Electric motor construction

• US 4,297,627 A
• Filed: 11/07/1978
• Issued: 10/27/1981
• Est. Priority Date: 04/17/1978
• Status: Expired due to Term

• Current Assignee: Franklin Electric Company Incorporated (EBW, Inc.)
• Original Assignee: Franklin Electric Company Incorporated (EBW, Inc.)
• Inventors: Schaefer, Edward J.
• Primary Examiner(s): Witkowski, S. J.
• Assistant Examiner(s): Conklin, John B.
• Application Number:
  US05/958,534
• Time in Patent Office: 1,085 Days
• Field of Search: 318/778, 318/781, 318/784, 318/785, 318/786-794, 310/71, 310/72
• US Class Current: 318/778
• CPC Class Codes: H02K 17/30 Structural association of asynchronous induction motors with auxiliary electric devices influencing the characteristics of the motor or controlling the motor, e.g. with impedances or switches
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132

Abstract

This disclosure deals with single phase AC electric motors. The motor includes run and start windings, a start winding cutout switch connected in series with the start winding, and an electrical connector. Different power supply arrangements are provided which couple with the connector. One arrangement includes a power supply cable which supplies power and a jumper attachment which connects the start and run windings in parallel, thus causing the motor to operate as a split phase motor. In another arrangement, a cable supplies power and a capacitor attachment is provided for connecting the start winding to a start capacitor, thus causing the motor to operate as a capacitor start motor. The motor may be constructed to receive the attachments at either end of the motor.

Claims

1. In combination, an electric motor operable as a split phase or as a capacitor start motor, comprising an outer casing, a run winding circuit, a start winding circuit including a start winding cutout switch, said run and start winding circuits being mounted within said casing, power circuit means adapted to connect said start and run winding circuits to a power supply, said start winding and power circuits having an electrical gap formed therebetween, and removable interchangeable attachment means exterior of said casing and connectable to bridge said gap, one of said attachment means causing said motor to operate as a capacitor start motor and another if said attachment means causing said motor to operate as a split phase motor.

2. The combination of claim 1, wherein said attachment means comprises a jumper for connecting said start winding and power circuits for operation of the motor as a split phase motor.

3. The combination of claim 1, wherein said attachment means comprises a capacitor for connecting said start winding and power circuits for operation as a capacitor start motor.

4. The combination of claim 1, wherein said motor further includes an outer casing, a first connector half accessible exteriorly of said casing and including spaced electrical connectors forming said gap, said first conductors half receiving said attachment means.

5. The combination of claim 4, wherein said first connector half includes at least two prongs, and said attachment means being fastened to said casing and including a jumper connected between said prongs.

6. The combination of claim 5, wherein said attachment comprises a plug having said jumper therein.

7. The combination of claim 5, wherein said attachment comprises said capacitor, means for securing said capacitor to said casing, and a second connector half fastened to said capacitor and matable with said first connector half.

8. The combination of claim 4, wherein said attachment means includes a second connector half adapted to mate with said first connector half.

9. The combination of claim 8, and further including a power supply cable for connecting said motor to a power supply, and said second connector half forms a termination of said cable.

10. The combination of claim 1, and further including a housing containing said circuits, power supply connector means adjacent one end of said housing, and means adjacent another end of said housing for securing said attachment.

25. The combination of claim 4, wherein said start winding cutout switch is accessible externally of said outer casing.

26. The combination of claim 10, wherein said start winding switch is accessible externally of said housing.

11. The combination of an electric motor including an outer casing, a run winding circuit and a start winding circuit in said casing, power circuit means adapted to connect said start and run winding circuits to a power supply, a start winding cutout switch connected in said start winding circuit, said start winding and power circuits having an electrical gap formed therebetween and said gap being accessible externally of said casing, connector means fastened to said housing and including at least two spaced conductors, said gap being formed by said spaced conductors, and removable attachment means external of said casing and connected to said spaced conductors for bridging said gap.

12. The combination of claim 11, wherein said attachment means comprises split phase means including a jumper, and capacitor start means including a capacitor, said split phase means and said capacitor start means being interchangeable.

13. The combination of claim 11, wherein said motor further includes a power cable connector, said connector means and said cable connector being separated.

14. The combination of claim 11, wherein said motor further includes a power cable and a power cable connector, and said connector means and said attachment means form part of said power cable and said power cable connector.

27. The combination of claim 11, wherein said start winding cutout switch is accessible externally of said casing.

15. The combination comprising:

(a) an electric motor including a run winding, a start winding, a cutout switch connected to the start winding, an electric connector, and a common wire which is connected to the start winding and to the cutout switch;

(b) a motor part of said electric connector including three contacts, one contact being connected to said run winding, one contact being connected to said start winding, and said common wire being connected to the third contact;

(c) a power supply cable including a cable part of said electric connector, said cable part including three contacts which connect with said three contacts of said motor part of said connector; and

(d) and means in said cable electrically connecting said contact for said start winding with one other of said contacts.

16. The combination specified in claim 15, wherein said means comprises a jumper connection between two contacts of said cable part.

17. The combination specified in claim 16, wherein said jumper connection is in said cable part of said connector.

18. The combination specified in claim 15, wherein said means comprises a capacitor electrically connected between two contacts of said cable part.

19. The combination specified in claim 18, wherein said cable includes three wires and said capacitor is connected between two of the wires.

20. The combination specified in claim 19, and further including a two wire cable connected to said three wire cable.

21. The combination comprising:

(a) an electric motor including a run winding, a start winding, a cutout switch connected to the start winding, an electric connector and a common wire which is connected to the start winding and to the cutout switch;

(b) a motor part of said electric connector including three contacts, one contact being connected to said start winding, and said common wire being connected to the third contact;

(c) a power supply cable including a cable part of said electric connector, said cable part including three contacts which connect with said three contacts of said motor part of said connector; and

(d) said cable part of said electric connector further including a bridge conductor which connects the contacts which are electrically connected to said start winding and to said run winding.

22. The combination comprising:

(a) an electric motor including a run winding, a start winding, a cutout switch connected to the start winding, an electric connector and a common wire which is connected to the start winding and to the cutout switch;

(b) a motor part of said electric connector including three contacts, one contact being connected to said run winding, one contact being connected to said start winding, and said common wire being connected to said run winding and to said cutout switch;

(c) a first power supply cable design including a cable part of an electric connector, said cable part including three contacts which mate with said three contacts of said motor part of said connector, a bridge conductor connected to two of said three contacts and connecting said start and run windings in parallel, and two wires for connecting said bridge conductor and the third contact to an AC power supply;

(d) a second power supply cable design including a cable part of an electric connector, said cable part including three contacts which mate with said three contacts of said motor part of said connector, three wires connected to said three contacts, and a capacitor connected between two of the three wires,

(e) said connector cable parts of said first and second power supply cable designs having the same size and being interchangeable so that said motor is useable with either of said designs.

23. An electric motor comprising a run winding circuit, a start winding circuit, power circuit means adapted to connect said start and run winding circuits to a power supply, said start winding and power circuit having an electrical gap formed therebetween, a pair of spaced conductors accessible externally of said motor and forming said gap, and electrical jumper means removably attached to said motor and engageable with said spaced conductors for making said motor operable as a split phase motor.

24. A motor according to claim 23, and further including a capacitor attachment means adapted to be connected to said conductors.