US 7,023,155 B2 · Spindle motor acceleration control

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.

Claims17

Dependent claims

A method comprising:

modeling a response of a selected pair of motor windings to a sense pulse to determine a first position of a rotor within a first commutation state;
deriving an optimized drive pulse activation time used to accelerate the rotor across a first travel distance from the first position to a second position while utilizing substantially all available torque;
and
applying a first drive pulse to the motor for the optimized drive pulse activation time to accelerate the rotor to the second position.

1 more element

Dependencies are inferred from the claim text.

Spindle motor acceleration control

Life of this patent

Spindle motor acceleration control

Life of this patent

Abstract

Claims17