Patent ID: 11936325
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. Motor control circuitry configured to generate a motor drive signal at an output comprising:
starting the generating of the motor drive signal;
receiving, at one or more inputs, a coil current signal and a motor voltage signal from a brushed direct current (BDC) motor;
in an initial time interval following the starting of the motor, detecting discontinuities in a coil current sensed at the motor to produce a ripple count of the detected discontinuities;
during the initial time interval, generating an estimate of one or more motor parameters responsive to the motor voltage signal and to one or more of an angular velocity and acceleration of the motor;
generating an historical angular frequency model estimate from a behavioral motor model incorporating the estimated motor parameters;
after the generating of the estimate of the motor parameters and while applying electrical drive to the motor, determining an angular frequency model estimate responsive to the coil current signal and the motor voltage signal, using a computational model for the motor incorporating the estimated motor parameters;
generating a corrected ripple count responsive to a comparison of a commutation angle of the motor with an angular position based on the angular frequency model estimate;
compensating the corrected ripple count based on the historical angular frequency model estimate; and
adjusting the motor drive signal responsive to the compensated corrected ripple count.