Cage rotor

Table 2.1 Typical angles of skew for cage rotors...

Squirrel cage fan A fan with a squirrel cage rotor, which has the advantages of low cost, low maintenance, and sturdiness. 

When the motor first starts there is a sudden surge of current into the stator winding (inrush current). This is usually 6 to 6.5 times the amps the motor sees when it is running. This causes similar surge in the squirrel cage rotor hars, so great care must he taken to size all the hars, WMC uses copper hars, correctly. This magnetic circuit in the rotor induces a current thus, the name induction motors. 

This is of general importance, with a special reference to the bare parts of a cage rotor, and establishes an additional limit for the (insulated) windings. The rotor of a squirrel cage motor shall exceed neither +300°C nor the temperature limit of the corresponding temperature class. These values shall not be exceeded even during starting. 

The main circulation pump (pump) is intended for providing the sodium circulation in primary circuit. The pump is centrifugal, vertical arrangement, single-stage, console, sealed, electrically driven type. Motor — asynchronous, double-speed, vertical arrangement with squirrel-cage rotor. 

There are two types of induction motor rotor - the wound rotor and the cage rotor. The cage rotor consists of a laminated cylinder of silicon steel with copper or aluminium bars slotted in holes around the circumference and short-circuited at each end of the cylinder, as shown in Fig. 2.50. In small motors the rotor is cast in aluminium. Better starting and quieter running are achieved if the bars are slightly skewed. This type of rotor is extremely robust and since there are no... 

A cage rotor is used on single-phase a.c. motors, the turning force being produced in the way described previously for three-phase induction motors and shown in Fig. 2.49. Because both windings carry currents which are out of phase with each other, the motor is known as a split-phase motor. The phase... 

Any motor containing a cage rotor such as that shown in Fig. 3.23 does suffer from a iow starting torque. Therefore an induction motor must be matched to the... 

The solid construction of the cage rotor used in many a.c. machines makes them almost indestructible. 

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