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

Claim 5:
6. A motor control system, comprising:
a motor driver having an output for coupling to a brushed direct current (BDC) motor; and
motor control circuitry having an input for receiving a coil current signal and a motor voltage signal from the motor and having an output coupled to the motor driver, the motor control circuitry configured to generate a motor drive signal at its output comprising:
starting the motor by generating the motor drive signal to the motor driver;
in an initial time interval following the starting of the motor, detecting and counting discontinuities in the coil current signal to produce a ripple count;
during the initial time interval, generating an estimate of one or more motor parameters;
generating an historical angular frequency model estimate;
determining an angular frequency model estimate responsive to the coil current signal and motor voltage signal;
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 according to the historical angular frequency model estimate; and
adjusting the motor drive signal responsive to the compensated corrected ripple count.