Flexible electromagnetic coupling torque transmission method for electric automobile

Abstract

The invention discloses a flexible electromagnetic coupling torque transmission method for an electric automobile, which belongs to the technical field of modern traffic. The flexible electromagnetic coupling torque transmission method for the electric automobile is characterized in that a current control signal is generated according to parameter information such as current speed, shift and the like in a torque transmission control process after a control module receives a torque transmission command; a driving module gradually increases a break-over electric current of an excitation windingof an outer rotor according to the current control signal; magnetometive force of the excitation winding is gradually increased along with the increment of the break-over electric current; interaction force between a magnetic field of the excitation winding and a magnetic field of a permanent magnet of an inner rotor is gradually increased; a transmitted torque is increased gradually; a driven shaft is stably speeded up until the rotation speeds of a driving shaft and the driven shaft are synchronous; in a torque interrupt control process, after the control module receives a torque interrupt command, the output of the current control signal is interrupted; current output of the driving module is zero; the magnetomotive force of the excitation winding is zero; the electromagnetic connection between the outer rotor and the inner rotor is interrupted; and the transmitted torque is zero. The invention has the following advantages of solving the problems of heat generation by friction and mechanical wear and having high response speed and an overload protection function.

Description

technical field [0001] The invention belongs to the technical field of modern transportation, and relates to a torque transmission method, in particular to a flexible electromagnetic coupling torque transmission method for an electric vehicle. Background technique [0002] The power output shaft of the drive motor for electric vehicles needs to be connected with the transmission input shaft through the power transmission device to complete the torque transmission. At present, the torque transmission methods mainly include torque transmission by clutch, torque transmission by magnetic coupling and torque transmission by rigid connection. Clutches rely on mechanical friction to transmit torque, which will inevitably cause frictional heat and mechanical wear, and there is an idle stroke during the coupling process, and the response speed is slow; magnetic couplings rely on the electromagnetic force between the permanent magnets embedded in the inner and outer rotors to transmit...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a flexible electromagnetic coupling torque for electric vehicles in view of the shortcomings of the clutch relying on mechanical friction to transmit torque caused by frictional heat generation and mechanical wear and the lack of slow response caused by idle travel during the combination process. The transmission method uses the interaction force between the magnetic field generated by the excitation winding of the outer rotor and the magnetic field of the permanent magnet of the inner rotor to transmit torque; by controlling the current of the excitation winding to gradually change the interaction force between the inner and outer rotor magnetic fields size, so as to realize the stable increase of the transmitted torque and the power interruption function; in the case of overload, the inner and outer rotors will slide relative to each other to protect the power source

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