Electricity: motive power systems – Plural diverse motor controls – Acceleration control
Reexamination Certificate
2006-04-04
2006-04-04
Ip, Paul (Department: 2837)
Electricity: motive power systems
Plural diverse motor controls
Acceleration control
C318S560000, C318S561000, C360S070000, C360S073030
Reexamination Certificate
active
07023155
ABSTRACT:
Method and apparatus for accelerating a multi-phase motor having a rotatable rotor is disclosed. A first commutation state in which the rotor resides is identified, a first position of the rotor within the first commutation state is determined (preferably within one to two electrical degrees), and a travel distance for the rotor to advance from the first position to a second position is determined. An optimized activation time is next determined for utilizing substantially all available motor torque, and a first drive pulse is applied for the activation time to advance the rotor to the second position. The process is repeated until an intermediate velocity is reached, after which back electromotive force (bemf) commutation is used for control of the motor. The apparatus includes a controller programmed with routines that utilize speeds and accelerations of the motor in accordance with basic Newtonian laws to determine optimized activation times.
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Berger Derek J.
Ip Paul
Lucente David K.
Seagate Technology LLC
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