Motor speed controller
First Claim
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1. A method of controlling a motor, the method comprising:
- intentionally cutting a voltage to the motor;
measuring an electromotive force (EMF) of the motor at a predetermined time after the intentionally cutting of the voltage to the motor; and
comparing the measured electromotive force (EMF) to a table,wherein the motor is an AC single phase inductive motor.
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Abstract
A motor speed controller and a method of controller a speed of a motor are provided. The system and method include a motor and a motor controller that monitors operation of the motor based on electromotive force (EMF) conditions of the motor. The motor controller cuts a voltage to the motor, measures an electromotive force (EMF) of the motor at a predetermined time after the cutting of the voltage to the motor, and compares the measured electromotive force (EMF) to a table.
72 Citations
33 Claims
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1. A method of controlling a motor, the method comprising:
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intentionally cutting a voltage to the motor; measuring an electromotive force (EMF) of the motor at a predetermined time after the intentionally cutting of the voltage to the motor; and comparing the measured electromotive force (EMF) to a table, wherein the motor is an AC single phase inductive motor. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 23)
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5. A method of controlling a motor, the method comprising:
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intentionally cutting a voltage to the motor; measuring an electromotive force (EMF) of the motor at a predetermined time after the intentionally cutting of the voltage to the motor; and comparing the measured electromotive force (EMF) to a table, wherein the table includes a threshold value, wherein the threshold value includes a first threshold for a high speed mode, and wherein the threshold value includes a second threshold for a low speed mode. - View Dependent Claims (29)
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16. A method of controlling a motor, the method comprising:
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periodically intentionally cutting a voltage to the motor; measuring an electromotive force (EMF) of the motor at a predetermined period of time after the intentionally cutting of the voltage to the motor; and comparing the measured electromotive force (EMF) to a table to determine if the motor is operating properly, wherein, if the motor is determined to be operating properly, the method includes outputting a first signal and turning the voltage to the motor back on, and wherein, if the motor is determined to be operating improperly, the method includes outputting a second signal, wherein the motor is an AC single phase inductive motor. - View Dependent Claims (27, 30)
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17. A sensorless motor speed controller system comprising:
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a motor; and a motor controller that monitors operation of the motor based on electromotive force (EMF) conditions of the motor at a predetermined time after an intentional cutting of a voltage to the motor, wherein the motor is an AC single phase inductive motor. - View Dependent Claims (18, 19, 20, 21, 25, 31, 32)
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22. A sensorless motor speed controller that monitors operation of a motor based on electromotive force (EMF) conditions of the motor, the sensorless motor speed controller comprising:
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a microcontroller that intentionally cuts a voltage to the motor; and a speed sensing module that measures the electromotive force (EMF) of the motor at a predetermined time after the microcontroller intentionally cuts the voltage to the motor, wherein the microcontroller receives the measured electromotive force (EMF) from the speed sensing module and compares the measured electromotive force (EMF) to a table, wherein the motor is an AC single phase inductive motor. - View Dependent Claims (26)
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24. A method of controlling a motor, the method comprising:
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periodically cutting a voltage to the motor; measuring an electromotive force (EMF) of the motor at a predetermined period of time after the cutting of the voltage to the motor; comparing the measured electromotive force (EMF) to a table to determine if the motor is operating properly, wherein, if the motor is determined to be operating properly, the method includes outputting a first signal and turning the voltage to the motor back on, and wherein, if the motor is determined to be operating improperly, the method includes outputting a second signal; and measuring the predetermined time after the cutting of the voltage to the motor, wherein the motor is an AC single phase inductive motor. - View Dependent Claims (33)
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28. A method of controlling a motor, the method comprising:
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intentionally cutting a voltage to the motor; measuring an electromotive force (EMF) of the motor at a predetermined time after the intentionally cutting of the voltage to the motor; and comparing the measured electromotive force (EMF) to a table, wherein the motor is an AC single phase inductive motor, wherein the table is specific to the AC single phase inductive motor being used, the method further comprising determining one of; whether the AC single phase inductive motor was running at a time of the intentionally cutting of the voltage to the AC single phase inductive motor based on the comparison of the measured electromotive force (EMF) to the table, a speed of the AC single phase inductive motor at a time of the intentionally cutting of the voltage to the AC single phase inductive motor based on the comparison of the measured electromotive force (EMF) to the table, and whether the AC single phase inductive motor is operating below a predetermined or threshold value at a time of the intentionally cutting of the voltage to the AC single phase inductive motor based on the comparison of the measured electromotive force (EMF) to the table.
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Specification