Rotor for an induction motor

• US 5,861,700 A
• Filed: 03/18/1997
• Issued: 01/19/1999
• Est. Priority Date: 04/30/1996
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Ki-Bong
• Primary Examiner(s): Dougherty, Thomas M.
• Assistant Examiner(s): MULLINS, BURTON S
• Application Number:
  US08/819,960
• Time in Patent Office: 672 Days
• Field of Search: 310/261, 310/264, 310/269, 310/166, 310/168, 310/262, 310/265, 310/61, 310/192, 310/216, 310/217
• US Class Current: 310/216.119
• CPC Class Codes: H02K 1/32 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 17/16 having rotors with internally short-circuited windings, e.g. cage rotors
• CPC Class Codes: H02K 9/227 Heat sinks

Abstract

A rotor for an induction motor includes a core having a central hole extending axially therethrough for receiving a shaft. A plurality of large spaces are formed in the core radially outside of the center hole. The spaces are filled with a non-ferrous metal, and blowholes extend through the non-ferrous metal for conducting cooling air through the core.

Claims

1. A rotor adapted for use in an induction motor, the rotor comprising a core having a central hole extending axially therethrough and adapted to receive a shaft;

a plurality of spaces formed in the core in circumferentially spaced relationship, each space filled with a non-ferrous metal;

at least one blowhole extending through the non-ferrous metal of each of the spaces, whereby each blowhole is able to conduct cooling air through the core;

each of the spaces including radially spaced outer and inner sides and a pair of circumferentially spaced sides;

each of the circumferentially spaced sides interconnecting the outer and inner sides;

the outer side having a longer circumferential dimension than the inner side;

each of the spaces having a maximum radial dimension extending between the outer and inner sides thereof;

the core defining a first distance extending radially from an outer edge of the central hole to an outer periphery of the core, and a second distance extending radially from the outer edge of the central hole to the outer side of each of the spaces;

the second distance being about one-half of the first distance;

the maximum radial dimension of each space being about one-half of the first distance.

2. The rotor according to claim 1 wherein each blowhole is spaced from the outer and inner sides and from the circumferentially spaced sides of the respective space.

3. The rotor according to claim 1 wherein each of the spaces is interrupted in the axial direction by an isolating plate;

the blowholes extending through respective ones of the isolating plates.

4. The rotor according to claim 1 further including end rings mounted on opposite ends of the core.