Close coupled adapter for a generator set
An adapter is used to couple a prime mover body to a housing of a generator. The adapter has openings that allow an armature of the generator to be attached to the flywheel of the prime mover. The adapter provides a torque coupling between the prime mover and the generator so that the attachments of the prime mover and generator to the skid, as well as the skid itself, can be reduced in size and weight because they no longer need to oppose the prime mover-generator torque load. A thickness of the adapter and a pattern of the openings in the body of the adapter are selected to move any natural resonance frequencies of the adapter outside an operating frequency of the prime mover.
1. A close coupled adapter for use in a generator set having a prime mover that drives a generator, the close coupled adapter comprising:
a front mounting ring adapted for mechanical attachment to a prime mover housing;
a back mounting ring adapted for mechanical attachment to a generator housing; and
a sidewall having a cylinder-shape coupled between the front mounting ring and the back mounting ring, the sidewall having a plurality of three or fewer sided apertures that accommodate access to an interior space of the close coupled adapter via one of the apertures.
2. The close coupled adapter of claim 1 , further comprising an alignment lip on the front mounting ring that engages the prime mover housing to align an armature shaft of the generator to a flywheel coupling of the prime mover.
3. The close coupled adapter of claim 1 , having mutually exclusive front and back mounting hole patterns in the front mounting ring and the back mounting ring, respectively.
4. The close coupled adapter of claim 1 , having a sidewall thickness and aperture pattern having a natural resonance frequency outside a range of operating speeds of the prime mover.
5. A generator set comprising:
a skid;
a prime mover mechanically attached to the skid, the prime mover including a body and a flywheel coupling;
a generator mechanically attached to the skid, the generator including a housing and an armature coupling; and
a close coupled adapter that directly connects between the body of the prime mover and the housing of the generator, the close coupled adapter including:
a front mounting ring adapted for mechanical attachment to the body of the prime mover;
a back mounting ring adapted for mechanical attachment to the housing of the generator; and
a sidewall having a cylinder-shape coupled between the front mounting ring and the back mounting ring, the sidewall having a plurality of apertures, each with three or fewer sides that accommodate access to an interior space of the close coupled adapter via one of the plurality of apertures.
6. The generator set of claim 5 , wherein the close coupled adapter includes an alignment lip on the front mounting ring that mates with a corresponding feature of the body of the prime mover to align the armature coupling with the flywheel.
7. The generator set of claim 5 , having mutually exclusive front and back mounting hole patterns that only align with corresponding mounting holes on the body of the prime mover for the front mounting ring and the housing of the generator for the back mounting ring.
8. The generator set of claim 5 , wherein a sidewall composition and thickness and a pattern of the plurality of apertures is selected to avoid a natural resonance frequency over a range of operating speeds of the prime mover.