| 초록 |
EPS(Electric Power Steering), whose merits include fuel efficiency, driver\'s convenience, environmentalfriendliness, and reliable maintenance, has continuously evolved to achieve high power, low friction, noise, and ripple. The motor embedded in EPS accounts for a major portion of the required characteristics. Hence, many studies on EPS and motors have been conducted and are ongoing. Steering systems should satisfy global regulations, especially UN R79 for type approval prior to manufacture and sale. This paper focuses on motor failure cases, consequently resulting in braking torque. For the theoretical explanation, mathematical models were derived, and a simulation program was developed to apply to various expected projects. Simulation results under various operational environments in which EPS was applied were verified through measurements and experiment results. Based on this study, the developing system can be analyzed to satisfy the UN regulation in terms of braking torque at the early stage of development, and may choose a dual wound motor to lower the braking torque, if required. |
