Which winding terminals on a single phase compressor typically have the highest resistance?

When assessing the winding terminals on a single-phase compressor, the run to start terminals typically exhibit the highest resistance. This is largely attributed to the operational design of the compressor, where the run winding is usually designed to handle continuous operation, while the start winding is intended for brief bursts of high torque during the initial startup phase.

The run winding is built for higher efficiency and lower resistance, allowing it to sustain operation effectively. In contrast, the start winding, which helps initiate the compressor's operation when power is first applied, generally has a higher resistance to limit the current that flows through it. After the compressor reaches a sufficient speed, the start winding is usually disconnected. The contactor that disconnects the start winding at run time takes measures to ensure that only the run winding is powered for continuous operation.

Therefore, comparing the resistances, the run to start winding configuration will show a notable difference, with the start winding exhibiting higher resistance than the run winding but still contributing to an overall higher measurable resistance between the run and start terminals. This is why selecting the run to start terminals indicates a scenario where the highest resistance will likely be observed.