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US 9,543,863 B1Granted
Method to eliminate current surge during spindle spin up
AssigneeMarvell International Ltd.
InventorsRavishanker Krishnamoorthy, Foo Leng Leong
Life of this patent
Estimating the term…
Abstract
Systems and methods to eliminate current surge during spindle spin up, include, in at least one aspect, a method including: using a duty cycle with a spindle motor to spin-up the spindle motor to achieve a steady-state operating speed for the spindle motor, wherein the spindle motor comprises phase windings; and using an adjusted version of the duty cycle for a period during the spin-up to reduce current surge onto a supply capacitor associated with the spindle motor during phase switching for the phase windings.
Claims16
A method comprising:
- using a duty cycle with a spindle motor to spin-up the spindle motor to achieve a steady-state operating speed for the spindle motor, wherein the spindle motor comprises phase windings;
- and
- using an adjusted version of the duty cycle for a period during the spin-up to reduce current surge onto a supply capacitor associated with the spindle motor during phase switching for the phase windings.
A method comprising:
- using a duty cycle with a spindle motor to spin-up the spindle motor to achieve a steady-state operating speed for the spindle motor, wherein the spindle motor comprises phase windings;
- and
- using an adjusted version of the duty cycle for a period during the spin-up to reduce current surge onto a supply capacitor associated with the spindle motor during phase switching for the phase windings
- wherein the duty cycle is adjusted by setting a value in a digital-to-analog converter (DAC) that provides a signal to a pulse width modulator (PWM) to control the spindle motor;
- wherein one or more DAC settings are determined before the spin-up;
- wherein the one or more DAC settings comprise various DAC settings, each of which correspond to a specific duty cycle.
3 more elements
A system comprising:
- a controller configured to connect with a spindle motor comprising phase windings;
- and
- circuitry configured to cause the controller to perform a process comprising using a duty cycle with the spindle motor to spin-up the spindle motor to achieve a steady-state operating speed for the spindle motor, and using an adjusted version of the duty cycle for a period during the spin-up to reduce current surge onto a supply capacitor associated with the spindle motor during phase switching for the phase windings.
Dependencies are inferred from the claim text.