Motor alone (there is no gear head or heat sink) ・ Load condition: No external forced cooling (no air flow or cooling by an external fan). No load for single phase motor, rated load for three phase motor ・ Ambient temperature: 50° C (The upper limit of motor specification. We have specified the temperature rise and time rating of the AC motor under the severest conditions for the motor. Motor winding temperature change due to the passage of operating time We will introduce the temperature rise of the motor winding when actually driving the motor. Our AC motors will not burn out if the motor case temperature is below 90° C. The guidelines for each heat resistant class are summarized in the table below. During operation, be careful not to exceed the winding allowable temperature.Īs the winding temperature inside the motor can not be measured directly, measure the surface temperature of the motor case as a reference.įor our AC motor, the temperature difference between the windings and the motor case is up to 30 ° C. Also, if not burned, the temperature rise affects the motor life. If the internal temperature of the motor exceeds the heat class value for a while, the winding film melts and shorts. Classification varies from series to series. Our AC motors are classified as either Class E (120° C) or Class B (130° C). The heat resistant class is a classification based on the heat resistant grade of the insulating material. Motor temperature rise affects the operating time limit and motor life. Electrical energy is not 100% converted to power, and some energy is lost (heat). Temperature Rise and Heat Resistant Class of AC Motor Electrical Energy Conversion and LossĪn AC motor is an energy conversion device that converts input electrical energy into power for rotation and outputs it.
We offer redesign or rebuild of your equipment to exact specifications and have the equipment, and capabilities to service any motor, either in our facility or on-site with our field technicians.Download PDF Temperature Rise and Life of an AC Motor 1. Our team of skilled, experienced and industry-trained technicians also offer services to support water pumps, water filtrations systems, standby generators, and welding machines. We specialize in new and used motor sales, motor rewinds, major motor repairs and overhauls ranging from fractional HP to 1500HP+, utilizing both low and medium voltage.
With over 33,500 square feet of office and shop space, our fully dedicated rewind facilities and technicians have the expertise and capabilities to keep your business operational. We provide our valued customers with sales, service and support from our two strategic locations situated in Cranbrook and Castlegar BC. has been operating in the Kootenays as its locally based electric motor repair experts for 25 years.
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