Method for detecting stalling of an electric stepper motor, an electric stepper motor and a heating, ventilation and/or air conditioning system with an electric stepper motor
AssigneeValeo Klimasysteme GmbH
InventorsPhilippe Guyon, Daniel Garcia, Ralf Jahnig, Markus Luig
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Abstract
A Method for detecting stalling of an electric stepper motor (18), with the following steps is shown: a) samples of the voltage at a coil of the stepper motor (18) are taken continuously or in regular intervals, b) a deviation value is determined corresponding to the deviation between the measured voltages of the two samples, and c) the deviation value is used to determine whether the electric motor (18) is stalling. Further, a stepper motor and a heating, ventilation and/or air conditioning system is shown.
Claims15
A method for detecting stalling of an electric stepper motor, comprising:
- continuously or periodically obtaining a plurality of samples of a voltage at a coil of the stepper motor;
- determining a deviation value corresponding to a deviation between measured voltages of two of the plurality of obtained samples;
- and
- determining, using the deviation value whether the electric motor is stalling,
- wherein:
- each sample of the plurality of samples is an individual raw voltage value obtained from the coil of the stepper motor at a predefined time, and
- a start sample of the plurality of samples is a sample obtained after a start of a control phase and after a predetermined time interval has lapsed.
A method for detecting stalling of an electric stepper motor comprising:
- continuously or periodically obtaining a plurality of samples of a voltage at a coil of the stepper motor;
- determining a deviation value corresponding to a deviation between measured voltages of two of the plurality of obtained samples;
- determining, using the deviation value whether the electric motor is stalling;
- obtaining a first sample and defining a confirmation window of a predefined length;
- determining the deviation values for all samples within the confirmation window;
- comparing the determined deviations values with a threshold;
- and
- detecting stalling when the number of determined deviation values exceeding the threshold is greater than a predefined amount,
- wherein the first sample defines a beginning of the confirmation window.
Dependencies are inferred from the claim text.