🔍 Key Concepts

• How a portable growler creates an alternating magnetic field in the stator iron when connected to a 120 VAC, 60 Hz source • Why a shorted turn/shorted stator coil allows current to circulate and builds up strong alternating flux in that particular slot • How a steel feeler (hacksaw blade) reacts when it is in a region of strong alternating magnetic flux versus a region with little or no flux

💭 Think About

• When the growler energizes the stator, in which slots will there be the strongest alternating magnetic field: those with a healthy coil, an open coil, or a shorted coil? • What mechanical effect does a rapidly changing magnetic field have on a thin steel strip placed in that field—does it tend to stay still, or does it try to move and buzz? • If a coil is open (no complete circuit), can significant current flow and create the same strong alternating field as a shorted coil?

✅ Before You Answer

• Identify which condition (normal, open, or shorted coil) produces the largest induced current and therefore the strongest local alternating flux • Match the description of the feeler’s behavior: vibrates and growls vs. remains motionless/quiet • Confirm that the growler test is specifically designed to locate shorted turns, not open circuits, by the feeler’s reaction over the affected slot