System and method for inducing rotation of a rotor in a sensorless motor

摘要

System and method for initiating rotation of a rotor in a motor. The motor may include the rotor and a plurality of pairs of electromagnets. A rotation period may be determined. One or more pairs of electromagnets of the plurality of pairs of electromagnets may be excited at a first excitation level. The excited one or more pairs of electromagnets may be determined based on the rotation period. The excitation level may be decreased, over a first period of time, to a second excitation level. The second excitation level may be a lower excitation level than the first excitation level. The excitation level may be increased, over a second period of time, to a third excitation level. The third excitation level may be a higher excitation level than the second excitation level. The rotation period may be decreased over the first and second periods of time.

主权项

1. A method for initiating rotation of a rotor in a motor, wherein the motor comprises the rotor and a plurality of pairs of electromagnets, the method comprising:
determining a rotation period; exciting one or more pairs of electromagnets of the plurality of pairs of electromagnets at a first excitation level, wherein the excited one or more pairs of electromagnets are determined based on the rotation period; decreasing, over a first period of time, the excitation level to a second excitation level, wherein the second excitation level is a lower excitation level than the first excitation level; increasing, over a second period of time, the excitation level to a third excitation level, wherein the third excitation level is a higher excitation level than the second excitation level; decreasing, over the first and second periods of time, the rotation period; wherein the motor is configured to use an undriven electromagnet of the plurality of pairs of electromagnets to indirectly detect a position of the rotor, wherein the indirect detection requires rotation of the rotor; wherein said exciting the one or more pairs of electromagnets, decreasing the excitation level to the second excitation level over a first period of time, increasing the excitation level to the third excitation level over a second period of time, and decreasing the rotation period over the first and second periods of time, initiate rotation of the rotor in the motor without knowledge of an exact position of the rotor.