Asynchronous traction electric drive for a сheap city passenger vehicle

Abstract

The basic principles for the design and production of a cheap city electric car have been formulated. The technical parameters of the transmission of a cheap city electric car with an internal combustion engine have been analyzed, on the basis of which a cheap city electric car should be manufactured. The requirements for the technical parameters of a cheap city electric car have been formulated. The dependence of the resistance force of an electric car on the speed of the electric car on a horizontal road has been analyzed. The dependence of the value of the power of the mechanical energy that the drive wheels of the electric car should develop on the speed of the electric car has been calculated. The dependence of the amount of mechanical energy consumed by the drive wheels of the electric car on the speed of the electric car on a horizontal road for a distance that meets the requirements for the technical parameters of a cheap city electric car has been determined. Based on the technical parameters of the transmission of the car, the value of the maximum angular speed of rotation of the traction motor shaft at the maximum speed of the car in the highest gear of the gearbox has been determined. Based on the value of the power of mechanical energy that the drive wheels of a complete vehicle should develop when the vehicle moves along a horizontal road at maximum speed, the power of the traction motor is determined. A traction asynchronous electric motor and a frequency converter for it are selected. Based on the technical parameters of the passenger car transmission, the traction force of the drive wheels of the electric vehicle is determined, which corresponds to the nominal value of the mechanical torque of the traction motor on all gears of the gearbox. Also, based on the technical parameters of the passenger car transmission, the speed of the electric vehicle is determined, which corresponds to the nominal value of the angular velocity of the traction motor shaft on all gears of the gearbox. The maximum load moment on the traction motor shaft at the minimum speed of the vehicle in the first gear of the gearbox uphill on a road with a slope of 36% is determined. Based on the maximum load moment on the traction motor shaft, the requirements for the nominal parameters of the frequency converter are determined and a frequency converter for the traction asynchronous electric motor is selected. Based on the nominal parameters of the frequency converter, the requirements for the electrical parameters of the battery of the on-board source of electric energy of an electric vehicle have been formulated. The main technical parameters of the on-board source of electric energy of an electric vehicle have been calculated. The parameters of the traction electric drive of an electric vehicle have been synthesized. A mathematical model of the asynchronous traction electric drive of an electric vehicle has been developed. The mathematical model has been used to study the electromechanical transient processes that occur in the asynchronous traction electric drive of an electric vehicle during acceleration and braking of an electric vehicle.