Apparatus employing coil inductance determination and method for operating the apparatus
AssigneeSanofi-Aventis Deutschland GmbH
InventorsChristian Nessel, Daniel Auernhammer
Life of this patent
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Abstract
The invention relates to an apparatus having an electric motor with a stator, an armature, especially a rotor, and at least one coil, wherein the apparatus further comprises detection means configured to determine the inductance L of the coil by measuring at least one electrical quantity related to the coil during operation of the motor. The invention further relates to a method for operating such an apparatus, wherein the detection means of the apparatus determine the inductance L of the coil and/or the position of the armature as a function of the inductance L of the coil by measuring at least one electrical quantity related to the coil during operation of the motor.
Claims14
1-13. (canceled)
An apparatus,
- comprising an electric motor with a stator, an armature, especially a rotor, and at least one coil,
- wherein the apparatus further comprises detection means configured to determine the inductance L of the coil by measuring at least one electrical quantity related to the coil during operation of the motor and
- wherein the apparatus further comprises a pulse width modulation (PWM) circuitry configured to control the electric motor, wherein the PWM circuitry is configured to connect the coil to a voltage supply during charge time periods Ton and to disconnect the coil from the voltage supply during discharge time periods Toff, wherein
- the detection means are configured to determine a discharge current from the coil during discharge time periods Toff.
Dependencies are inferred from the claim text.