Method of updating a thermal model of an electric motor
AssigneeABB Schweiz AG
InventorsPanagiotis Kakosimos, Olli Alkkiomäki, Zlatko Kolondjovski
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Abstract
A method of updating a thermal model describing the thermal behaviour of an electric motor having a stator provided with stator windings, the method including: a) injecting a current into the stator windings to heat the stator windings, b) obtaining temperature measurements over time from each of a plurality of temperature sensors distributed in the electric motor while step a) is being performed and the stator windings are heating up, or after step a) has been terminated or the current has been decreased, and the electric motor is cooling down, and c) updating parameter values of the thermal model based on the temperature measurements.
Claims15
A method of updating a thermal model describing the thermal behavior of an electric motor having a stator provided with stator windings, the method comprising:
- a) injecting a DC current into the stator windings to heat the stator windings until a predetermined thermal non-equilibrium condition is reached, after which the current injection is terminated or decreased,
- b) obtaining temperature measurements over time from each of a plurality of temperature sensors distributed in the electric motor while the stator windings are heating up in step a), or after the current has been terminated or decreased, and the electric motor is cooling down, and
- c) updating parameter values of the thermal model based on the temperature measurements.
A control system for updating a thermal model describing the thermal behavior of an electric motor having a stator provided with stator windings, wherein the control system is configured to perform a method comprising:
- a) injecting a DC current into the stator windings to heat the stator windings until a predetermined thermal non-equilibrium condition is reached, after which the current injection is terminated or decreased,
- b) obtaining temperature measurements over time from each of a plurality of temperature sensors distributed in the electric motor while the stator windings are heating up in step a), or after the current has been terminated or decreased, and the electric motor is cooling down, and
- c) updating parameter values of the thermal model based on the temperature measurements.
An electric motor assembly comprising:
- an electric motor having:
- a stator provided with stator windings, and
- a plurality of temperature sensors distributed in the electric motor;
- and
- a control system for updating a thermal model describing the thermal behavior of the electric motor;
- wherein the control system is configured to perform a method including the steps:
- a) injecting a DC current into the stator windings to heat the stator windings until a predetermined thermal non-equilibrium condition is reached, after which the current injection is terminated or decreased,
- b) obtaining temperature measurements over time from each of a plurality of temperature sensors distributed in the electric motor while the stator windings are heating up in step a), or after the current has been terminated or decreased, and the electric motor is cooling down, and
- c) updating parameter values of the thermal model based on the temperature measurements;
- and
- wherein the control system is configured to receive temperature measurements from the temperature sensors.
Dependencies are inferred from the claim text.