Method for protecting an electric motor of a device with a motor driven consumer with a continuous capacity control system and choice of such a motor
AssigneeAtlas Copco Airpower, Naamloze Vennootschap
InventorKarel De Keyser
Life of this patent
Estimating the term…
Abstract
Method for protecting an electric motor of a motor driven consumer equipped with a controller for controlling the capacity or the power of the consumer, comprises the following steps: the determination of the thermal condition of the motor by direct measurement on the motor; and the limitation of the maximum capacity or the maximum power of the consumer as a function of the aforementioned determined thermal condition.
Claims24
A method for protecting an electric motor of a motor driven consumer equipped with a controller for controlling the capacity or the power of the consumer, wherein the method comprises the following steps:
- determining a thermal condition of the electric motor by a direct measurement on the electric motor, wherein the electric motor is provided with one or more electric windings and with one or more bearings, wherein the determining of the thermal condition of the electric motor comprises the step of measuring a temperature of one or more windings and/or of one or more bearings;
- limiting a maximum capacity or a maximum power of the consumer as a function of the thermal condition when the temperature of the one or more windings and/or of the one or more bearings is greater than a set maximum value;
- and
- setting a lower threshold value at a temperature lower than the set maximum value, wherein if the thermal condition is below the lower threshold value, the electric motor is able to be set to the maximum capacity or the maximum power.
A device for protecting an electric motor of a motor driven consumer equipped with a controller for controlling a capacity or a power of the consumer, wherein the device comprises:
- one or more sensors to determine a thermal condition of the electric motor by direct measurement on the electric motor, wherein the electric motor is provided with one or more electric windings and with one or more bearings and the one or more sensors measure a temperature of the one or more windings and/or the one or more sensors measure a temperature of one or more bearings, and
- the controller is configured to limit a maximum capacity or a maximum power of the consumer as a function of the thermal condition when the temperature of the one or more windings and/or of the one or more bearings is greater than a set maximum value and to control the electric motor to the maximum capacity or the maximum power when the thermal condition is below a lower threshold value, said lower threshold value being set lower than the set maximum value.
A device for protecting an electric motor of a motor driven consumer equipped with a controller for controlling the capacity or the power of the consumer, comprising:
- one or more first sensors for determining the thermal condition of the electric motor by a direct measurement on the electric motor, wherein the electric motor is provided with one or more electric windings and with one or more bearings and the one or more first sensors measure a temperature of the one or more windings and/or the one or more first sensors measure a temperature of one or more bearings,
- a limiter for limiting a maximum capacity or a maximum power of the consumer as a function of the thermal condition when the temperature of the one or more windings and/or of the one or more bearings is greater than a set maximum value,
- wherein the controller is configured to control the limiter and control the electric motor to the maximum capacity or the maximum power when the thermal condition is below a lower threshold value, said lower threshold value being set lower than the set maximum value, and
- wherein the electric motor is provided with cooling using a coolant and a second sensor for measuring an inlet temperature of the coolant at an input of the cooling, wherein a maximum value of a temperature difference between the measured temperature of the one or more first sensors and the inlet temperature is set, and wherein the controller is configured such that when the temperature difference reaches or exceeds the set maximum value of the difference, the controller will reduce the maximum capacity or the maximum power of the consumer.
Dependencies are inferred from the claim text.