How to choose the motor cooling method according to the actual working conditions?
The motor cooling method is a very entangled problem in the ordering of high-voltage motors, involving various factors such as cost, installation space and ventilation and heat dissipation effects. Today, Xiaobian talks with everyone about the cooling methods commonly used in motors.
Overview of common cooling methods
Rotating motor cooling methods include the nature of the cooling medium, various cooling circuit arrangements and the way the cooling medium is pushed. The cooling methods commonly used in motors are IC01, IC11, IC21, IC31, IC37, IC81W, IC611, IC616, etc.
●Typical cooling method
IC01: Self-cooling type, the fan is mounted on the shaft.
IC11: Self-ventilating with inlet ducts.
IC21: Self-ventilating with air duct.
IC31: Self-ventilation with inlet and outlet ducts.
IC37: Inlet and outlet ducts and independent or separate blower or coolant pressure source
IC611: Fully enclosed fan is cold and self-ventilating, and the motor is equipped with a heat exchanger (air to air)
IC616: Fully enclosed internal air self-circulation with independent blower heat exchanger (air to air) on the motor
IC666: Motor with a fully enclosed cooling air circulating in a motor with a separate air/air cooler.
IC81W: Fully enclosed air-cooled self-ventilation, equipped with a heat exchanger (air to water) on the motor, and the water circulation is powered by an independent water pump or water system.
The IC86W motor has a fully enclosed motor with a separate air/water cooler.
● Cooling medium code meaning
The cooling medium code is “flag letter” + “cooling circuit arrangement code” + “primary cooling medium code” + “primary cooling medium motion pushing method” + “secondary cooling medium code” + “secondary cooling medium motion driving method” .
For example, IC86W is fully labeled IC8A6W7. The specific meanings are: “IC” is the logo letter (international general cooling symbol), “8” is used to represent the external cooler (using remote medium), and “A” is used to characterize the primary cooling medium air. (Can be omitted), "6" indicates that the primary cooling medium is driven by a separate component, "W" characterizes the secondary cooling medium water, and "7" characterizes that the secondary cooling medium is driven by a separate component or cooling medium system (cooling medium) For water and the pushing method is 7, the number 7 can be omitted).
How to use the cooling method for the inverter motor
According to the specific load characteristics, the variable frequency speed regulating motor usually adopts several cooling methods such as IC411, IC416, IC611, IC616, IC666, IC86W, etc. The sensible and reasonable solution is: according to the specific situation, the cooling method is reasonably selected, which not only has low purchase cost, Operating costs will also be significantly reduced.
●Constant torque load
The load characteristics are constant torque below the base speed and constant power above the base speed. That is, during low-frequency start-up and low-frequency operation, the variable frequency speed control motor still outputs a large torque (rated torque). At this time, if the fan is cooled (such as IC411 and IC611), the speed is low and the cooling condition is used. Deterioration, motor heating is very serious, it is necessary to add an independent forced cooling fan to the motor to ensure safe operation of all frequency bands.
●Fan, pump load
When the load of the variable frequency speed regulating motor is the load of the fan and the pump, the load torque varies with the square of the rotational speed (TL∝n2), the load torque is small at low speed operation, the output power of the motor shaft is very low, and the heat generation is also small. There is no need to worry about the heat dissipation problem of the variable speed motor at low speed. You can use the internal and external fan cooling methods IC411 and IC611, which is the theoretical basis for J to introduce the IC611 motor to customers.
in conclusion
When selecting the variable frequency speed regulating motor, it is necessary to reasonably select the cooling method of the variable frequency speed regulating motor according to the difference between the driven load characteristics and the use environment. Only in this way can the safe and economic operation of the variable frequency speed control motor be guaranteed.
