Protection level and cooling method are important components of motor product performance. The protection level is the specific requirements for the protection of the motor through the design and cooperation of the components themselves according to different protection requirements, mainly in the key parts of the motor frame, end cover, bearing system, and wiring system. For example, protection grades such as IP23, IP44, and IP54 are more common in small and medium-sized motors. "IP" is the international protection level code, and the two digits after "IP" represent the degree of dustproof and liquid proof respectively.
During the operation of the motor, a certain amount of heat is always generated. In order to ensure the normal operation of the motor, it is necessary to dissipate the heat generated by the motor through appropriate cooling measures to ensure that the motor windings and related components operate under safe environmental conditions. The cooling method is represented by the code "IC", and the numbers after "IC" represent the cooling medium, the cooling medium circuit, the primary cooling medium pushing method and the secondary cooling medium pushing method respectively. IC01, IC06, IC411, IC416, IC611, and IC616 are the common cooling methods for motor products. The cooling method should match or correspond to the protection level of the motor, and follow the principle of meeting the requirements.
Definition of common cooling methods:
IC01——The motor is cooled by free circulation with air as the medium, which means that the cooling medium is freely inhaled from the surrounding environment and then directly returned to the surrounding environment, which belongs to the open-circuit state of in and out; the movement of the cooling medium is related to the motor speed, or due to the action of the rotor itself, or the action of the integrated fan or pump pulled by the rotor, the movement of the medium is promoted. Most IP23 motors use this cooling method, and there are also cases where IC06 cooling is used.
IC06——It is an external independent component that drives the operation of the medium. The difference from IC01 is that the medium is driven by an independent component installed on the motor, which has nothing to do with the speed of the motor, such as the axial fan and centrifugal fan used in the variable frequency motor.
IC411——The surface cooling of the casing with air as the medium, that is, the primary cooling medium circulates in the inner cavity circuit of the motor, and the heat is dissipated through the casing. The cooling ribs on the motor frame and end cover are the effect; The primary and secondary cooling and driving modes of the cooling method are both self-circulating modes, that is, related to the speed of the motor, or due to the action of the rotor itself, or the action of the integral fan or pump hauled by the rotor to promote the movement of the medium. IP44, IP54, IP56, and other enclosed small and medium power frequency motors mostly use this cooling method.
IC611——With air as the medium, there is an external cooler, the primary medium circulates in a closed circuit, and the heat is taken away through the cooler; the primary and secondary cooling medium is driven in the same way as IC411.
IC616 ——Different from IC611, this cooler adopts an independent operation mode, which has nothing to do with the speed of the motor body and belongs to the forced ventilation structure.
Based on the above content, we can find that most variable frequency motors use forced ventilation structures, while power frequency motors mostly use self-circulating ventilation structures. IC611 and IC616 are commonly used cooling methods for high-voltage motors and low-voltage power box-type enclosed motors.