What Cooling Methods Are Available For The Motor? Summary Of Common Motor Cooling Methods (Part 2)

1. Common cooling methods

1. IC01 natural cooling (surface cooling)

Note: The surface temperature of this type of motor is high, which may affect the surrounding equipment and materials. Therefore, in some industrial applications, consideration should be given to avoiding the negative impact of motor temperature through motor installation and moderate derating.

2. IC411 self-fan cooling (self-cooling)

IC411 realizes cooling by moving the air through the rotation of the motor itself, and the moving speed of the air is related to the speed of the motor.

3. IC416 forced fan cooling (forced cooling or independent fan cooling)

IC416 contains an independently driven fan, which ensures a constant air volume regardless of the speed of the motor.

IC411 and IC416 are the cooling methods often used for low-voltage AC asynchronous motors, and the heat dissipation is achieved by blowing the cooling ribs on the surface of the motor by a fan.

1. The type of cooling fan of the motor

2. Backward centrifugal fan

3. Radial centrifugal fan

4. Axial flow (propeller type)

The design of the fan is based on the principle of obtaining the maximum cooling effect with the minimum loss, and the streamlined surface design is mostly used to maximize the ventilation efficiency of the fan and reduce the ventilation noise.

4. Water cooling

The heat generated by the large losses in the motor is dissipated into the surrounding air through the surface of the motor. When the motor is working under certain conditions, in order to prevent the high temperature rise of various parts of the motor, sometimes there are special channels or pipes filled with water in the hottest part of the motor, and the circulating air inside the motor will give the inner heat to the quilt. Water cooled surface.

5. Hydrogen cooling

Hydrogen cooling is used in high-speed electrical machines such as turbo-generators. In a closed system, the hydrogen gas several percent higher than the atmospheric pressure is circulated internally by the built-in fan, and flows through the heating part of the motor and the water-cooled tubular cooler in turn.

6. Oil cooling

In some motors, the stationary parts, and even the rotating parts, are cooled with oil, which circulates inside the motor and through coolers placed outside the motor.

2. Motor classification based on cooling method

(1) The natural cooling motor does not use special methods to cool the various parts of the motor, and only relies on the rotation of the rotor itself to drive the air.

(2) The heating part of the self-ventilated motor is cooled by a built-in fan or a special device attached to the rotating part of the motor.

(3) Externally ventilated motor (blow-cooled motor) The outer surface of the motor is cooled by the wind generated by the fan installed on the motor shaft, and the outside air cannot enter the heating part inside the motor.

(4) The circulation of the motor cooling medium with additional cooling equipment is generated by special devices outside the motor, such as water cooling cabinets, air cooling cabinets and centrifugal eddy current fans.