AC Motors Capacitor

Oriental Motor's AC motors designed for a single-phase power supply are all permanent-split capacitor motors. Permanent-split capacitor motors contain an auxiliary winding offset by 90 electrical degrees from the main winding. The capacitor is connected in series with the auxiliary winding, causing the advance of current phase in the auxiliary winding.
Motors primarily use vapor deposition electrode capacitors as specified in JIS C 4908 Capacitors for Electrical Equipment. This type of capacitor is also commonly referred to as a SH (Self Healing) capacitor because a metal-deposited plastic film is used for its components, which has a self-healing effect.

Capacitance

The use of a capacitor with a different capacitance may cause excessive motor vibration and heat generation or may result in torque drops and unstable operation. Be sure to use the capacitor included with the motor. The capacitor's capacitance is expressed in microfarads (μF).

Rated Voltage

Using a capacitor exceeding the rated voltage may cause damage and the capacitor may smoke or ignite. Be sure to use the capacitor included with the motor. The rated voltage of the capacitor is expressed in volts (V). The capacitor’s rated voltage is indicated on the surface of the capacitor case. Take proper precautions, since the capacitor's rated voltage is different from that of the motor.

Rated Conduction Time

The rated conduction time is the min. design life of the capacitor when operated at the rated load, rated voltage, rated temperature and rated frequency. The standard life expectancy is 40,000 hours. A capacitor that breaks at the end of its life expectancy may smoke or ignite. We recommend that the capacitor be replaced after the rated conduction time.
Consider providing a separate protective measure to prevent the equipment from being negatively influenced in the event of capacitor failure.

Safety Mechanism of Capacitor

Some capacitors are equipped with a safety mechanism that allows for safe and complete removal of the capacitor from circuits to prevent smoke and/or fire in the event of a dielectric breakdown. Oriental Motor products use capacitors with UL Standards recognized safety mechanisms that have passed the UL 810 requirement of a 10,000 A fault current test.