Unimotor Motor Housing

Heat Transfer from Radically Finned Motor Housings

One of the most important features of an electric motor is its rated torque value per unit of motor volume. To maximize this value, the motor surface must lose heat as efficiently as possible. Additionally, servo motors must provide full torque at zero speed. It is not practical to use a shaft mounted fan for cooling so the motor must keep cool through a combination of natural convection, conduction through the front flange, and radiation.

Figure 1

For a motor to give a performance that requires minimal de-rating, it must be designed so that it can be mounted in a number of orientations. The Unimotor’s finned design ensures that the motors can be mounted horizontally or vertically without significant effect on heat transfer. CT Dynamics’ engineers derived the optimal fin thickness and spacing using a specially designed computational fluid dynamics (CFD) model.


Figure 1. Naturally ventilated motors usually have a relatively smooth frame surface. The frame is cylindrical or square, or a combination of the two. The above illustrations show half cross sections of the various motor types as used in the CFD model 

Adding fins to a surface increases the convective cooling -radiators are an everyday example. Axial fins are common in forced ventilated motors. CT Dynamics has taken this concept a stage further to develop the Unimotor range of servo motors.


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Microcon Technologies Inc.

1105 Crestlawn Drive, Unit # D8 & D9

Mississauga, Ontario L4W 1A7 Canada

Tel: (905) 602-4770

Fax: (905) 602-4779

e-mail: sales@microcontechnologies.com

Website: www.microcontechnologies.com