# US 10,309,842 B2 · Magnet temperature estimation device for rotating electric machine and magnet temperature estimation method for rotating electric machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,309,842 B2 - Document ID: US10309842B2 - Status: Granted - Kind: B2 - Application number: 15/309,515 - Filed: 2015-05-08 - Published: 2017-05-11 - Granted: 2019-06-04 - Earliest claimed: 2014-05-09 - Assignees: Honda Motor Co., Ltd. - Applicants: Honda Motor Co., Ltd. - Inventors: Munehiro Matsubara; Yuta Ito - Web page: https://patentgrep.com/patent/US10309842B2 ## CPC - G01K 17/06: Measuring quantity of heat conveyed by flowing media, e.g. in heating systems (G01K17/02, G01K17/04 take precedence){e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device} - G01K 7/42: Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature - G01K 13/02: for measuring temperature of moving fluids or granular materials capable of flow - G01K 13/08: in rotary movement - H02K 1/32: with channels or ducts for flow of cooling medium - H02K 9/00: Arrangements for cooling or ventilating (channels or ducts in parts of the magnetic circuit H02K1/20, H02K1/32; channels or ducts in or between conductors H02K3/22, H02K3/24) - H02K 9/19: for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil - H02K 11/25: Devices for sensing temperature, or actuated thereby - H02P 29/60: Controlling or determining the temperature of the motor or of the drive (H02P29/02 takes precedence) - H02P 29/66: Controlling or determining the temperature of the rotor - G01K 13/026: {of moving liquids} - G01K 2205/00: Application of thermometers in motors, e.g. of a vehicle - G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS ## Abstract A magnet temperature estimation device for a rotating electric machine includes a rotating electric machine configured with a rotor having a magnet and a stator having a coil, a coolant supply part configured to supply a coolant flowing from the stator toward the rotor, and a magnet temperature calculation part configured to calculate a temperature of the magnet using a temperature of a coolant that receives heat from the coil. ## Claims ### Claim 1 A magnet temperature estimation device for a rotating electric machine, the magnet temperature estimation device comprising: a rotating electric machine configured with a rotor having a magnet and a stator having a coil; a coolant supply part configured to supply a coolant flowing from the stator toward the rotor; and a magnet temperature calculation part configured to calculate a temperature of the magnet using a temperature of the coolant that has received heat from the coil, wherein the magnet temperature calculation part calculates a heat resistance of at least a portion between the magnet and the coolant that has received heat from the coil, calculates a heat reduction amount from the magnet using the heat resistance and a temperature of the coolant that has received heat from the coil, and calculates the temperature of the magnet using the heat reduction amount from the magnet, and wherein the magnet temperature estimation device controls the operation of the rotating electric machine based on the calculated temperature of the magnet. ### Claim 2 (depends on 1) The magnet temperature estimation device for a rotating electric machine according to claim 1, wherein the magnet temperature calculation part calculates the heat resistance in accordance with a flow rate of the coolant and number of revolutions of the rotating electric machine. ### Claim 3 (depends on 2) The magnet temperature estimation device for a rotating electric machine according to claim 2, comprising a heating value calculation part configured to calculate a heating value due to loss of the magnet, wherein the magnet temperature calculation part calculates the temperature of the magnet using the heating value due to the loss of the magnet and the heat reduction amount from the magnet. ### Claim 4 (depends on 2) The magnet temperature estimation device for a rotating electric machine according to claim 2, comprising a coolant temperature calculation part configured to calculate the temperature of the coolant that has received heat from the coil, wherein the coolant temperature calculation part acquires a heat receiving amount of the coolant that has received heat from the coil and a heat capacity of the coolant in accordance with the flow rate of the coolant, and calculates the temperature of the coolant that has received heat from the coil using the heat receiving amount of the coolant that has received heat from the coil and the heat capacity of the coolant. ### Claim 5 (depends on 1) The magnet temperature estimation device for a rotating electric machine according to claim 1, comprising: a heating value calculation part configured to calculate a heating value due to loss of the magnet, wherein the magnet temperature calculation part calculates the temperature of the magnet using the heating value due to the loss of the magnet and the heat reduction amount from the magnet. ### Claim 6 (depends on 5) The magnet temperature estimation device for a rotating electric machine according to claim 5, comprising a coolant temperature calculation part configured to calculate the temperature of the coolant that has received heat from the coil, wherein the coolant temperature calculation part acquires a heat receiving amount of the coolant that has received heat from the coil and a heat capacity of the coolant in accordance with the flow rate of the coolant, and calculates the temperature of the coolant that has received heat from the coil using the heat receiving amount of the coolant that has received heat from the coil and the heat capacity of the coolant. ### Claim 7 (depends on 1) The magnet temperature estimation device for a rotating electric machine according to claim 1, comprising a coolant temperature calculation part configured to calculate the temperature of the coolant that has received heat from the coil, wherein the coolant temperature calculation part acquires a heat receiving amount of the coolant that has received heat from the coil and a heat capacity of the coolant in accordance with the flow rate of the coolant, and calculates the temperature of the coolant that has received heat from the coil using the heat receiving amount of the coolant that has received heat from the coil and the heat capacity of the coolant. ### Claim 8 (depends on 7) The magnet temperature estimation device for a rotating electric machine according to claim 7, comprising a cooling part configured to cool the coolant, wherein the coolant temperature calculation part acquires a heat resistance between the coil and the coolant that has received heat from the coil in accordance with the flow rate of the coolant, and calculates the heat receiving amount of the coolant that has received heat from the coil using the heat resistance between the coil and the coolant that has received heat from the coil, the temperature of the coil, and a temperature of the coolant cooled by the cooling part. ### Claim 9 A magnet temperature estimation method for a rotating electric machine performed by a control device with respect to: a rotating electric machine configured with a rotor having a magnet and a stator having a coil, and a coolant supply part configured to supply a coolant flowing from the stator toward the rotor, the magnet temperature estimation method for a rotating electric machine comprising: calculating a temperature of the magnet using a temperature of a coolant that has received heat from the coil, wherein the calculating the temperature of the magnet includes calculating a heat resistance of at least a portion between the magnet and the coolant that has received heat from the coil, calculating a heat reduction amount from the magnet using the heat resistance and a temperature of the coolant that has received heat from the coil, and calculating the temperature of the magnet using the heat reduction amount from the magnet, and controlling the operation of the rotating electric machine based on the calculated temperature of the magnet. ### Claim 10 (depends on 9) The magnet temperature estimation device according to claim 9, wherein the magnet temperature estimation device controls the transmission or power conversion of the rotating electric machine based on the calculated temperature of the magnet. ### Claim 11 (depends on 9) The magnet temperature estimation method according to claim 9, wherein said controlling the operation of the rotating electric machine based on the calculated temperature of the magnet includes controlling the transmission or power conversion of the rotating electric machine. ### Claim 12 A magnet temperature estimation device for a rotating electric machine, the magnet temperature estimation device comprising: a rotating electric machine configured with a rotor having a magnet and a stator having a coil; a coolant supply part configured to supply a coolant flowing from the stator toward the rotor; a magnet temperature calculation part configured to calculate a temperature of the magnet using a temperature of the coolant that has received heat from the coil; and a coolant temperature calculation part configured to calculate the temperature of the coolant that has received heat from the coil, wherein the coolant temperature calculation part acquires a heat receiving amount of the coolant that has received heat from the coil and a heat capacity of the coolant in accordance with the flow rate of the coolant, and calculates the temperature of the coolant that has received heat from the coil using the heat receiving amount of the coolant that has received heat from the coil and the heat capacity of the coolant, and wherein the magnet temperature estimation device controls the operation of the rotating electric machine based on the calculated temperature of the magnet. ### Claim 13 (depends on 12) The magnet temperature estimation device according to claim 12, wherein the magnet temperature estimation device controls the operation of the rotating electric machine based on the calculated temperature of the magnet includes controlling the transmission or power conversion of the rotating electric machine.