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US 10,879,834 B2Granted
Temperature monitoring device, temperature monitoring method, information processing program and recording medium
AssigneeOMRON Corporation
InventorsSatoshi Yamawaki, Takao Ushiyama, Kentaro Hirao
Life of this patent
Estimating the term…
Abstract
A temperature monitoring device of the present invention includes: a current value acquisition portion (50) that acquires a current value supplied for the motor; a calorific value inference portion (20) that infers a calorific value through a first thermal model indicating a relationship between the current value and a calorific value of a servo driver (2); and an anomaly judgment portion (10) that compares the calorific value with a threshold, so as to judge whether there is heating anomaly.
Claims8
A temperature monitoring device, monitoring a temperature of a motor control device that controls an action of a motor, wherein the temperature monitoring device comprises:
- a current value acquisition portion that acquires a current value supplied for the motor, wherein the temperature monitoring device is disposed in the motor control device, and the current value acquisition portion comprises a substrate portion and a current value detection resistance portion acquiring the current value according to a measured value obtained by measuring a power line through which the motor control device supplies power for the motor;
- a calorific value inference portion that infers a calorific value of the motor control device through a first thermal model as a first calorific value, the first thermal model indicating a relationship between the current value and the calorific value of the motor control device;
- and
- an anomaly judgment portion that compares the first calorific value inferred by the calorific value inference portion with a specified first threshold, so as to judge whether the motor control device has heating anomaly,
- wherein the first thermal model comprises:
- a thermal model of a relationship between the current value and a calorific value of the current value detection resistance portion in the motor control device, and a thermal model of a relationship between the current value and a calorific value of the substrate portion disposed around the current value detection resistance portion, the calorific value inference portion comprises:
- a stop time multiplication portion;
- a substrate portion thermal resistance ratio multiplication portion;
- and
- a switch,
- wherein when a speed of the motor is below a specified value, the switch is controlled to connect the thermal resistance ratio multiplication portion with the stop time multiplication portion, to obtain a calorific value of the substrate portion by multiplying a calorific value worked out according to a current value in the stop time multiplication portion by a substrate portion thermal resistance ratio.
8 more elements
A temperature monitoring method, comprises:
- disposing a temperature monitoring device in a motor control device that controls an action of a motor, wherein the temperature monitoring device monitors a temperature of the motor control device, the temperature monitoring device comprises a substrate portion and a current value detection resistance portion;
- a current value acquisition step of acquiring a current value supplied for the motor by using the substrate portion and the current value detection resistance portion according to a measured value obtained by measuring a power line through which the motor control device supplies power for the motor;
- a calorific value inference step of inferring a calorific value of the motor control device through a first thermal model as a first calorific value, the first thermal model indicating a relationship between the current value and the calorific value of the motor control device;
- an anomaly judgment step of comparing the first calorific value inferred in the calorific value inference step with a specified first threshold, so as to judge whether the motor control device has heating anomaly,
- wherein the first thermal model comprises:
- a thermal model of a relationship between the current value and a calorific value of the current value detection resistance portion in the motor control device, and a thermal model of a relationship between the current value and a calorific value of the substrate portion disposed around the current value detection resistance portion, the calorific value inference step comprises a step of, when a speed of the motor is below a specified value, controlling a switch to connect a thermal resistance ratio multiplication portion with a stop time multiplication portion to obtain a calorific value of the substrate portion by multiplying a calorific value worked out according to a current value in the stop time multiplication portion by a substrate portion thermal resistance ratio.
3 more elements
A non-transitory storage medium storing an information processing program, for causing a computer to function as the temperature monitoring device which monitors a temperature of a motor control device that controls an action of a motor, wherein the information processing program is configured to implement steps comprising:
- a current value acquisition step of acquiring a current value supplied for the motor by using a substrate portion and a current value detection resistance portion according to a measured value obtained by measuring a power line through which the motor control device supplies power for the motor, wherein the temperature monitoring device is disposed in the motor control device, and the temperature monitoring device comprises the substrate portion and the current value detection resistance portion;
- a calorific value inference step of inferring a calorific value of the motor control device through a first thermal model as a first calorific value, the first thermal model indicating a relationship between the current value and the calorific value of the motor control device;
- an anomaly judgment step of comparing the first calorific value inferred in the calorific value inference step with a specified first threshold, so as to judge whether the motor control device has heating anomaly,
- wherein the first thermal model comprises:
- a thermal model of a relationship between the current value and a calorific value of the current value detection resistance portion in the motor control device, and a thermal model of a relationship between the current value and a calorific value of the substrate portion disposed around the current value detection resistance portion, the calorific value inference step comprises a step of, when a speed of the motor is below a specified value, controlling a switch to connect a thermal resistance ratio multiplication portion with a stop time multiplication portion to obtain a calorific value of the substrate portion by multiplying a calorific value worked out according to a current value in the stop time multiplication portion by a substrate portion thermal resistance ratio.
2 more elements
Dependencies are inferred from the claim text.