MRS381B-1N-0240-NNNN Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
The Bosch Rexroth Indramat MRS381B-1N-0240-NNNN is part of the MRS Synchronous IndraDyn H Motors series and is designed as a standard rotor with a plain drilling mounting style. It has an internal diameter of 240 mm, insulation class F, and a protection rating of IP00. The rotor operates within an ambient temperature range of 0 to 40°C.
Internal Product Review
The MRS381B-1N-0240-NNNN is an IndraDyn H synchronous spindle motor rotor with a standard design variant and plain drilling mounting. Class F insulation and IP00 protection make this rotor a well-suited choice for controlled spindle assemblies requiring dependable integration.
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Product Description:
The MRS381B-1N-0240-NNNN is a rotor element produced by Bosch Rexroth Indramat for the MRS Synchronous IndraDyn H Motors series. Installed at the center of a synchronous spindle motor, this component carries permanent magnets that interact with the stator’s three-phase electromagnetic field to generate precise and responsive torque. The rotor converts this electromagnetic force into mechanical rotation, allowing high-speed machining spindles and automated tool changers to maintain consistent velocity under changing cutting loads. Its balanced form also helps limit runout and vibration during rapid acceleration or sustained high-speed operation.
The rotor has a core diameter of 240 mm, which establishes the magnetic surface area available for torque production and supports the required air gap between the rotor and stator. A smooth rotor bore passes through the shaft axis without splines or keyways, making the component suitable for thermal shrink-fit assembly in high-speed spindle systems. Peripheral fastening uses a plain hole pattern with through-holes that accept customer-supplied fasteners for extraction fixtures or balance weights. The rotor has a frame length code of B, placing its axial stack length between the shorter and longer versions available for this motor platform. Its heat-resistant laminations meet insulation class F, helping the rotor retain its magnetic and electrical properties during continuous operation at elevated internal temperatures. These laminations also reduce eddy-current losses as the magnetic field changes at high rotational speeds.
The rotor has an ingress protection rating of IP00, so it provides no independent protection against contact, dust, or moisture and must be installed within a suitable motor housing. It uses a standard configuration without balancing rings, encoder targets, or auxiliary cooling ducts. Reliable operation is supported within an ambient temperature range of 0 to 40 °C, which is suitable for the conditioned interiors of many CNC machines and industrial enclosures. As part of the IndraDyn H synchronous spindle platform, the rotor has magnetic polarity, inertia, and mechanical tolerances suited to field-oriented motor control. Proper alignment with the matching stator and spindle shaft helps maintain an even air gap, stable torque production, and controlled acceleration throughout the operating range.
