Single phase motors -Capacitor-start/Capacitor run motors (CSCR)-
Known as a CSCR motor for short, this type of motor combines the best features of the Capacitor-start/ Induction run motor and the permanent-split capacitor motor. Even though their construction makes them somewhat more expensive than other single-phase
motor types, they are the perfect choice for demanding applications. A CSCR motor has a start-type capacitor in series with the starting winding, just like the capacitorstart motor. This provides high starting torque. CSCR motors also resemble Permanent-split capacitor (PSC) motors insofar as they have a run-type capacitor which is in series with the starting winding once the start capacitor is switched out of the circuit. This means
that the motor can handle high breakdown or overload
torque.
CSCR motors can be designed for lower full-load currents and higher efficiency. One of the advantages of this feature is that it allows the motor to operate at smaller temperature rises than other, similar single phase motors.
CSCR motors are the most powerful single-phase motors and can be used for quite demanding applications, e.g. high-pressure water pumps and vacuum pumps and other high-torque applications which require 1.1 to 11 kW.
CSCR motor. Schematic diagram and torque/speed curve
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