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US 2013/0257342 A1Published application
System and Method to Allow a Synchronous Motor to Successfully Synchronize with Loads that Have High Inertia and/or High Torque
AssigneeBaldor Electric Company
InventorMichael J. Melfi
Life of this patent
Estimating the term…
Abstract
A mechanical soft-start type coupling is used as an interface between a line start, synchronous motor and a heavy load to enable the synchronous motor to bring the heavy load up to or near synchronous speed. The soft-start coupling effectively isolates the synchronous motor from the load for enough time to enable the synchronous motor to come up to full speed. The soft-start coupling then brings the load up to or near synchronous speed.
Claims22
A method comprising:
- accessing a line-start synchronous motor;
- accessing a soft-start coupling;
- and
- operatively coupling the soft-start coupling to the synchronous motor and a load;
- wherein the load has characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the coupling being operatively connected to the motor shaft and the load;
- and
- wherein the synchronous motor is sufficiently rated to obtain synchronous operation and to drive the load at least near synchronous speed during normal steady state operation of the motor when the soft-start coupling is operatively connected to the motor shaft and the load.
4 more elements
A method comprising:
- providing a line-start, synchronous motor;
- providing a soft-start coupling;
- and
- operatively coupling the soft-start coupling to the synchronous motor and a load;
- wherein the soft-start coupling allows the synchronous motor to attain synchronous speed nearly immediately after starting of the motor with the motor operatively connected to the load;
- wherein the load has characteristics sufficient to prevent normal starting including synchronization of the motor when the motor is operatively connected to the load in the absence of the coupling being operatively connected to the motor shaft and the load;
- and
- wherein the synchronous motor is sufficiently rated to obtain synchronous operation and to drive the load from start to at least near synchronous speed during normal steady state operation of the motor when the coupling is operatively connected to the motor shaft and the load.
5 more elements
A method comprising:
- providing a line-start permanent magnet synchronous motor;
- providing a coupling comprising:
- a coupling housing with a coupling center axis aligned with a motor central axis, the coupling housing having an axial cross-section that tapers toward a periphery of the coupling housing, the housing having an interior partially filled with a dry fluid, the housing having an opening aligned with the coupling center axis;
- a hub having a center axis aligned with the coupling center axis, the hub having an extension portion extending along the hub center axis and through the coupling housing opening into the housing interior, the extension portion having a rotor assembly extending radially outward in the coupling housing interior for rotation within the coupling housing interior, and
- operatively connecting the coupling housing to a shaft of the motor;
- and
- operatively connecting the coupling to a load:
- wherein the load is sufficient to prevent the motor from immediately attaining synchronous speed after starting of the motor in the absence of the coupling being operatively connected to the motor shaft;
- and
- wherein the synchronous motor is sufficiently rated to obtain synchronous operation and to drive the load from start to at least near synchronous speed during normal steady state operation of the motor when the coupling is operatively connected to the motor shaft and the load.
7 more elements
Dependencies are inferred from the claim text.