초록 ▼

An electric motor having a reverse air flow cooling system that eliminates the need to extend lead wires past the fan. The electric motor includes a fan positioned on the lead-end of the motor to move air through a housing of the electric motor in a direction generally defined from the shaft-end of

An electric motor having a reverse air flow cooling system that eliminates the need to extend lead wires past the fan. The electric motor includes a fan positioned on the lead-end of the motor to move air through a housing of the electric motor in a direction generally defined from the shaft-end of the motor to the lead-end of the motor. Lead wires can extend from the stator windings radially through the housing for connection to an electric start switch. The electric start switch can be positioned in a control box that is coupled to the housing. The electric start switch can be operable to remove an auxiliary circuit from a stator circuit after startup of the electric motor.

대표청구항 ▼

1. An electric motor comprising:a housing comprising a first end, a second end, a first aperture defined in the first end of the housing, and a second aperture defined in the housing between the first and second ends of the housing; a stator fixed relative to the housing, the stator comprising a sta

1. An electric motor comprising:a housing comprising a first end, a second end, a first aperture defined in the first end of the housing, and a second aperture defined in the housing between the first and second ends of the housing; a stator fixed relative to the housing, the stator comprising a stator circuit comprising a main circuit and an auxiliary circuit; a shaft rotatable relative to the housing and extending through the first aperture for connection to a load; a rotor connected to the shaft for rotation with the shaft relative to the stator; a fan connected to the shaft for rotation with the shaft, the fan being connected to the shaft between the second end and the rotor, the fan being configured to pull air in a direction generally defined from the first end to the fan; a control box coupled to the housing adjacent the second aperture and configured to house a plurality of control components utilized in the control and operation of the electric motor, the plurality of control components comprising an electric start switch, the electric start switch operable to remove the auxiliary circuit from the stator circuit after startup of the electric motor; and lead wires electrically connecting the stator circuit and at least some of the plurality of control components, the lead wires extending through the second aperture and into the control box, the second aperture being positioned axially between the fan and the first end of the housing. 2. An electric motor according to claim 1 wherein the auxiliary circuit comprises an auxiliary winding and a capacitor, and wherein the plurality of control components further comprises the capacitor.3. An electric motor according to claim 1 wherein the housing further comprises a first end frame positioned at the first end of the housing, a second end frame positioned at the second end of the housing, and a generally cylindrical body connecting the first and second end frames, wherein the first and second end frames each support a bearing that supports the shaft for rotation about a shaft axis, wherein the first aperture is defined in the first end frame, and wherein the second aperture is defined in the generally cylindrical body.4. An electric motor according to claim 3 wherein the control box further comprises a contoured surface sized to substantially match an outer surface of the generally cylindrical body.5. An electric motor according to claim 1 wherein the control box is secured to the housing using a single threaded fastener.6. An electric motor according to claim 1 wherein the stator further comprises a second stator circuit comprising a second main circuit and a second auxiliary circuit, wherein the second stator circuit is of a permanent-split-capacitor design.7. An electric motor according to claim 1 wherein the electric motor is an induction motor.8. An electric motor according to claim 1 wherein the electric motor is configured for use in a jetted tub application, and where the load is a fluid pump.9. An electric motor according to claim 1 wherein the housing defines a plurality of air vents, and wherein the air vents are positioned substantially radially outward of the fan.10. An electric motor according to claim 9 wherein the control box is positioned at least partially between the plurality of air vents and the first end of the housing.11. An electric motor according to claim 1 wherein the electric motor further comprises a baffle configured to substantially prevent water entering the plurality of air vents from contacting the stator, and wherein the baffle is positioned at least partially between the fan and the rotor.12. An electric motor according to claim 1 wherein the control box comprises a plurality of power cord inlet options.13. An electric motor according to claim 1 wherein the electric motor comprises an ambient operating specification of at least approximately 70 degrees Celsius.14. An electric motor comprising:a housing comprising a first end frame, a second end frame, a body connecting the first end frame and the second end frame, a shaft aperture defined in the first end frame, a lead wire aperture defined in the body, and a plurality of air vents defined in the body; a stator fixed relative to the housing, the stator comprising a stator circuit comprising a main circuit and an auxiliary circuit, the main circuit comprising a main winding, the auxiliary circuit comprising an auxiliary winding and a capacitor; a shaft rotatable relative to the housing and extending through the shaft aperture for connection to a load, the shaft being supported for rotation about a shaft axis by a first bearing supported by the first end frame and a second bearing supported by the second end frame; a rotor connected to the shaft for rotation with the shaft relative to the stator; a fan connected to the shaft for rotation with the shaft, the fan being connected to the shaft between the second end frame and the rotor, the fan being configured to pull air in a direction generally defined from the first end frame to the fan, at least a portion of the air flow generated by the fan exiting the housing through the plurality of air vents; a control box coupled to the housing adjacent the first lead wire aperture, the control box comprising a second lead wire aperture defined in the control box, the control box being configured to house a plurality of control components utilized in the control and operation of the electric motor, the plurality of control components comprising an electric start switch, the electric start switch being operable to remove the auxiliary circuit from the stator circuit after startup of the electric motor; and lead wires electrically connecting the stator circuit and at least some of the plurality of control components, the lead wires extending through the first and second lead wire apertures, the first and second lead wire apertures being at least partially positioned axially between the fan and the first end frame. 15. An electric motor according to claim 14 wherein the control box further comprises a contoured surface sized to substantially match an outer surface of the sheet metal body.16. An electric motor according to claim 14 wherein the control box further comprises a base portion and a cover, and wherein the cover is secure to the base portion using a single threaded fastener.17. An electric motor according to claim 14 wherein the stator further comprises a second stator circuit comprising a second main circuit and a second auxiliary circuit, wherein the second main circuit comprises a second main winding, and wherein the second auxiliary circuit comprises a second capacitor and a second auxiliary winding.18. An electric motor according to claim 14 wherein the lead wires do not extend axially beyond the fan in the direction of the second end frame.19. An electric motor according to claim 14 wherein the control box comprises a plurality of power cord inlet options.20. An electric motor comprising:a housing comprising a first end frame, a second end frame, a generally cylindrical body connecting the first end frame and the second end frame, a shaft aperture defined in the first end frame, a lead wire aperture defined in the generally cylindrical body, and a plurality of air vents defined in the generally cylindrical body; a stator fixed relative to the housing, the stator comprising a stator circuit comprising a main circuit and an auxiliary circuit, the main circuit comprising a main winding, and the auxiliary circuit comprising a start winding and a capacitor; a shaft rotatable relative to the housing and extending through the shaft aperture for connection to a fluid pump of a jetted tub application, the shaft being supported for rotation about a shaft axis by a first bearing supported by the first end frame and a second bearing supported by the second end frame; a rotor connected to the shaft for rotation with the shaft relative to the stator; a fan connected to the shaft for rotation with the shaft, the fan being connected to the shaft between the second end frame and the rotor, the fan being configured to pull air in a direction generally defined from the first end frame to the fan, at least a portion of the air flow generated by the fan exiting the housing through the plurality of air vents; a control box coupled to the housing adjacent the first lead wire aperture, the control box comprising a second lead wire aperture defined in the control box, the control box being configured to house a plurality of control components utilized in the control and operation of the electric motor, the plurality of control components comprising the capacitor and an electric start switch, the electric start switch being operable to remove the auxiliary circuit from the stator circuit after startup of the electric motor; and lead wires electrically connecting the stator circuit and the electric start switch, the lead wires extending through the first and second lead wire apertures, the first and second lead wire apertures being at least partially positioned axially between the fan and the first end frame, the lead wires not extending axially past the fan in the direction of the second end frame.