Permanent Split Capacitor Motor


Thread Starter


Is increasing the capacitance of the capacitor also increase the rpm? Please explain how it works.
Responding to Dboy's Oct 12, 10:53am query... increasing capacitor size will increase RPM, but only marginally.

You are probably aware that the major advantage of the permanent-split capacitor motor is its reversibility. And, because both windings are
identical, the capacitor is sized to provide a reasonable starting torque. Consequently, running torque is low and speed regulation poor.

Capacitor Influence.
Size is a compomise. The capacitor is sized to provide 'good' voltage regulation between say 50 and 120% of full load.

Increasing capacitor size increases speed, but only if the capacitive-reactance offsets the inductive-reactance component of te supply cable voltage-drop.

Phil Corso, PE {Boca Raton, FL, USA}
[[email protected]] ([email protected])