Browse Prior Art Database

Method for adding cooling fins to a motor

IP.com Disclosure Number: IPCOM000243944D
Publication Date: 2015-Oct-29
Document File: 3 page(s) / 208K

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention provides a cost effective way to increase an motor s ability to shed heat Adding fins to an otherwise smooth surface such as a smoothly round motor is a well known method of increasing the surface s ability to transfer heat to its surroundings thus cooling the surface itself In the case of motors the outer surface of the motor is typically smooth and cylindrical Theory and testing have shown that adding fins to the motor s OD significantly increases the heat flow out of the motor which in turn results in lower motor operating temperatures However adding those fins to the motor has been prohibitively expensive and or involves undesirable manufacturing drawbacks

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 52% of the total text.

Method for adding cooling fins to a motor

Purpose of invention:

   This invention provides a cost-effective way to increase an motor’s ability to shed heat.  Adding fins to an otherwise smooth surface (such as a smoothly round motor) is a well-known method of increasing the surface’s ability to transfer heat to its surroundings, thus cooling the surface itself.  In the case of motors, the outer surface of the motor is typically smooth and cylindrical.  Theory and testing have shown that adding fins to the motor’s OD significantly increases the heat flow out of the motor, which in turn results in lower motor operating temperatures.  However, adding those fins to the motor has been prohibitively expensive and/or involves undesirable manufacturing drawbacks.

   For the fins to effectively transfer heat, they must be in intimate contact with the motor’s housing.  Ideally, they should be formed of the housing itself, for example, machined from the housing.  Milling slots into the housing is one way to create effective cooling fins.  However, as mentioned, that method is very expensive and has manufacturing drawbacks.  An alternate method of creating fins is to weld bent sheet metal to the round motor housing.  But if extensive bead-welding is used, the cost is still high, and manufacturing problems (such as warpage of the stator) are also created.  Spot welding the fins to the housing could eliminate the warpage problems, but then the fins are not in intimate contact with the housing and their ability to transfer head is significantly impaired.  Even small gaps between the fins and housing seriously disrupt the flow of heat from the motor into the fins.  So it is necessary to ensure good contact between the fins and housing.

   This invention provides a way to ensure good contact of the fins to the housing (for good heat transfer) while permitting the use of cheap and easy spot welding...