What Is The Effect Of The Current Density On The Motor?

Current density refers to the current passing through under the unit cross-sectional area of the motor winding, and the electric load refers to the number of amperometric conductors per phase winding of the motor, characterizing the total electrical load passing into a phase winding of the motor. Line load refers to the number of amperometric conductors in the unit length along the circumference of the armature. The line load is an important technical and economic parameter of the motor. The value size determines the size of the winding copper loss generated by the unit surface area of the circle in the stator, which directly affects the temperature rise and efficiency. Thermal load refers to the copper consumption on the unit surface of the armature, which is an important index to measure the heating situation of the motor. The calculation formula is as follows

The selection of current density has a great impact on the performance and cost of the motor, so the specific situation of the motor should be taken into account: efficiency, working condition, manufacturing cost, service life, heat dissipation condition, insulation level, wire material and so on. Choose a large current density, conductor section reduction, can save materials, reduce the cost, but at the same time lead to increased loss, efficiency reduction, at the same time, the temperature rise of the motor increased, life and reliability are reduced. Electric load considers the total number of amperometric conductors per phase winding of the motor. For the motors with the same armature diameter, the electric load and the line load have the same physical significance. The line load selects a larger value, in the case of the same output torque, the size and weight of the motor will be reduced, but at the same time, the copper consumption on the armature unit surface increases, the temperature rise of the winding increases, and the armature reaction increases, the mechanical characteristics become soft (the line load increases, the winding reactance will increase). The size of the heat load directly affects the heat and temperature rise of the motor. The greater the heat load value, the higher the heat and temperature rise of the motor.

In order to avoid the high temperature rise of the motor, the product of line load A and electric density J cannot exceed A certain limit. If A is large, J should be smaller accordingly. In fact, we always hope that the output torque of the motor is larger, which is bound to increase the motor line load, and the increase of the line load will certainly lead to the increase of the current density, and then the heat load of the motor increases. In this way, we can only solve from the heat dissipation aspect, improve the heat dissipation capacity of the motor, as far as possible to reduce the temperature rise of the motor.

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