Motor starting method and apparatus

Details Motor starting method and apparatus Motor starting method and apparatus

1993-08-19

1995-05-23

Shoop, Jr., William M.

Electricity: motive power systems

Armature circuit control

Plural, diverse or diversely controlled, armature or primary...

318718, 318799, 318 83, H02P 506

Patent

active

054184363

ABSTRACT:
A method for starting and operating an electric motor such as the spindle motor of a disk drive assembly employs a segmented stator winding. On startup, the winding segments are connected in series in order to maximize torque. Motor speed is detected, and when a predetermined speed is reached, the segments are connected in parallel to reduce the effective number of winding turns and maintain a control voltage for motor speed control. Switching of the winding segments can be by active elements such as FETs or by passive reactive elements responding directly to motor speed. For more gradual motor torque constant control, the winding may have more than two segments.

REFERENCES:
patent: 2613343 (1952-10-01), Ober
patent: 3683247 (1972-08-01), Reimers
patent: 4724366 (1988-02-01), Neesz
patent: 5289097 (1994-02-01), Erickson et al.

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