Apparatus and method for rotor temperature measurement

Patent metadata

Field	Value
Publication number	US-11527941-B2
Application number	US-202017110865-A
Country	US
Kind code	B2
Filing date	Dec 3, 2020
Priority date	Dec 3, 2020
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

An apparatus for automobile vehicle rotor temperature measurement includes a motor having a rotor. A stator has the rotor positioned within the stator. An aperture extends through the stator. A sensor is positioned in alignment with the aperture sensing a temperature of at least a surface of the rotor.

First claim

What is claimed is:

1. An apparatus for automobile vehicle rotor temperature measurement, comprising:
a motor having a rotor;
a stator with the rotor positioned within the stator, the stator having a stator surface;
a first aperture or opening extending through the stator;
a sensor positioned in alignment with the first aperture sensing a temperature of at least a surface of the rotor, the sensor having a lens; and
an air gap between the lens of the sensor and the rotor, the air gap minimizing a heat transfer to the sensor from the rotor and providing a non-contact rotor temperature measurement in the air gap, and
wherein the air gap is disposed between the lens of the sensor and the stator surface.

2. The apparatus of claim 1 , wherein the first aperture defines a step aperture extending through the stator.

3. The apparatus of claim 2 , further including a second aperture or opening extending through a housing supporting the sensor, wherein a diameter of the first aperture is smaller than a diameter of the second aperture.

4. The apparatus of claim 3 , further including a stator surface visible to the sensor through the second aperture.

5. The apparatus of claim 1 , wherein the air gap is further located between a housing supporting the sensor and the surface of the rotor.

6. The apparatus of claim 1 , wherein the stator includes multiple teeth, with the first aperture extending through at least one of the multiple teeth.

7. The apparatus of claim 1 , wherein the sensor defines an infrared detector.

8. A method for automobile vehicle rotor temperature measurement for a motor, comprising:
positioning a rotor of the motor within a stator of the motor;
creating a first aperture or opening extending through the stator;
aligning a sensor with the first aperture;
operating the sensor to sense a temperature of at least a surface of the rotor; and receiving a total radiation W tot by the sensor equal to [an emission of surroundings reflected by a target defining the surface of the rotor]+[an emission of the target]+[an absorption through an atmosphere and external optics].

9. The method of claim 8 , further including shaping the first aperture as a step aperture extending through the stator and further including a second aperture or opening extending through a housing supporting the sensor, with a stator surface visible to the sensor through the second aperture.

10. The method of claim 9 , further including selecting the sensor as an infrared detector sensing the surface of the rotor and the stator surface.

11. The method of claim 8 , further including extending the aperture through at least one of multiple teeth of the stator.

12. The method of claim 8 , further including:
assuming an initial reflected sensed temperature T_refl_initial of the surface of the rotor to be equal to a motor oil temperature T oil of the motor or a stator temperature if the motor oil as a coolant oil is not available; and
calculating a reflected temperature T refl which is equal to a constant C refl multiplied by [a rotor temperature T rotor plus a stator temperature T stator ] divided by two.

13. The method of claim 12 , further including:
substituting the reflected temperature T refl for the initial reflected sensed temperature T_refl_initial of the surface of the rotor; and
performing at least a second iteration of the calculating the reflected temperature T refl .

14. A method for automobile vehicle rotor temperature measurement of a motor, comprising:
positioning a rotor of the motor within a stator of the motor;
aligning an infrared sensor with a surface of the rotor;
in an obtaining step obtaining multiple items from vehicle sensor data including a motor oil temperature T oil ; an infrared sensor stator temperature signal IR_stator_raw, an infrared sensor rotor signal IR_rotor_raw, an object emissivity ε_obj of the rotor, a predetermined transmission rate τ_atm, an atmospheric temperature T_atm, and a temperature at the sensor T_optic, wherein an initial reflected sensed temperature T_refl_initial is assumed to be equal to the motor oil temperature T oil of the motor;
performing a first temperature calibration if the motor oil temperature T oil is less than 40° C. or a second temperature calibration if the motor oil temperature T oil is equal to or greater than 40° C.; and
calculating a value of a reflected temperature T refl which is equal to a constant C refl multiplied by [a rotor temperature T rotor plus a stator temperature T stator ] divided by two.

15. The method of claim 14 , further including performing at least a second iteration after determining the reflected temperature T refl by returning to the obtaining step and replacing the initial reflected sensed temperature T_refl_initial initially assumed to be equal to the motor oil temperature T oil of the motor with the value of the reflected temperature T refl .

16. The method of claim 14 , further including extending a step-aperture in a stator lamination defining an infrared radiation pathway from the infrared sensor to enable simultaneous infrared sensing on the surface of the rotor and on a surface of the stator.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Zeng Wei
• Parrish Scott E
• Hao Lei
• Dernotte Jeremie

Classifications

• G01J5/0859

  Sighting arrangements, e.g. cameras · CPC title

• G01J5/80

  Calibration (using comparison with reference sources G01J5/52) · CPC title

• G01J5/042

  High-temperature environment (G01J5/0007, G01J5/0044, G01J5/0088 and G01J5/004 take precedence) · CPC title

• G01J5/0022

  for sensing the radiation of moving bodies · CPC title

• H02K11/25 Primary

  Devices for sensing temperature, or actuated thereby · CPC title