Method of adaptively controlling brushless DC motor
AssigneeDelta Electronics, Inc.
InventorsChia-Feng Wu, Chien-Sheng Lin, Jou-Sheng Wang
Life of this patent
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Abstract
A method of adaptively controlling a brushless DC motor includes steps of: controlling the brushless DC motor rotating at a first speed according to an operation curve, accumulating a running time of the brushless DC motor, estimating a remaining used time of a bearing of the brushless DC motor according to the accumulated running time, executing an alarm operation when the remaining used time is less than a predetermined time, and decreasing the speed of the brushless DC motor to run at a second speed to prolong the used time of the bearing.
Claims19
A method of controlling a brushless DC motor, comprising steps of:
- controlling the brushless DC motor rotating at a first speed according to a first relationship between a speed of the brushless DC motor and a duty cycle of a pulse-width modulation signal,
- accumulating a running time of the brushless DC motor,
- estimating a remaining used time of a bearing of the brushless DC motor according to the accumulated running time,
- executing an alarm operation when the used time reaches a predetermined time, and recording an original remaining used time, and
- decreasing the speed of the brushless DC motor to run at a second speed according to a second relationship between the speed of the brushless DC motor and the duty cycle of the pulse-width modulation signal when the alarm operation is executed to prolong the used time of the bearing by prolonging the original remaining used time to a prolonged remaining used time,
- wherein the prolonged remaining used time equals the original remaining used time multiplied by a ratio between a speed when the duty cycle is 100% in the first relationship and a speed when the duty cycle is 100% in the second relationship.
A method of controlling a brushless DC motor, comprising steps of:
- controlling the brushless DC motor rotating at a first speed according to a first relationship between a speed of the brushless DC motor and a duty cycle of a pulse-width modulation signal,
- accumulating a running time of the brushless DC motor, and estimating a remaining used time of a bearing of the brushless DC motor according to the accumulated running time,
- executing a first alarm operation when the used time reaches a first predetermined time, and recording an original remaining used time,
- decreasing the speed of the brushless DC motor to run at a second speed according to a second relationship between the speed of the brushless DC motor and the duty cycle of the pulse-width modulation signal when the alarm operation is executed to prolong the used time of the bearing by prolonging the original remaining used time to a prolonged remaining used time, wherein the prolonged remaining used time equals the original remaining used time multiplied by a ratio between a speed when the duty cycle is 100% in the first relationship and a speed when the duty cycle is 100% in the second relationship,
- continuously estimating the remaining used time according to the updated accumulated running time, and
- executing a second alarm operation when the used time reaches a second predetermined time to replace the bearing.
Dependencies are inferred from the claim text.