Drive Lifetime Extension
AssigneeNidec Control Techniques Limited
InventorMark TOWERS
Life of this patent
Estimating the term…
Abstract
A method of controlling a switching frequency of a device is disclosed, the method comprising estimating a rate of temperature ripples experienced by the device; determining the total number of temperature ripples expected over a required lifetime of the device, based on the rate of temperature ripples; determining and setting a first temperature ripple limit based on the total number of temperature ripples expected over the required lifetime of the device; and controlling a switching frequency of the device based on the first temperature ripple limit.
Claims20
A method of controlling a switching frequency of a device, the method comprising:
- estimating a rate of temperature ripples experienced by the device;
- determining the total number of temperature ripples expected over a required lifetime of the device, based on the rate of temperature ripples;
- determining and setting a first temperature ripple limit based on the total number of temperature ripples expected over the required lifetime of the device;
- and
- controlling a switching frequency of the device based on the first temperature ripple limit.
Dependencies are inferred from the claim text.