The fail safe AC disc brakes are very compact and modern in design. Foundation is not necessary as they are directly mounted on non-driving end shaft of the motor. A typical assembly consists of liner plates (brake disc) with square hole at the centre. One corresponding piece of square hub is supplied with the brake. This hub is keyed to the motor shaft and the liner plate is free on this hub. Normally liner plate is gripped between two discs with the help of spring pressure. The brake works on 230/415 V AC supply. When the current is supplied to the brake, one disc is attracted by the electromagnet against pressure and the liner plate is released. Thus the brake is "Off". Once the brake is set it dose not require adjustment or maintenance. Only when the liner plates wear-off with use, the air gap is required to be maintained periodically. An arrangement to release the brake manually could be provided on request. These brakes are widely used in machine tools, hydro extractors, coil winding machines, wire drawing machines, rubber mixing mills, rolling mills, material handling equipment and many other industries.
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