Starting motor for large inertia load
First Claim
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1. An induction motor having a rotor disposed for rotation within an annular stator, said rotor comprising:
- a continuous circular metallic rim serving as a rotor winding;
a closed container of cooling fluid disposed adjacent and radially inward of said rim, said cooling fluid being in thermal communication with said rim to transfer thermal energy therfrom; and
a shaft concentrically disposed within said rim, a metallic web secured to said shaft for supporting said rim for rotation within said stator, said web being resilient to permit radial expansion of said rim in response to temperature changes therein.
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Abstract
A large starting motor is provided, especially for reversible, pumped storage water wheel generator-motor units, having a rotor member which comprises a relatively thin ferromagnetic rim and a closed container of cooling fluid disposed adjacent and radially inward thereof. Heat developed due to circulation of starting currents within the rim is conducted to the cooling fluid through the inside diameter surface of the rotor rim. Provision is made for venting and replenishing the cooling fluid which heats up and in extreme cases vaporizes in response to the thermal energy transferred from the rim.
20 Citations
16 Claims
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1. An induction motor having a rotor disposed for rotation within an annular stator, said rotor comprising:
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a continuous circular metallic rim serving as a rotor winding; a closed container of cooling fluid disposed adjacent and radially inward of said rim, said cooling fluid being in thermal communication with said rim to transfer thermal energy therfrom; and
a shaft concentrically disposed within said rim, a metallic web secured to said shaft for supporting said rim for rotation within said stator, said web being resilient to permit radial expansion of said rim in response to temperature changes therein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16)
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10. Apparatus comprising:
a synchronous dynamoelectric machine having a rotor on a shaft and an induction motor in accordance with claim 10 wherein said shaft of said synchronous dynamoelectric machine and said shaft of said induction motor are positioned in axial alignment and are mechanically coupled together for concurrent rotation.
Specification