BM series ronsists of three phase,asynchronous brake motors totally enclosedfan rooled.BM series range starts from 56 up to 160 frame size.The motor brakes in case of power supply failure.The brake torque remains the same in both directions of rotation and the motor brakes without shaft axialsliding.As standard the brake is DC wltage supply with abuilt-in rectifier fitted inside the terminalbox. The rectifier is provided with over-wltage and radio frequencies emission protection devices.Two differenttypesof rectifier wiring can be chosen according to twodifferentbrake intervention time.
BM series is designed inorder to have abraking actionas quiet as possible.BM series motors tolerate a high ovel1oading rate and are capable to withstand overheating so to guarantee best reliability also under toughoperating conditions. All MGM motors have been designed to be rontrolled by inverters.The motor winding insulation is class F, while class H is available on request.Motor constnrlion type is totally enclosed externally cooled and IP54 enclosure OP55 and IP56 available on request).
Motors up to 132 frame size are fitted as standard with a hexagonalhole on the shaft at nondrive endto allow manualrotation,even if power is off.Onrequest BM series motors canbe provided with side manual brake release lever.The brakedisc liningmaterialis asbesbi free and the lining mixture is formulated to have ahighfriction coefficient and long lasting.
BM series motor frame is made of die cast, light metal on motors up to 132 size and the terminal board box, provided with cable glands andplugs,is positioned 180oabove the motor support feet.The frame is made of cast ironstarting from 160 frame size and the terminal box is loca!Bd on the right side (drilf&.end view).Shields and flanges are made of aluminium on motors up to 90 frame size, and of cast Iron on motors of 100 frame size and above.OnIM B3 mounting (foot mounted) feet are frameIntegrated (they are not simply attached to the frame) as standard and it makes the motor very sturdy.This feature is very important for those applications where the motor is much stressed during the starts and stops.BM series main features are the low braking noise,gradual acceleration during the motor start and stopand reduced overalldimensions.