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Squirrel-cage rotor
A squirrel-cage rotor is the rotating part (rotor) used in the most common form of AC induction motor. It consists of a cylinder of steel with aluminum or copper conductors embedded in its surface. An electric motor with a squirrel-cage rotor is termed a squirrel-cage motor.
== Structure ==
The motor rotor shape is a cylinder mounted on a shaft. Internally it contains longitudinal conductive bars (usually made of aluminum or copper) set into grooves and connected at both ends by shorting rings forming a cage-like shape. The name is derived from the similarity between this rings-and-bars winding and a squirrel cage.
The solid core of the rotor is built with stacks of electrical steel laminations. Figure 3 shows one of many laminations used. The rotor has a smaller number of slots than the stator and must be a non-integer multiple of stator slots so as to prevent magnetic interlocking of rotor and stator teeth at the starting instant.〔theory and performance of electrical machines, J.B.Gupta〕
The rotor bars may be made either of copper or aluminum. A very common structure uses die cast aluminum poured into the rotor after the laminations are stacked. Some larger motors have aluminum or copper bars which are welded or brazed to end-rings. Since the voltage developed in the squirrel cage winding is very low, no intentional insulation layer is present between the bars and the rotor steel. 〔 Gordon R. Slemon, ''Magnetoelectric devices'', John Wiley and Sons 1966 pp. 384-389〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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