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原文传递 POWERING UP YOUR AC CURRENT DIAGNOSTIC SKILLS

题名：	POWERING UP YOUR AC CURRENT DIAGNOSTIC SKILLS
正文语种：	eng
作者：	DAVE HOBBS
作者单位：	BorgWarner Inc.
摘要：	If you know who (or what) "ELI the ICE Man" is, you're probably a commercial electrician or electrical engineer. If that applies, you might even consider skipping this article! Otherwise, what you don't know can hurt you, damage your test equipment and fool your diagnostics. AC (Alternating Current) is found inside alternators, coming out of sensors, and totally rules the worlds of HEVs, PHEVs, and BEVs. In spite of AC's varied uses in today's cars and trucks, most of us in the wrenching world are far more comfortable with our knowledge level of DC compared to AC.What exactly is AC, and why should you care?We've all been focusing on DC (Direct Current) for most of our automotive service careers, and rightfully so. DC is the flow of electrons in one direction. The direction of flow displayed in schematics (conventional flow theory of positive to negative) or the scientifically proven theory of electron flow (negative to positive) is mainly trivial for those of us in the automotive service world. AC is electricity that moves in both directions.The speed (frequency) at which it switches back and forth for household AC electrical power is 60 Hz in North America and 50 Hz in certain other parts of the world. Residential and light commercial AC voltage levels (Figure 1) are 120v and 240v (+/-10 volts), depending on whether the circuit is used for lower wattage appliances (i.e., lighting, televisions, etc.) or higher wattage appliances (i.e., electric water heaters, clothes dryers, etc.). But wait... this is "Motor Age Magazine" and not "Electrical Contractor Magazine," right? Right... but the automotive world is taking a VERY fast turn to vehicle electrification. Knowledge of 3-phase AC power inverters, AC induction motors and off-board charging equipment for PHEVs (Plug-in Hybrid Electric Vehicles) and BEVs (Battery Electric Vehicles) needs to become yet another area of expertise for the professional automotive repair technician! Bluntly put... if you shy away from learning some of the same concepts your buddies in the electrical contracting world already know, you're going to fall behind in your ever-changing automotive world!
出版年：	2022
期刊名称：	Motor age
卷：	141
期：	2
页码：	15-16,18-20