Electrical machine, method of controlling an electrical machine, and system including an electrical machine

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:

detecting a movement of the rotor;

generating a three phase alternating current (AC) voltage signal by all phases of the electrical machine;

monitoring for a transfer speed of the electrical machine;

discontinuing the three phase AC voltage signal when the transfer speed is traversed;

switching to a back electromotive force (BEMF) control mode after discontinuing the three phase AC voltage signal.

2. The method of claim 1 , wherein detecting movement of the rotor further includes detecting a rotational speed of the rotor.

3. The method of claim 1 , wherein the three phase AC voltage signal provides an open loop ramp up of the electrical machine.

4. The method of claim 3 , wherein the three phase AC voltage signal has a predetermined magnitude and frequency.

5. The method of claim 3 , wherein the three phase AC voltage signal commutates the electrical machine from zero revolutions per minute (RPM) to the transfer speed.

6. The method of claim 1 , wherein the transfer speed includes a predetermined speed.

7. The method of claim 6 , wherein the transfer speed is about 300 RPM.

8. The method of claim 1 , wherein the BEMF control mode is a closed loop control that receives feedback for the BEMF produced by the electrical machine.

9. The method of claim 1 , wherein the electrical machine includes a permanent magnet, brushless direct current motor.

10. 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; and

a controller arranged to start the electrical machine, the controller configured to detect a movement of the rotor,

generate a three phase alternating current (AC) voltage signal by all phases of the electrical machine,

monitor for a transfer speed of the electrical machine,

discontinue the three phase AC voltage signal when the transfer speed is traversed, and

switch to a back electromotive force (BEMF) control mode after the three phase AC voltage signal is discontinued.

11. The electrical machine of claim 10 , wherein the three phase AC voltage signal provides an open loop ramp up of the electrical machine.

12. The electrical machine of claim 10 , wherein the three phase AC voltage signal has a predetermined magnitude and frequency.

13. The electrical machine of claim 10 , wherein three phase AC voltage signal commutates the electrical machine from zero RPM to the transfer speed.

14. An air movement system comprising:

a system control board;

a motor assembly including

a stator having a core and a plurality of windings, and

a 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, wherein starting includes

detecting a movement of the rotor,

generating a three phase alternating current (AC) voltage signal by all phases of the motor assembly,

discontinuing the three phase AC voltage signal when the motor assembly traverses a transfer speed.

15. The air movement system of claim 14 , wherein starting of the motor assembly further includes monitoring the transfer speed of the electrical machine.

16. The air movement system of claim 14 , wherein starting of the motor assembly further includes switching to a back electromotive force (BEMF) control mode.

17. The air movement system of claim 14 , wherein the air movement system further includes a thermostat.

18. The air movement system of claim 17 , wherein the thermostat generates signals indicative of temperature requirements which can turn on the motor assembly.

19. The air movement system of claim 17 , wherein the system control board relays signals generated by the thermostat to the motor assembly.