MGM
37
BM series consists of three phase, asynchronous brake motors totally enclosed fan cooled (TEFC). 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 axial sliding. As standard the brake is DC voltage supply with a built-in rectifier fitted inside the terminal
box. The rectifier is provided with over-voltage and radio frequencies emission protection devices. Two different types of rectifier wiring
can be chosen according to two different brake intervention time.
BM series is designed in order to have a braking action as quiet as possible. BM series motors tolerate a high overloading rate and are
capable to withstand overheating so to guarantee best reliability also under tough operating conditions.
All MGM motors have been designed to be controlled by inverters. The motor winding insulation is class F, while class H is available on
request. Motor construction type is totally enclosed externally cooled and IP54 enclosure (IP55 and IP56 available on request).
Motors up to 132 frame size are fitted as standard with a hexagonal hole on the shaft at non drive end to allow manual rotation, even if
power is off. On request, BM series motors can be provided with side manual brake release lever. The brake disc lining material is asbestos
free and the lining mixture is formulated to have a high friction 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
and plugs, is positioned 180
°
above the motor support feet. The frame is made of cast iron starting from 160 frame size and the terminal
box is located on the right side (drive-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. On IM B3 mounting (foot mounted) feet are frame integrated (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 stop and reduced overall dimensions.
General Characteristics
BM series