Abstract
Many studies have been conducted to reduce the cogging torque of electric power steering motors. However, in the mass production of such motors, it is essential to enhance performance robustness in relation to tolerances. For such motors, this work analyzes performance robustness in relation to tolerances by applying a cycloid curve to the surface magnet of the rotor. Applying a cycloid curve to the magnet surface of the rotor is one of several ways to reduce cogging torque. To evaluate the performance of the cycloid curve, we compare it with an eccentric curve. The two curves are compared for the same specifications and evaluated using the indicator, tolerance insensitivity rate, which is used to assess performance robustness in relation to tolerances. The cycloid curve was evaluated to be more robust in relation to tolerances, as compared with the eccentric curve. Finally, an experiment was conducted to validate the robustness of the cycloid curve.
Highlights
Because of environmental pollution, vehicle emission regulations are becoming increasingly tightened; interest in eco-friendly vehicles, such as electric and hybrid vehicles, that can reduce exhaust gas emissions is increasing [1]
(CET) occurs when the fixed point that draws trajectories on the rolling circle is inside the rolling circle, whereas prolate epitrochoid (PET)
When drawing the trajectory based on a fixed point of the rolling wheel located at the outermost edge, the drawing the trajectory based on a fixed point of the rolling wheel located at the outermost edge, the geometric shape generated by the red line becomes an epicycloid curve
Summary
Vehicle emission regulations are becoming increasingly tightened; interest in eco-friendly vehicles, such as electric and hybrid vehicles, that can reduce exhaust gas emissions is increasing [1]. ItThe was verified that cogging was improved tolerances to to reduce cogging torque cycloid cycloid and and eccentricity eccentricity curves are are analyzed. We analyze a case in which shape of aofrotor; it defined isitchange defined the distance between rotor radius and the point intersection shape ofperformance a rotor; it is as as theas distance between thethe rotor radius and the point of of intersection shape a rotor; is defined the distance between the rotor radius and the point of intersection reduce cogging torque the thesame same tolerance tolerance occurs occurs inincontacts cycloid cycloid and and eccentric eccentric rotor rotor shapes. The effects cogging torque on the tolerances in work the same tolerance occurs in cycloid and eccentric rotor shapes.
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