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Electric Car Knowledge

Electric vehicle electrical knowledge

Permanent magnet motor stator is by the barrel and of permanent magnet. Stator shape for the bucket, is a motor shell, also is the motor of the magnetic circuit channel. It requires good mechanical strength, and has the characteristics of magnetic resistance small, material generally choose for 20 # steel, depending on the thickness of permanent magnet with different and in 3 MM to 5 MM or so. The shape of the permanent magnet for tile form, basically to make permanent magnets, shell and considerate and no gap, "the cylinder body should be the radian diameter. Paste requirement firm, many by high performance structure green red AB glue.
 

Permanent magnet motor is the most important part of the performance, it is directly determines the motor performance. Permanent magnets, points and the N very, very S also is the north and south poles, when using, for S and a supporting the use of the N. The material of permanent magnet is commonly ferrite and ndfeb, processing method for sintering type. Hard ferrite is a kind of nonmetal permanent magnet, it has high coercive force, high resistivity, density is small and the price is low wait for an advantage,Its defect for residual magnetism induction strength is low, the temperature coefficient of the residual magnetism is bigger. Nd-fe-b permanent magnets, is developing rapidly in recent years the third generation of rare earth permanent magnet material, it has high coercive force, high energy product for 8 to 10 times of ferrite), the advantages of high mechanical strength, its disadvantages for easy to rust, not easy processing, prices higher.

Permanent magnet motor armature current through the rotor after carbon brushes, commutator reversing, the permanent magnetic magnets under the action of rotating magnetic field. This will save the excitation coil of electricity, the consumption at work so as to increase the motor to use the conversion efficiency, the limited energy of electric vehicles speaking, is very important. Can reduce the driving current, extend XuHang mileage, and low cost, so now most of the small and medium-sized power electric cars are the permanent magnet motor. Permanent magnet motor and excitation motor armature of rotor, front and rear, carbon brushes assembly on the structure similar, just the stator is difference between the size difference, permanent magnet motor and excitation motor of the major parts.

Excitation type motor stator mainly by the poles and the field winding (core) of the poles. Stator shape for the bucket, is a motor shell, also is the motor of the magnetic circuit channel. Require it to better mechanical strength, general materials for 45 # steel, in 10 MM thickness to the left. The Lord is general by electromagnetic pure iron plate poles combination and become, outside its radian should be from inner diameter of the stator, shape for tile form, basically to make the poles and stator joint no gap and strong, use more use screws tighten. For high strength enameled wire excitation coil around from the system, the set is on the main magnetic poles.When electricity poles Lord will be produced after magnetic field, the strength of the magnetic field and exciter current is proportional to the size, the magnetic field with positive and negative polarities exciter current direction transform and change. Excitation type of rotor motor armature by carbon brushes, commutator through the current in excitation coil, the magnetic field generated electricity interaction spin. Because the Lord of the magnetic field strength poles can vary, so has started smoothly and quickly, traction. Acceleration Produce a magnetic field of exciter current that use the power, but part of the high power electric cars used battery is also the large capacity, exciter current just a small part of, so this kind of motor is still be large electric car used.

Excitation coil armature winding and how to determine the connection, and the excitation type: excitation it coils and rotor winding of excitation type series called string of dc motor excitation, if coil not and the armature winding connection, and separately from other dc power supply called him the shunt type dc motor. String of excitation type dc motor has a very superior traction characteristics: can withstand the three times the overload current (time), and produce 1 minute 4.5 times more overload torque. Through the controller battery voltage of the modulation, can meet the overloaded vehicles, climbing and flat way starting high-speed operation, many choose in a negative weight, starting frequent cars.

He excitation type dc traction motor through the controller to the field winding and the armature winding of the power supply system respectively, besides can get a string of excitation type dc traction motor superior traction characteristics, through the controller procedure establishment can have the speed limit of the uphill, down the downhill run downhill, and slows down using the regenerative braking motors electrical energy, change the motor to recovery in electronic non-contact change have instead of large current contactor change the field winding polarity, improve the system reliability. Therefore the state "the highway with tourism car general technical conditions" clear requirements "golf car motor adopted his efforts in the dc traction motor type".

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