The components of electric vehicles include: electric power drive and control system, driving force transmission and other mechanical systems, the completion of the task of the work device, etc. Electric power drive and control system is the core of electric vehicle, which is also the biggest difference from the internal combustion engine. The power drive and control system are composed of drive motor, power supply and motor speed control device. Other electric vehicles are basically the same as internal combustion engines.
Fold the power
The power supply is the electric power of the electric motor, which converts the electrical energy of the power to mechanical energy, through the transmission device or directly driving the wheels and working device. Now, the most widely used in electric vehicle power supply is a lead-acid battery, but with the development of electric vehicle technology, lead-acid battery due to the low specific energy, charging speed slower, life is short, gradually replaced by other batteries. Is the power of the development are mainly sodium sulfur batteries, nickel-cadmium batteries, lithium batteries, fuel cells, the flywheel battery, etc., these new type of power supply applications, opened up broad prospects for development of electric vehicles.
Folding drive motor.
The function of the driving motor is to convert the electrical energy of the power supply into mechanical energy, through the transmission device or directly drive the wheel and the working device. Currently, dc series motor is widely used in electric vehicles, which has the mechanical characteristics of "soft", which is very consistent with the driving characteristics of cars. Due to commutation spark, but dc motor than smaller power, low efficiency, maintenance workload is big, with the development of motor technology and control technology, will gradually be brushless dc motor (BLDCM), switch reluctance motor (SRM), and was replaced by ac asynchronous motor, if there is no direct current series motor shell disc axial magnetic field
Speed control device for folding motor.
Motor speed control device for the speed and direction of the electric vehicle conversion Settings, such as its function is to control the voltage or current of the motor, complete control of the driving torque of the motor and the direction of rotation.
In the early electric vehicles, the direct current motor speed is realized by using the series resistance or changing the turns of the magnetic field coil of the motor. Because of its level of speed regulation, it will generate additional energy consumption or use the motor structure, which is seldom used now. At present, it is widely used in electric vehicles, which is the speed adjustment of the thyristor chopper. By changing the terminal voltage of the motor uniformly, the current of the motor is controlled to realize the stepless speed regulation of the motor. In the development of electronic power technology, it is gradually replaced by other power transistors (including GTO, MOSFET, BTR and IGBT). From the development of technology, with the application of new driving motor, the transformation of electric vehicle speed control into the application of dc inverter technology will become an inevitable trend.
In the drive motor rotate to transform control, dc motor depend on contactor change the armature or the current of the magnetic field direction, realize the motor rotate to transform, which makes the circuit complexity, lower reliability. When the ac induction motor is driven, the change of the electric motor is only required to change the phase sequence of the three-phase current of the magnetic field, which can simplify the control circuit. In addition, using ac motor and frequency conversion speed control technology, it is more convenient to control the braking energy of electric vehicle, and the control circuit is simpler.
The power of electric vehicle drive is to transfer the drive torque of the motor to the driving shaft of the car. When the electric wheel drive is adopted, most parts of the transmission device can often be ignored. Because the motor can be started with a load, the electric car does not need a traditional internal combustion engine car clutch. Because the rotation of the drive motor can be transformed through the circuit control, the electric vehicle does not need the reverse gear in the internal combustion engine gearbox. When the motor stepless speed regulation is adopted, the electric vehicle can ignore the transmission of the conventional car. Electric vehicles can also omit the differential of the traditional internal combustion engine drive system.
Folding driving device
The driving force of the driving device is to turn the driving torque of the motor through the wheel to the force on the ground, driving the wheel to walk. It is the same as other cars, made up of wheels, tires and suspension.
The steering gear is set up to realize the turning of the car, which consists of steering machine, steering wheel, steering mechanism and steering wheel. The steering control of the steering wheel can be achieved by steering the steering wheel and steering mechanism. Most electric cars are turned to the front wheel, and the electric forklifts used in industry often use rear wheels. The steering gear of electric vehicle has mechanical steering, hydraulic steering and hydraulic power steering.
The braking device of an electric vehicle, like any other car, is set up for a car to slow down or stop, usually consisting of a brake and its control device. On electric cars, general and electromagnetic brake device, it can be used to drive motor control circuit of the power running of the motor, the deceleration braking when the pair of energy conversion, the battery charging current, and recycling is obtained. At present, the domestic electric vehicle in the high power passenger vehicle, provides the air brake equipment has the endurance NAILI slide air compressor, mainly is the compressed air braking mode.
Folding work device
The working device is specially designed for the industrial electric vehicle to complete the operation requirements, such as lifting device, door frame and cargo fork of electric forklift. The lifting of the fork lift and the tilt of the frame are usually completed by the hydraulic system driven by the motor.
Introduction of folding charging stations.
Similar to the ladder wave six sections of charging, charging the mobile phone of ICM has good cure effect, can the battery first activated, then maintenance type quick charge, timing alarm, computer, and quick filling, password control, since the recognition function such as voltage, multiple protection, four-way output, supporting universal output interface, but for all of the electric vehicle fast charging. Public places such as shopping malls, supermarkets, hospitals, parking lots, doorways, roadside kiosks, etc.
In the process of charging infrastructure, the problem that needs to be solved urgently is the problem of charging service network. Power sector based on the existing parking facilities, adjust measures to local conditions to build micro power grid, a distributed and integrated rechargeable, charging station can be in full function, can avoid the charging mode of two short board: one is the charging time is long, the second is parking environment co., LTD.