A metal cylinder will work as rotor, but to improve efficiency a " squirrel cage " rotor or a rotor with closed windings is usually used.
22.
Available squirrel cage induction motor starting methods include direct-on-line starting, reduced-voltage reactor or auto-transformer starting, star-delta starting or, increasingly, new solid-state soft assemblies and, of course, VFDs.
23.
"' Forward-curve "' This " squirrel cage " impeller generates the highest volume flow rate ( for a given tip speed ) of all the centrifugal fans.
24.
At low speeds, the current induced in the squirrel cage is nearly at line frequency and tends to be in the outer parts of the rotor cage.
25.
The number of bars on the squirrel cage determines to what extent the induced currents are fed back to the stator coils and hence the current through them.
26.
Unlike the DFIG, the FRC can employ a squirrel cage rotor in the generator; an example of this is the Siemens SWT 3.6-107, which is termed the industry workhorse.
27.
A blower, in the shape of a drum fan ( also called a " squirrel cage " ), pulls the warm humid air from the room across the coils.
28.
The squirrel cage winding in some machines provides a damping effect for load or system disturbances, and in this role may be designated as an " amortisseur " windings.
29.
Large motors operating on commercial power frequency include a " squirrel cage " induction winding which provides sufficient torque for acceleration and which also serves to damp oscillations in motor speed in operation.
30.
The motor used to drive the pump is typically a three phase, squirrel cage induction motor, with a nameplate power rating in the range 7.5 kW to 560 kW ( at 60 Hz ).
