Position feedback control of brushless DC motors from standstill
AssigneeSeagate Technology LLC
InventorAndrew R. Motzko
Life of this patent
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Abstract
A method of, and an apparatus for, starting a brushless DC motor from standstill in a magnetic data storage system are disclosed. At least one motor position signal written on at least one magnetic disc surface is sensed. A communication state of the motor is determined as a function of the at least one sensed motor position signal. The motor is controlled based upon the determined commutation state.
Claims14
A method of starting a brushless DC motor from standstill in a magnetic data storage system, comprising:
- sensing at least one motor position signal written in a landing zone area of at least one magnetic disc surface;
- determining a commutation state of the motor as a function of the at least one sensed motor position signal;
- and
- controlling the motor based upon the determined commutation state.
The method of claim 9, wherein sensing the plurality of motor position signals from the landing zone areas of the plurality of magnetic disc surfaces using a plurality of magnetic data sensing heads further comprises sensing the plurality of motor position signals from the landing zone areas of the plurality of magnetic disc surfaces using a plurality of magnetoresistive data sensing heads, with at least one of the plurality of magnetoresistive data sensing heads corresponding to each of the plurality of magnetic disc surfaces.
A method of starting a brushless DC motor from standstill in a magnetic data storage system having a first magnetic disc surface and a second magnetic disc surface, the magnetic data storage system also having a first magnetic data head positioned adjacent the first magnetic disc surface for sensing signals from the first magnetic disc surface and a second magnetic data head positioned adjacent the second magnetic disc surface for sensing signals from the second magnetic disc surface, each of the first and second magnetic disc surfaces having a data storage area and a landing zone area, the method comprising:
- sensing a first motor position signal, written in the landing zone area of the first magnetic disc surface, using the first magnetic data head while the motor is at a standstill;
- sensing a second motor position signal, written in the landing zone area of the second magnetic disc surface, using the second magnetic data head while the motor is at a standstill;
- determining a commutation state of the motor as a function of the sensed first and second motor position signals;
- and
- controlling the motor based upon the determined commutation state.
A magnetic data storage system having a first magnetic disc and a motor coupled to the first magnetic disc for controllably spinning the first magnetic disc, the first magnetic disc having a first magnetic disc surface which includes a data storage area and a landing zone area, the magnetic data storage system also having a first magnetic data head positioned adjacent the first magnetic disc surface for sensing signals from the first magnetic disc surface, the magnetic data storage system comprising:
- motor position signals written in the landing zone area of the first magnetic disc surface, the motor position signals being indicative of a commutation state of the motor, at least one motor position signal being sensed from the landing zone area of the first magnetic disc surface by the first magnetic data head;
- means for determining the commutation state of the motor as a function of the at least one motor position signal sensed from the landing zone area of the first magnetic disc surface by the first magnetic data head;
- and
- means for controlling the motor based upon the determined commutation state .
Dependencies are inferred from the claim text.