MOTOR CONTROLLER FOR CASSETTE TAPE RECORDER, TAPE RECORDER AND CAMCORDER EMPLOYING MOTOR CONTROLLER

摘要

PURPOSE:To suppress fluctuation of torque inherent to motor and to suppress fluctuation of speed due to fluctuation of inertia moment of tape transport system. CONSTITUTION:A torque disturbance compensating means 208 suppresses disturbance of torque having influence on the motor control system. In addition, a control parameter Km in a model 208a variable with variation of the number of coil flux interlinkage due to rotation of motor is corrected according to the rotational phase angle of motor thus suppressing torque fluctuation or torque disturbance caused by high frequency torque ripple inherent to the motor. Furthermore, a control parameter Jm in a model 208b is modified according to the variation of the amount of tape wound around a rewind reel thus suppressing estimated error of torque disturbance caused by the fluctuation of inertia moment of the load.