DC Motor Start Algorithm
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
The DC brushless spindle motor of a rigid magnetic disk data file requires efficient acceleration control to provide high initial acceleration to quickly fly the transducer heads for minimal head-disk wear while using a limited amount of power supply current. The average power supply current delivered to the motor increases with speed if the current flowing in the motor is held at a constant value. In a typical motor a motor current may be set to a value such as five amperes and maintained until the transducer heads are flying safely above the disk surfaces. In a typical case, a speed of about 80 radians per second is required and a speed of 120 radians per second can be attained without exceeding a safe motor current value.