Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1998-08-18
1999-07-06
Masih, Karen
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318254, 318138, 318439, H02P 146
Patent
active
059201762
ABSTRACT:
A method and circuit for controlling a switched reluctance motor are provided. The method includes the steps of controlling a current in a phase coil of a motor phase of the motor during an active stage of the motor phase and controlling the current in the phase coil during an inactive stage of the motor phase. The latter step includes the substep of increasing the level of current in the phase coil for a predetermined period of time during the inactive stage of the motor phase. By increasing the current level during the inactive stage, the rate of current dissipation is reduced, thereby reducing acoustic noise. A circuit in accordance with the present invention includes a pair of one-shot circuits connected together in series and responsive to the end of the active stage of the motor phase. The second one-shot circuit generates an output signal that closes a switch connected to a phase coil of a motor phase of the motor for a predetermined period of time during the inactive stage of the motor phase. Closing the switch causes a level of current in the phase coil to increase during the inactive stage of the motor phase, thereby slowing the rate of current dissipation and reducing acoustic noise.
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"Development of a Unipolar Converter for Variable Reluctance Motor Drives", Mehrdad Ehsani, James T. Bass, Timothy J.E. Miller, and Robert L. Steigerwald, IEEE Transactions on Industry Applications, vol. IA-23, No. 3, pp. 545-552, May/Jun. 1987.
Blackburn Scott E.
Kolomeitsev Sergei F.
Dana Corporation
Masih Karen
LandOfFree
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