Rotating electric machine winding temperature estimation device and rotating electric machine winding temperature estimation method

Patent metadata

Field	Value
Publication number	US-9960728-B2
Application number	US-201515318394-A
Country	US
Kind code	B2
Filing date	Jun 25, 2015
Priority date	Jun 27, 2014
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

A winding temperature estimation device for a rotating electric machine includes a rotating electric machine including a stator, which has a winding, and a rotor, a coolant supply part configured to supply a coolant, a temperature sensor configured to detect a temperature of the coolant, a heat reduction amount calculation part configured to calculate a heat reduction amount of the winding using the temperature of the coolant and a heat resistance between the coolant and the winding, a heating value calculation part configured to calculate a heating value due to a loss of the winding, and a winding temperature calculation part configured to calculate a temperature of the winding using the heat reduction amount from the winding and the heating value due to the loss of the winding.

First claim

The invention claimed is:

1. A winding temperature estimation device for a rotating electric machine comprising:
a rotating electric machine comprising a stator, which has slots and a winding configured with a plurality of segmented conducting wires that are inserted into the slots according to a shape of the slots and that have wire widths corresponding to widths of the slots, and a rotor;
a coolant supply part configured to supply a coolant to the winding and the stator;
a temperature sensor configured to detect a temperature of the coolant;
a heat reduction amount calculation part configured to calculate a heat reduction amount from the winding using the temperature of the coolant and a heat resistance of at least a portion between the coolant and the winding;
a heating value calculation part configured to calculate the heating value based on a copper loss and an eddy current loss of the winding; and
a winding temperature calculation part configured to calculate a temperature of the winding using the heat reduction amount from the winding and the heating value due to the loss of the winding.

2. The winding temperature estimation device for a rotating electric machine according to claim 1 ,
wherein the heating value calculation part comprises a stator heating value calculation part configured to calculate a heating value due to an iron loss of the stator,
wherein the heat reduction amount calculation part comprises a stator temperature calculation part configured to calculate a temperature of the stator using the heating value due to the iron loss of the stator, the temperature of the coolant, and a heat resistance between the coolant and the stator, and
wherein the heat reduction amount from the winding is calculated using the temperature of the stator, a heat resistance between the stator and the winding, the temperature of the coolant, and the heat resistance between the coolant and the winding.

3. The winding temperature estimation device for a rotating electric machine according to claim 1 ,
wherein the heat reduction amount calculation part calculates heat resistances according to a flow rate of the coolant and number of revolutions of the rotating electric machine.

4. The winding temperature estimation device for a rotating electric machine according to claim 2 ,
wherein the heat reduction amount calculation part calculates heat resistances according to a flow rate of the coolant and number of revolutions of the rotating electric machine.

5. A winding temperature estimation method for a rotating electric machine
comprising a stator, which has slots and a winding constituted by a plurality of segmented conducting wires that are inserted into the slots according to a shape of the slots and that have wire widths corresponding to widths of the slots, a rotor, and a coolant supply part configured to supply a coolant to the winding and the stator;

said method comprising:
detecting a temperature of the coolant;
calculating a heat reduction amount from the winding using the temperature of the coolant and a heat resistance of at least a portion between the coolant and the winding;
calculating the heating value based on a copper loss and an eddy current loss of the winding, and
calculating a temperature of the winding using the heat reduction amount of the winding and the heating value due to the loss of the winding.

Assignees

• Honda Motor Co Ltd

Inventors

• Ito Yuta
• Matsubara Munehiro
• Matsuoka Hiroyuki

Classifications

• H02K9/19

  for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil · CPC title

• H02K9/193

  with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium · CPC title

• H02P29/64 Primary

  Controlling or determining the temperature of the winding · CPC title

• H02K11/25

  Devices for sensing temperature, or actuated thereby · CPC title

• H02K1/16

  Stator cores with slots for windings · CPC title