US Patent No. 10,461,676

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


Patent No. 10,461,676
Issue Date October 29, 2019
Title 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
Inventorship Philippe Guyon, Creteil (FR)
Daniel Garcia, Creteil (FR)
Ralf Jahnig, Bad Rodach (DE)
Markus Luig, Bad Rodach (DE)
Assignee VALEO KLIMASYSTEME GMBH, Bad Rodach (DE)

Claim of US Patent No. 10,461,676

1. 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.