Lead-wire leading device in electric motor

• US 5,847,477 A
• Filed: 06/25/1997
• Issued: 12/08/1998
• Est. Priority Date: 01/28/1997
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Morishita, Akira, Shiroyama, Shigeru
• Primary Examiner(s): Dougherty, Thomas M.
• Assistant Examiner(s): Lam, Thanh
• Application Number:
  US08/882,575
• Time in Patent Office: 531 Days
• Field of Search: 310/71, 310/249, 310/251
• US Class Current: 310/71
• CPC Class Codes: H02K 11/40 Structural association with grounding devices
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132

Abstract

A lead-wire leading device in an electric motor which comprises: lead wires 10a and 10b having first ends which are connected to a terminal, and second ends, namely, the remaining ends which are connected to brushes; and a grommet 7 adapted to secure the lead wires to a motor frame, namely, a rear bracket 12, the grommet 7 being fitted on the lead wires 10a and 10b, so that the leakage current circuit which is formed by the lead wires 10a and 10b, the grommet 7, and the rear bracket 17 when the motor operates abnormally is cut off with an insulating member, namely, a silicone glass tube 14 which is higher in heat resistance than the grommet 7.

Claims

1. A lead-wire leading device in an electric motor, comprising:

a lead wire having one end which is connected to a terminal, and the other end which is connected to an internal conductor in said electric motor;

a grommet adapted to secure said lead wire to a motor frame; and

an insulating member arranged between said lead wire and said motor frame, said insulating member being higher in heat resistance than said grommet.

2. A lead-wire leading device as claimed in claim 1, wherein said insulating member is a silicone glass tube arranged between said lead wire and said grommet.

3. A lead-wire leading device as claimed in claim 1, wherein said insulating member is an alamide paper arranged between said lead wire and said motor frame.

4. A lead-wire leading device as claimed in claim 1, wherein said insulating member is a piece of silicone glass adhesive tape wound on said lead wire.

5. A lead-wire leading device as claimed in claim 1, further comprising a second lead wire having one end which is connected to a terminal, and the other end which is connected to an internal conductor in said electric motor, said second lead wire is fixed with said lead wire to form a fixing portion;

and

wherein said insulating member surrounds the fixing portion.

6. A lead-wire leading device as claimed in claim 1, further comprising a leading terminal to which said lead wire is connected;

and

wherein said insulating member surrounds said leading terminal.