How to reduce copper loss in MILL DC Motor?

1. Optimize winding design
Choose appropriate wire material
Choose high-purity, low-resistivity copper as winding wire. High-purity copper has fewer impurities and better conductivity, which can effectively reduce resistance. For example, oxygen-free copper has higher conductivity than ordinary copper. Using oxygen-free copper to make windings can reduce resistance loss when current passes through.
You can also consider using superconducting materials (resistance approaches zero at extremely low temperatures), but the current application of superconducting technology in conventional MILL DC Motors is limited by factors such as cost and refrigeration conditions.
Reasonable design of winding turns and wire diameter
According to the rated power, voltage, current and other parameters of the motor, accurately calculate the number of turns and wire diameter of the winding. The appropriate number of turns can ensure that the motor generates sufficient magnetic field strength and induced electromotive force. On the premise of meeting the performance requirements of the motor, appropriately increasing the wire diameter can reduce the wire resistance. For example, through electromagnetic design software, simulation calculations are performed to determine the number of turns and wire diameter combination that minimizes the winding resistance under specific power and voltage.
2. Improve the heat dissipation conditions of the motor
Optimize the ventilation system
Design a reasonable ventilation duct to ensure good air circulation inside the motor. The shape, size and position of the ventilation duct should be determined according to the structure and heat generation of the motor. For example, a ventilation slot is set between the stator and rotor of the motor so that the cooling air can directly take away the heat generated by the winding.
Add ventilation equipment, such as installing an efficient cooling fan. The air volume and wind speed of the fan should match the heat dissipation requirements of the motor. By increasing the air flow rate, the heat dissipation effect can be enhanced, the winding temperature can be reduced, and the copper loss caused by the increase in resistance due to the temperature increase can be reduced.
Use liquid cooling (if conditions permit)
For some high-power and high-heat MILL DC Motors, liquid cooling can be considered. For example, using a water cooling system, by setting cooling pipes around the stator or rotor of the motor, the coolant (such as water or special cooling oil) circulates to take away the heat. This method has higher cooling efficiency than air cooling, and can more effectively control the winding temperature and reduce copper loss.
3. Control the running current of the motor
Reasonably match the motor and the load
Select a motor of appropriate capacity according to the load requirements in the actual production of steel rolling. If the motor capacity is too large, the excitation current of the motor will account for a large proportion when running under light load, and the reactive power will increase. At the same time, the armature current may be in a non-optimal state due to mismatch, resulting in increased copper loss. Ensure that the motor runs close to the rated load, so that the armature current can be within a reasonable range and reduce copper loss.
For example, in the design stage of a rolling mill, it is necessary to accurately evaluate the load factors such as the maximum rolling force and rolling speed during the rolling process, and select the motor capacity that matches it.
Optimize motor control strategy
Adopt advanced motor control technologies such as variable frequency speed regulation and vector control. Taking vector control as an example, it can accurately control the armature current and excitation current of the motor, so that the motor can maintain high efficiency under different loads and speeds. By real-time monitoring of the motor's operating status, adjusting the current input, avoiding excessive or too small current, and thus reducing copper loss.
During the rolling process, when the hardness, thickness and other factors of the steel cause the load to change, these control technologies are used to adjust the motor's operating parameters in a timely manner to ensure that the motor always runs in an efficient manner and reduce unnecessary copper loss.