New constant-frequency control

• Book ID: 103081800
• Publisher: Elsevier Science
• Year: 1953
• Tongue: English
• Weight: 74 KB
• Volume: 255
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(53)90767-4

✦ Synopsis

CURRENT TOV~CS 91

pass through a rotating baffle plate, the engineers explained. Beyond the baffle plate, the bars are brazed to strips of high-resistance metal, shaped to form a radial-blade fan. These fan blades, themselves, provide the higher rotor resistance necessary for high-slip characteristics. Thus, most of the rotor heat develops where there is a direct transfer to the cooling air, that is, outside the motor enclosure.

The engineers pointed out that the reduced heating within the motor enclosure allows a normal air gap between rotor and stator to be maintained. This reduces operating costs, they said, because there is no loss of electrical efficiency.

The Type KRX motor is available in 30 to 150 hp at 900 and 1200 rpm, 5-8 and 8-13 per cent slip. Voltage ratings are 220, 440 and 550.