 for controlling the supply of treated air, e.g. its pressure
• CPC Class Codes: F24F 13/1426 characterised by actuating means
• CPC Class Codes: F24F 2013/1433 with electric motors
• CPC Class Codes: F24F 2013/148 with magnets
• CPC Class Codes: F24F 2110/00 Control inputs relating to air properties
• CPC Class Codes: F24F 2140/40 Damper positions, e.g. open or closed
• CPC Class Codes: H02K 11/225 Detecting coils
• CPC Class Codes: H02K 7/116 with gears
• CPC Class Codes: H02K 7/1166 comprising worm and worm-wheel structural association with bearings specially adapted for worm gear drives H02K7/081
• CPC Class Codes: H02P 7/0094 wherein the position is detected using the ripple of the current caused by the commutator

Abstract

A heating, ventilation, and air conditioning (HVAC) system actuator including a stator magnet and a rotor magnet. The rotor magnet turns an axle connected to an airflow door such that rotation of the axle moves the door and generates waveforms. The number of waveforms generated corresponds to how much the axle has rotated. The stator magnet is magnetized to a saturated state, thereby providing the waveforms with a consistent shape that is consistently detectable by a climate control pulse count module.

Claims

1. A heating, ventilation, and air conditioning (HVAC) system comprising:

an actuator including a stator magnet and a rotor magnet that turns an axle connected to an airflow door by way of a gear train such that rotation of the axle moves the door and generates current pulse waveforms, the number of current pulse waveforms generated corresponds to how much the axle rotates, the stator magnet is magnetized to a saturated state thereby providing the current pulse waveforms with a consistent shape that is consistently detectable by a climate control pulse count module.

2. The HVAC system of claim 1, wherein the actuator is an HVAC airflow door actuator.

3. The HVAC system of claim 2, wherein the actuator is a DC motor.

4. The HVAC system of claim 1, wherein the stator magnet includes rubber.

5. The HVAC system of claim 1, wherein the current pulse waveforms gradually increase in intensity.

6. The HVAC system of claim 1, further comprising a climate control module including the climate control pulse count module and a control sub-module;

wherein the pulse count module generates pulses corresponding to the number of current pulse waveforms received by the pulse count module, and outputs the pulses to the control sub-module.

7. The HVAC system of claim 6, wherein the control sub-module identifies position of the airflow door based on the number of pulses received from the pulse count module.

8. The HVAC system of claim 1, wherein the stator magnet is magnetized to a saturation condition of about 1,450 volts.

9. A heating, ventilation, and air conditioning (HVAC) system comprising:

an actuator including a magnet magnetized to saturation, an axle of the actuator is connected to an airflow door such that rotation of the axle moves the airflow door and generates current pulse waveforms with a consistent shape that is consistently detectable by a climate control pulse count module, the number of current pulse waveforms generated corresponds to how much the axle rotates.

10. The HVAC system of claim 9, further comprising a climate control module including the climate control pulse count module and a control sub-module;

wherein the pulse count module generates pulses corresponding to the number of current pulse waveforms received by the pulse count module, and outputs the pulses to the control sub-module; and

wherein the control sub-module identifies position of the airflow door based on the number of pulses received from the pulse count module.

11. The HVAC system of claim 9, wherein the magnet is a stationary field magnet;

and

wherein the actuator further comprises a rotatable armature magnet that rotates the axle.

12. The HVAC system of claim 11, wherein the stationary field magnet includes rubber.

13. An actuator for a heating, ventilation, and air conditioning (HVAC) system, the actuator comprising:

a magnet magnetized to saturation; and

an axle, rotation of the axle moves airflow control doors connected to the axle;

wherein in response to rotation of the axle the actuator generates current pulse waveforms, the number of current pulse waveforms generated corresponds to how much the axle has rotated, the current pulse waveforms have a consistent shape that is regularly detectable by a climate control pulse count module.

14. The actuator of claim 13, wherein each one of the current pulse waveforms gradually increases in voltage.

15. The actuator of claim 13, wherein the actuator is a DC actuator motor.

16. The actuator of claim 13, further comprising a climate control module including the climate control pulse count module and a control sub-module;

wherein the climate control pulse count module generates pulses corresponding to the number of current pulse waveforms received by the climate control pulse count module, and outputs the pulses to the control sub-module.

17. The actuator of claim 16, wherein the control sub-module identifies position of the airflow door based on the number of pulses received from the pulse count module.

18. The actuator of claim 13, wherein the magnet is magnetized with about 1,450 volts.