What's the difference between low voltage motor and high pressure, the advantages and disadvantages?

Motor is now live, is commonly used in the production of electric transmission equipment, is widely used, the chemical water pump common form a complete set of equipment is motor, motor type many, daily use, can be divided into low voltage motor and high pressure, so what is the low voltage motor, what is the high voltage motor, advantages and disadvantages? For ac motor, rated voltage 1000 v and above for high voltage motor; Less than 1000 v for low voltage motor ( Some in the data line is 1140 v) 。 For dc motor, rated voltage 1500 v and above for high voltage motor; Less than 1500 v low voltage motor. So, what are the advantages and disadvantages compared high voltage motor and low pressure: rated voltage, starting and working current is different, the higher the voltage, the smaller the current; The insulation of the motor and the pressure is different also, motor winding wires, too, the same power of motor, high voltage electrical wire is less than the low voltage, using the cable is different also. A, 1, winding faults of cost is relatively high, Is mainly caused by insulation) Cost will be higher, the insulation of the related materials. 2, insulation treatment is more difficult, man-hour costs more. 3, the use of the environment is strictly a lot than low voltage motor. Second, the advantages of 1, high voltage motor can do power is very big, can reach thousands or even tens of thousands of kilowatts. This is because, in the same output power, high voltage motor current is much smaller than low voltage motor ( Basically is inversely proportional to the voltage relationship) , such as 500 kw, 4 pole motor rated current, rated voltage 380 v to 900 a, and is rated voltage 10 kv only 30 years or so. So high voltage motor winding available smaller wire diameter. As a result, high voltage motor stator copper loss will be smaller than the low voltage motors. For more high power motor, the use of low voltage electrical, is due to the need of thicker wire requires a large area of stator slot, the stator core diameter is doing is very big, the motor the volume will be large. 2, for the large capacity motor, high voltage motor power supply and distribution equipment used in overall investment less than low voltage motor, and line loss is small, can save power consumption. 10 kv high voltage motor, in particular, can be directly use network power supply ( Our country provide users with high voltage is usually 10 kv) So in power equipment ( The main transformer) The investment will be less, use more convenient also, will also be less failure rate. Three, structure the main difference between 1, coil insulation, low pressure motor, mainly adopts enameled wire coil or other simple insulation, such as composite paper, high voltage of the motor insulation is usually adopts multi-layer structure, such as powder, mica tape, more complex structure, higher degree of pressure. 2, the difference on the heat dissipation structure, low pressure motor mainly adopts coaxial fan blowing straight heat dissipation, high voltage motor most with independent radiator, usually there are two types of fans, a set of the circulation fan, a set of external circulation fan, two groups of fan running at the same time, on the radiator will heat transfer heat from the outside of the motor. 3, bearing structure, low pressure motor usually before and after each have a set of bearings, and high voltage motor, because of heavy load, usually there will be two sets of bearing shaft extension end, non shaft extension end bearing number according to load conditions, specially large electric opportunities using sliding bearing.
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