MRT450B-3N-0350-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRT450B-3N-0350-NNNN is a three-phase synchronous motor in the MRT Synchronous IndraDyn T Motors series. Designed as an open kit motor, it has a maximum mechanical speed of 1400 rpm and a protection class of IP00. The motor uses screw fastening, supports a mounting radial force of 1660 Newtons, and its rotor has an inside diameter of 350 mm.
Internal Product Review
The MRT450B-3N-0350-NNNN is an open three-phase synchronous kit motor designed for precise direct-drive integration. Its 1400 rpm maximum mechanical speed and 0.45 kg·m² rotor inertia support stable motion behavior in demanding servo applications. IP00 construction suits protected installations, making this motor a strong choice for engineered machine assemblies.
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Product Description:
The MRT450B-3N-0350-NNNN is a frameless torque motor supplied by Bosch Rexroth Indramat within the MRT Synchronous IndraDyn T Motors series. Delivered as an open stator-rotor kit, the unit is intended for direct integration into rotary tables, printing drums, or gearless spindle drives where high continuous torque and precise electrical commutation are required. By eliminating a housing and bearings, the motor allows machine builders to embed synchronous drive capability directly into the host structure and streamline overall drivetrain complexity.
Its mechanical limit speed reaches 1400 rpm, which is the maximum permitted speed before centrifugal stresses exceed the motor's design margins. Because the assembly is an open kit, its protection rating is IP00, so the machine frame must provide an enclosure and suitable cooling. A minimum air gap of 0.30 mm between the rotor and stator must be maintained to avoid contact caused by thermal expansion. During installation, the stator is secured with screws, and the hub can withstand up to 480 N of axial force and 1660 N of radial force without distorting the laminated core. The motor has 30 pole pairs, enabling high torque output at low rotational speeds while keeping the drive frequency within standard inverter ranges.
Rotor-related values support inertia matching for servo control loops. The laminated hub has a moment of inertia of 0.45 kg·m², so this value must be considered when calculating acceleration profiles. An inside diameter of 350 mm leaves a large passage for cabling, optics, or material flow through the motor bore. The steel stack weighs 13.0 kg, and the specified operating radial force of 770 N must be considered for vertical mounting. Twelve M8 studs, each 18 mm deep, anchor the rotor to the machine flange and provide slip-free coupling during continuous operation with the three-phase synchronous winding.
