# US 2019/0377031 A1 · Motor driving device and detection method for detecting malfunction in heat radiation performance of heatsink

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- Number: US 2019/0377031 A1
- Document ID: US20190377031A1
- Status: Published application
- Kind: A1
- Application number: 16/549,207
- Filed: 2019-08-23
- Published: 2019-12-12
- Earliest claimed: 2015-07-21
- Assignees: Fanuc Corporation
- Applicants: Fanuc Corporation
- Inventors: Genzo Naito; Kazuhiro Yamamoto
- Web page: https://patentgrep.com/patent/US20190377031A1

## CPC

- G01R 31/40: Testing power supplies (testing photovoltaic devices H02S50/10)
- F28F 3/02: Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations (F28F3/08 takes precedence)
- F28F 27/00: Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus (control arrangements in general G05)
- H05K 7/20909: {Forced ventilation, e.g. on heat dissipaters coupled to components}
- H05K 7/20945: {Thermal management, e.g. inverter temperature control}
- F28F 2200/00: Prediction; Simulation; Testing
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A motor driving device capable of reliably detecting a malfunction in the performance of a heatsink. The motor driving device includes a heat generating element, a heatsink, an electric power detecting part for detecting a consumed power of the heat generating element, a temperature detecting part for detecting a temperature of the motor driving device, a temperature change calculating part for calculating, as a detected valuation, an amount of change in the temperature within a predetermined time, a reference determination part for determining a reference amount of change in the temperature based on the temperature and the consumed power, and a temperature change judging part for comparing the reference amount of change with the detected amount of change, and judges whether the detected change is different from the reference change.

## Claims

### Claim 1

A motor driving device comprising:
a heat generating element;
a heatsink which cools the heat generating element;
an electric power detecting part which detects a consumed power of the heat generating element;
a temperature detecting part which detects a temperature of the motor driving device;
a temperature change calculating part which calculates an amount of change in the temperature within a predetermined time as a detected amount of change, based on the temperature detected by the temperature detecting part;
a reference determination part which determines a reference amount of change in the temperature, based on the temperature detected by the temperature detecting part and on the consumed power detected by the electric power detecting part;
a temperature change judging part which compares the reference amount of change determined by the reference determination part with the detected amount of change calculated by the temperature change calculating part, and judges whether the detected amount of change is different from the reference amount of change; and
a steady state judging part which judges whether a temperature change of the motor driving device is in a steady state, wherein
the temperature change calculating part calculates the detected amount of change when the steady state judging part judges that the temperature change of the motor driving device is not in a steady state.

### Claim 2 (depends on 1)

The motor driving device according to claim 1, wherein the steady state judging part judges that the temperature change of the motor driving device is in a steady state when the consumed power is constant for a predetermined period of time.

### Claim 3 (depends on 1)

The motor driving device according to claim 1, further comprising:
a thermal resistance calculating part which calculates a thermal resistance of the motor driving device based on the consumed power and the temperature detected by the temperature detecting part when the steady state judging part judges that the temperature change of the motor driving device is in a steady state; and
a thermal resistance judging part which judges whether the thermal resistance calculated by the thermal resistance calculating part is different from a predetermined reference thermal resistance.