Patent ID: 9382915
Filing Date: 2016-07-05
CPC Classification: F04B,F04D,Y02B

Claim Text:
1. A control method of a fan rotation speed, which controls the operation of a serial-connected fan set, comprising steps of: acquiring a control factor; judging whether the control factor is less than a first threshold value; executing a first control procedure, when the control factor is less than the first threshold value, wherein a rotation speed of the serial-connected fan set is not limited when the first control procedure is executed; judging whether the control factor is greater than a second threshold value when the control factor is greater than the first threshold; executing a second control procedure, when the control factor is greater than the second threshold value, wherein the second control procedure is to limit a power value of the serial-connected fan set; and executing a third control procedure, when the control factor is less than the second threshold value, wherein the third control procedure is to limit the rotation speed of the serial-connected fan set, wherein the control factor is a voltage value, a current value or the power value, and the step of acquiring the control factor is performed by reading, measurement, or calculation to obtain the control factor.