Electromagnetic variable-torque driving system of electric vehicle

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 torque variable drive system of an electric vehicle. Background technique [0002] The general internal combustion powered automobile converts the chemical energy of gasoline or diesel into heat energy, which is converted into mechanical energy to drive the car forward. This method has a problem of low thermal efficiency. Taking gasoline engines as an example, even turbocharging or VVT variable valve timing technology, etc., can convert up to 30% thermal efficiency (diesel thermal efficiency is high, but only about 40%) , Most of the remaining heat energy is turned into engine heat or brake heat during braking is released in vain. The thermal efficiency value of the wheel drive through the gearbox and final drive is lower, at most 5%-10%. Heat energy is released in vain, which is the efficiency loss of common cars represented by gasoline (diesel). And driv...

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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