Cooling device of linear motor

• US 7,960,874 B2
• Filed: 12/21/2006
• Issued: 06/14/2011
• Est. Priority Date: 12/21/2006
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Ogushi, Tetsuro, Oda, Haruhiro, Nakagawa, Toshinori
• Primary Examiner(s): Leung; Quyen
• Assistant Examiner(s): GONZALEZ QUINONE, JOSE A
• Application Number:
  US12/517,503
• Publication Number:
  US 20100066179A1
• Time in Patent Office: 1,636 Days
• Field of Search: 310/12.11, 310/12.29, 310/12.31, 310/13, 310/14, 310/12.01, 310/12.25, 310/12.26
• US Class Current: 310/12.29
• CPC Class Codes: B60L 13/03 Electric propulsion by linear motors
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: H02K 1/20 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 1/32 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 41/02 Linear motors; Sectional motors
• CPC Class Codes: H02K 9/02 by ambient air flowing through the machine
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

A cooling device of a linear motor to cool a primary side of the linear motor including an iron core and a coil accommodated in slots of the iron core, including an elongate cover covering coil end portions exposed from both side faces of the iron core in a longitudinal direction, an air channel serving as blower for forcing a current of cooling air inside the cover, and a partition plate dividing the inside of the cover into upper and lower spaces. It is configured in such a manner that the upper space divided by the partition plate is used as a ventilation portion through which a current of cooling air is forced and the lower space is used as a cooling portion in which the coil end portions are accommodated and cooled. A slit is formed almost along a full length of the partition plate on a side closer to the iron core for bringing the ventilation portion and the cooling portion into communication with each other, and a vent is provided in a lower portion of the cooling portion.

Claims

1. A cooling device of a linear motor for a vehicle incorporated in a vehicle running on rail tracks at a lower portion so as to oppose a secondary side of a linear motor laid on the rail tracks and configured to cool a primary side of the linear motor having an iron core that is long in a running direction and a coil accommodated in a slot of the iron core, comprising:

an elongate cover that covers end portions of the coil exposed from both side faces of the iron core in a longitudinal direction;

blower means for forcing a current of cooling air inside the cover; and

a partition plate that divides an inside of the cover into an upper space and a lower space,

wherein;

the upper space divided by the partition plate is used as a ventilation portion through which the current of cooling air is forced and the lower space is used as a cooling portion in which the end portions of the coil are accommodated and cooled;

a slit is formed almost along a full length of the partition plate on a side closer to the iron core in a direction parallel to the longitudinal direction of the iron core for bringing the ventilation portion and the cooling portion into communication with each other; and

a vent is provided in a lower portion of the cooling portion by making an open space formed from the iron core.

2. The cooling device of a linear motor for a vehicle according to claim 1, wherein:

a plurality of introduction portions that force the current of cooling air from the blower means inside the cover are provided on a top face of the cover in a longitudinal direction.

3. The cooling device of a linear motor for a vehicle according to claim 1, wherein:

a plurality of ventilation holes communicating from the ventilation portion inside the cover to a top face of the iron core are provided so as to send part of the current of cooling air from the blower means onto the top face of the iron core.

4. The cooling device of a linear motor for a vehicle according to claim 2, wherein:

a plurality of ventilation holes communicating from the ventilation portion inside the cover to a top face of the iron core are provided so as to send a part of the current of cooling air from the blower means onto the top face of the iron core.