| 摘要 |
PURPOSE:To improve the efficiency by insulating a rotor core and a squirrel- cage secondary winding formed by filling melted conductor, and flowing the secondary current in the prescribed loop. CONSTITUTION:A rotor core 11 is formed by laminating many steel plates, and a plurality of slots 12 for a quirrel-cage winding are formed at the prescribed interval. An electrically insulating coating is formed on the surface of the core 11. Melted conductor such as aluminum is filled in the slots 12, and the squirrel- cage secondary winding of aluminum is integrally formed with the core 11 thus coated to form a squirrel-cage rotor. Since the core 11 and the winding are sufficiently electrically insulated therebetween, the secondary current is flowed in the prescribed route even if the contacting degree therebetween increases. |
