AC Gearmotors

• Can motors and fans with a power supply voltage of 100V AC be used with an AC110V power supply?
• What applications are ACSC motors best used for?
• Is the surge suppression CR circuit "EPCR1201-2" shown in the wiring diagram of the circuit product necessary?
• The AC motor is very hot. Is this normal?
• Why do single-phase AC motors need capacitors?