초록 ▼

A motor driver circuit for a three-phase wound disk drive spindle motor having multiple phase coils and corresponding coil drivers, and commutation phase generation means responsive to BEMF voltage zero crossings of the phase coils for generating commutation cycle control signals for the motor phase

A motor driver circuit for a three-phase wound disk drive spindle motor having multiple phase coils and corresponding coil drivers, and commutation phase generation means responsive to BEMF voltage zero crossings of the phase coils for generating commutation cycle control signals for the motor phases. The motor driver circuit comprises: a sensor for sensing a voltage level of a coil; a timing signal generator for generating successive state control signals in response to said commutation timing signals, the state control signals corresponding to successive BEMF voltage zero crossings of the phase coils, wherein a pulse generation interval is defined by a pair of successive state control signals; and a pulse generator coupled to the sensor and responsive to the state control signals, for generating a train of drive control pulses to the corresponding coil driver during each pulse generation interval for controlling current flow in the coil in response to sensed coil current levels to form a desired current waveform therein, each pulse including: (1) an ON period wherein said coil driver applies a drive current to the coil, and (2) an fixed OFF period wherein said coil driver cuts of the drive current to the coil for a fixed time interval.

대표청구항 ▼

[ What is claimed is:] [1.] In a motor driver circuit for a spindle motor having multiple phase coils and a rotor, the motor driver circuit selectively energizing one or more of the phase coils to rotate the rotor, a method of generating current waveforms for one or more of the phase coils to optima

[ What is claimed is:] [1.] In a motor driver circuit for a spindle motor having multiple phase coils and a rotor, the motor driver circuit selectively energizing one or more of the phase coils to rotate the rotor, a method of generating current waveforms for one or more of the phase coils to optimally rotate the rotor, comprising the steps of:(a) selecting an energized phase coil;(b) measuring a current level flowing through the selected coil between at least one pair of BEMF voltage zero crossings of the phase coils in each cycle of the motor; and(c) generating and applying a cyclical current waveform to the selected coil as a function of the measured current level in relation to the BEMF voltage of at least the selected coil to induce optimum torque to rotate the rotor.