Mattingly, Stanger Malur & Brundidge PC
Drive control device of motor and disk rotation system
A drive control device of a DC brushless multi-phase motor performs the speed control of the motor in place microprocessor, the burden on the microprocessor is relieved. The drive control device detects a zero crossing point of the back electromotive force in the non-energizing phase to perform the energizing switching to the coils by the PLL control, and includes a current detection circuit that detects currents flowing through the coils to perform the speed control of the motor based on the detected currents. The drive control device also, compares outputs from speed error detection circuit with outputs from the current detection circuit to determine the currents to be made to flow through the coils, and thereby controls the current output circuit.
Renesas Technology Corp.
G
G11B
inventional
Kenji Kichiya Hiroshi
Yoshida Itagaki Sato