Patent ID: 8791657

Claim:
A spindle motor circuit comprising: A. a power lead and a common lead; B. first, second, and third spindle motor coil leads and a fourth spindle motor common lead; C. a first drive circuit coupled between the power lead and the common lead, and having a first driver output coupled to the first spindle motor coil lead; D. a second drive circuit coupled between the power lead and the common lead, and having a second driver output coupled to the second spindle motor coil lead; E. a third drive circuit coupled between the power lead and the common lead, and having a third driver output coupled to the third spindle motor coil lead; and F. a damping circuit having four resistors and four switches, each resistor having one end and another end and the one ends of the four resistors being connected together: i. a first switch selectively connecting the first spindle motor coil lead to the another end of a first resistor, ii. a second switch selectively connecting the second spindle motor coil lead to the another end of a second resistor, iii. a third switch selectively connecting the third spindle motor coil lead to the another end of a third resistor, and iv. a fourth switch selectively connecting the fourth spindle motor common lead to the another end of a fourth resistor.