Description: Brake Motors are suitable for applications that requires instantaneous stopping of the driven load. These motors are offered in frame sizes ranging from 63m to 225m. The motor works on 'fail safe' type operation wherein the brake is applied, when, power to the motor is switched off or when the power failures. These brake motors is formed with an integral combination of an A.C. induction motor and a disc type, fail safe, electromagnetic brake unit. The brake motors comprises of A.C. induction motor, encapsulated brake coil housed in the non-driving end end-shield, brake liner attached to the armature disc at its interface with the cooling fan, and cooling fan. The rectifier unit is provided inside the terminal box which converts A.C. supply into D.C supply for brake coils. The working of these brake motors is very simple. Under no power condition brake springs keep the brake liner pressed against the cooling fan. This prevents rotor shaft rotation, because, the fan is keyed to it. When power is switched on, the brake coil gets energized by the rectifier unit. It instantly attracts armature disc by overcoming the spring force. This action results in releasing of the fan allowing the rotor to rotate freely. When power fails or when it is switched off, the brake coil gets de-energized. This results in the spring pressing the brake liner against cooling fan by returning armature disc to its original position. This causes almost instantaneous braking of rotor. These motors are very simple and rugged-in construction, and hence need very little maintenance. In the rare events of failure, repair is simple and easy. It needs no seperate D.C supply for brake coil energisation, because a rectifier unit is provided. The rectifier is open type and fixed between the two terminals inside the terminal box. Being open type, it ensures good heat dissipation and is very easy to replace.
Other Catalogs (From Navyug Electric Motors & Pumps Ltd) :
