Electrical knowledge of electric cars

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        Permanent magnet motor stator is a cylinder with permanent magnet. Stator shape of a drum-shaped, both the motor and housing, the motor magnetic circuit channels. It requires good mechanical strength, but also reluctance characteristics, the material is generally selected as the 20 # steel, thickness, as with different permanent magnet about 3mm to 5MM. Basically the shape of the permanent magnet tile, to make the permanent magnet cylinder considerate together there is no gap, the outside curvature of the tube inner diameter. Paste the requirements of the firm, the use of high-performance structural green and red AB glue.
        Permanent magnet motor of the most important parts, and its performance directly determines the performance of the motor. Permanent magnet sub S pole and N pole, which is the Antarctic and the Arctic, when used for the S and N pole supporting the use of Permanent magnet materials for ferrite and NdFeB processing for sintering. Ferrite permanent magnet is a non-metallic permanent magnets, i t has a high coercivity, high resistivity, low density and low-cost advantages, the drawback is the low remanence flux density, remanence temperature coefficient. NdFeB is the third generation of rare earth permanent magnet materials developed in recent years, it has a high coercivity, high energy product (8-10 times that of ferrite), high mechanical strength advantages, the drawback for easy rust, easy processing, to a slightly higher price.
        Armature rotor of the permanent magnet motor by current carbon brushes, commutator change in the magnetic field of the permanent magnet rotating. This eliminates the need for the electricity consumed in the work of the excitation coil, resulting in improved electrical conversion efficiency, the use of vehicles-3/">electric vehicles in terms of vehicle finite energy is very importa nt. The driving current can be reduced to extend the continued line mileage, and low cost, so now most of the small and medium-sized power electric cars are a permanent magnet motor. Permanent magnet motor and the exciter armature of the motor rotor, front and rear end caps, carbon brush assembly structure almost, but the size difference, the stator is the difference between the permanent magnet motor and the main part of the excitation of the motor.
        Excitation motor stator pole core and field winding (main pole). Stator shape of a drum-shaped, both the motor and housing, the motor magnetic circuit channels. Require it to better mechanical strength, general material is 45 # steel, the thickness of about 10MM. The main pole is generally a combination of electromagnetic pure iron, the outer curvature of the stator inner diameter, shape, basically the tile, to make the main pole and the stator fit without gaps and a solid, multi-u se screw fastening. The excitation coil is made of high strength enameled wire, set in the main magnetic pole. Produces a magnetic field when energized after the main magnetic pole will be proportional to the size of the magnetic field strength of the excitation current, the polarity of the magnetic field transform with the excitation current of positive and negative directions. Excitation of the motor armature rotor of carbon brushes, commutator rotating electricity passed through the interaction of the magnetic field generated by the exciter coil is energized. Due to the main magnetic pole magnetic field strength can be varied and therefore have a smooth start, acceleration, traction. Excitation current produces a magnetic field, although the use of a portion of electricity, but high-power electric cars with only a small part of the battery is also a large capacity, the excitation current, such motors are still being large-scale electric vehicle used.
  &nbs p;     Excitation coil and the armature winding connection, excitation: excitation coil and the rotor windings in series known as the series excited DC motor, the excitation coil and armature windings connected separately from other DC power supply called excited DC motor. Series excited DC motor has a very superior traction characteristics: can withstand three times the overload current (1 minute), and produce more than 4.5 times overload torque. By the controller on the battery voltage modulation, which can meet the overloading of the vehicle starter, high-speed operation of the climbing and Ping Road, more choice in the heavy load, starting on a frequent vehicle.
        Excited DC traction motor controller on the field winding and armature winding of the power supply system modulation, superior traction characteristics in addition to the available series excited DC traction motor controller program settings can has uphill Anti downturn, the next the slope of the speed limit to run downhill and deceleration, motor regenerative braking recovery of electricity, change the direction to use the electronic contact change has always been to change the polarity of the field winding, instead of high-current contact, to improve the overall system reliability. For this State. \"Non-road tourist vehicles GM technology\" clear requirements \"golf car motor with separately excited DC traction motor.