Assistant made it onto virtually every manner of hardware at the show, from TVs to refrigerators to electric bike wheels.
It was silver, with a rotating electric wheel throwing red, blue, green and yellow light not only onto the shimmering aluminum boughs, but also onto the walls and ceiling of our second-floor apartment in Jersey City.
To verify the theoretical analysis, the bench experiment of electric wheel system is conducted and vibration responses are acquired.
With the introduction of in-wheel motor, the electric wheel system encounters new vibration problems brought by motor torque ripple excitation.
The experiment demonstrates the high frequency vibration phenomenon of electric wheel system and the measured order features as well as main resonant frequencies agree with simulation results.
Brushless, internally geared (12 1 step-down gear ratio) electric wheel-hub motors (5kw of power each) provide propulsion; just start pedaling, and the motors engage, not unlike some electric-assisted cargo bikes.
The Project P.U.M.A. prototype vehicle integrates a lithium-ion battery, digital smart energy management, two-wheel balancing, dual electric wheel motors, and a dockable user interface that allows off-board connectivity.
The analysis indicates that torque excitation of in-wheel motor is prone to arouse horizontal vibration, in which in-phase rotational, anti-phase rotational and horizontal translational modes of electric wheel system mainly participate.
In order to analyze new vibration characteristics of electric wheel system, torque ripple of in-wheel motor based on motor module and vector control system is primarily analyzed, and frequency/order features of the torque ripple are discussed.
