A method of controlling an electrical machine. The electrical machine includes a stator having a core and a plurality of windings, and a rotor disposed adjacent to the stator to interact with the stator. The method includes configuring an amplitude value and frequency values of a three-phase alterna
A method of controlling an electrical machine. The electrical machine includes a stator having a core and a plurality of windings, and a rotor disposed adjacent to the stator to interact with the stator. The method includes configuring an amplitude value and frequency values of a three-phase alternating current (AC) voltage startup signal having an amplitude and a frequency, providing the three-phase alternating current (AC) voltage startup signal to the plurality of windings, and altering the frequency of the three-phase AC voltage startup signal according to a preprogrammed frequency ramp function defined by the frequency values. The method further includes discontinuing the three-phase AC voltage startup signal after the frequency ramp function has completed, and switching to a back electromotive force (BEMF) control mode after discontinuing the three-phase AC voltage startup signal.
대표청구항▼
1. A method of controlling an electrical machine including a stator having a core and a plurality of windings, and a rotor disposed adjacent to the stator to interact with the stator, the method comprising: configuring an amplitude value and frequency values of a three-phase alternating current (AC)
1. A method of controlling an electrical machine including a stator having a core and a plurality of windings, and a rotor disposed adjacent to the stator to interact with the stator, the method comprising: configuring an amplitude value and frequency values of a three-phase alternating current (AC) voltage startup signal having an amplitude and a frequency, the three-phase (AC) voltage startup signal being distorted from a sinusoidal voltage;providing the three-phase AC voltage startup signal to the plurality of windings resulting in a substantially sinusoidal current;altering the frequency of the three-phase AC voltage startup signal according to a frequency ramp function defined by the frequency values, wherein the three-phase AC voltage startup signal provides an open loop ramp up of the electrical machine;discontinuing the three-phase AC voltage startup signal when the frequency ramp function has completed;switching to a back electromotive force (BEMF) control mode, when discontinuing the three-phase AC voltage startup signal, by using a known estimated position of the rotor based on the frequency ramp function. 2. The method of claim 1, wherein the configuring an amplitude value and frequency values includes configuring amplitude values of the three-phase AC startup signal, and wherein the method further comprises altering the amplitude of the three-phase AC voltage startup signal according to an amplitude ramp function defined by the amplitude values, wherein discontinuing the three-phase AC voltage startup signal occurs after the amplitude ramp function has completed. 3. The method of claim 2, wherein the altering the amplitude, the altering the frequency, or both includes linearly increasing the amplitude, the frequency, or both of the three-phase AC voltage startup signal. 4. The method of claim 2, wherein the altering the amplitude, the altering the frequency, or both includes exponentially increasing the amplitude, the frequency, or both of the three-phase AC voltage startup signal. 5. The method of claim 1, further comprising detecting a movement of the rotor prior to providing the three-phase AC voltage startup signal to the plurality of windings. 6. The method of claim 5, wherein detecting movement of the rotor further includes detecting a rotational speed of the rotor. 7. The method of claim 1, wherein switching to the BEMF control mode occurs instantaneously when discontinuing the three-phase AC voltage startup signal. 8. The method of claim 1, further comprising preventing the rotor from coasting during execution of the method. 9. The method of claim 1, wherein altering the frequency includes linearly increasing the frequency of the three-phase AC voltage startup signal. 10. The method of claim 1, wherein altering the frequency includes exponentially increasing the frequency of the three-phase AC voltage startup signal. 11. An electrical machine comprising: a stator having a core and a plurality of windings;a rotor disposed adjacent to the stator to interact with the stator;a memory; anda controller arranged to start the electrical machine, the controller configured to obtain a preprogrammed amplitude value and preprogrammed frequency values of a three-phase alternating current (AC) voltage startup signal having an amplitude and a frequency, the three-phase (AC) voltage startup signal being distorted from a sinusoidal voltage,generate the three-phase AC voltage startup signal to be provided to the plurality of windings resulting in a substantially sinusoidal current,alter the frequency of the three-phase AC voltage startup signal according to a frequency ramp function defined by the frequency values, wherein the three-phase AC voltage startup signal provides an open loop ramp up of the electrical machine,discontinue the three-phase AC voltage startup signal when the frequency ramp function has completed, andswitch to a back electromotive force (BEMF) control mode, using a known estimated position of the rotor based on the frequency ramp function, when the three-phase AC voltage startup signal is discontinued. 12. The electrical machine of claim 11, wherein the controller is further configured to alter the amplitude of the three-phase AC voltage startup signal according to an amplitude ramp function defined by a plurality of amplitude values, anddiscontinue the three-phase AC voltage startup signal after when the amplitude ramp function has completed. 13. The electrical machine of claim 12, wherein at least one of the amplitude ramp function and the frequency ramp function linearly increases in value. 14. The electrical machine of claim 12, wherein at least one of the amplitude ramp function and the frequency ramp function exponentially increases in value. 15. The electrical machine of claim 11, wherein the controller is further configured to detect a movement of the rotor before the controller generates the three-phase AC voltage startup signal. 16. The electrical machine of claim 11, wherein the BEMF control mode is a closed loop control mode that receives feedback for the BEMF produced by the electrical machine. 17. The electrical machine of claim 11, wherein the electrical machine includes a permanent magnet, brushless direct current motor. 18. The electrical machine of claim 11, wherein the frequency ramp function linearly increases in value. 19. The electrical machine of claim 11, wherein the frequency ramp function exponentially increases in value. 20. An air movement system comprising: a system control board;a motor assembly including a stator having a core and a plurality of windings, anda rotor disposed adjacent to the stator to interact with the stator,a drive circuit coupled to the motor assembly and having a controller and a memory, the controller being configured to start the motor assembly and receive a preprogrammed amplitude value and preprogrammed frequency values of a three-phase alternating current (AC) voltage startup signal having an amplitude and a frequency, the three-phase (AC) voltage startup signal being distorted from a sinusoidal voltage, wherein the controller starts the motor assembly by being further configured to provide the three-phase AC voltage startup signal to the plurality of windings resulting in a substantially sinusoidal current;alter the frequency of the three-phase AC voltage startup signal according to a frequency ramp function defined by the frequency values, wherein the three-phase AC voltage startup signal provides an open loop ramp up of the electrical machine;discontinue the three-phase AC voltage startup signal when the frequency ramp function has completed;switch to a back electromotive force (BEMF) control mode, when discontinuing the three-phase AC voltage startup signal, by using a known estimated position of the rotor based on the frequency ramp function. 21. The air movement system of claim 20, wherein the controller is further configured to alter the amplitude of the three-phase AC voltage startup signal according to an amplitude ramp function defined by a plurality of amplitude values, anddiscontinue the three-phase AC voltage startup signal after the amplitude ramp function has completed. 22. The air movement system of claim 20, wherein the controller is further configured to detect a movement of the rotor before the controller provides the three-phase AC voltage startup signal to the plurality of windings. 23. The air movement system of claim 20, wherein the air movement system further includes a thermostat.
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