Electric Vehicle Electromagnetic Torque Drive System

Abstract

The invention relates to a driving system of an electric vehicle, in particular to an electromagnetic variable-torque driving system of an electric vehicle. The electromagnetic variable-torque driving system comprises an electromagnetic variable-torque driving device, a power cell, an electronic controller, a three-phase bridge type full control inverter circuit and a three-phase rectification circuit, wherein the electromagnetic variable-torque driving device comprises a three-phase separate excitation type synchronous motor and an electromagnetic variable-torque motor, and a rotor of the three-phase separate excitation type synchronous motor is connected with an inner rotor of the electromagnetic variable-torque motor; the power cell is connected with an input end of the three-phase bridge type full control inverter circuit, and an output end of the three-phase bridge type full control inverter circuit is connected with an armature winding of the three-phase separate excitation type synchronous motor; a magnetic pole winding of the inner rotor of the electromagnetic variable-torque motor is connected with an excitation winding of the three-phase separate excitation type synchronous motor through the three-phase rectification circuit, and an outer rotor of the electromagnetic variable-torque motor is connected with a hub. According to the electromagnetic variable-torque driving system disclosed by the invention, a completely new concept of electromagnetic variable-torque drive is provided, the electromagnetic variable-torque drive is realized through a specific structure, and an electric wheel of the electromagnetic variable-toque drive can have a great market application prospect.

Description

technical field [0001] The invention relates to a drive system of an electric vehicle, in particular to an electromagnetic variable torque drive system of an electric vehicle. Background technique [0002] A common internal combustion-powered vehicle converts the chemical energy of gasoline or diesel into thermal energy, and then converts the thermal energy into mechanical energy that drives the vehicle forward. This method has a problem of low thermal efficiency. Taking gasoline engines as an example, even with turbocharging or VVT variable valve timing technology, etc., the thermal efficiency conversion is at most 30% (the thermal efficiency of diesel is high, but only about 40%) , most of the rest of the heat energy has become engine heat or the brake heat energy during braking has been released in vain. And the thermal efficiency value of the wheel drive after passing through the gearbox and the final drive is even lower, at most 5%-10%. Heat energy is released in vain...

AI Technical Summary

Problems solved by technology

The above two driving methods have their own advantages and disadvantages: in order to obtain a large starting torque when a direct drive electric vehicle starts and accelerates, it must provide a driving current several times the rated current to the motor

This also increases the manufacturing difficulty and cost of the drive system

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