1MR376B-B225 Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
MPN: R911258242
No Tariffs On US Orders- Straightforward Pricing: No Rush Fees, No Credit Card Fees
Current response time:
3 Minutes
0 Seconds
The Bosch Rexroth Indramat 1MR376B-B225 is a rotor for 1MB Frameless Spindle Motors from the 1MB High-Speed Asynchronous Motors series. It features a 225 mm inner rotor diameter, screw fastening mounting method, and two supplied type plates. The rotor has threaded bores for balancing rings, is designed without a rotor sleeve, and provides IP00 protection.
To contact sales for pricing and lead time:
Payment Methods
Shipping Methods
Our Credentials
Product Description:
The 1MR376B-B225 is a rotor subassembly manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. It serves as the rotating element inside frameless spindle motors used in machine tools and other automation equipment that require high peripheral speed and low inertia. Because only the rotor is supplied, it can be integrated directly into a custom housing, which saves axial space and supports compact spindle layouts. This arrangement is useful in spindle designs where the motor is built into the machine structure instead of being installed as a complete housed unit.
The rotor’s balancing system relies on threaded bores so screws can be added or removed to fine-tune residual unbalance after final assembly. Its degree of protection is rated at IP00, so the completed spindle must provide its own enclosure and cooling path. An inner rotor diameter of 225 mm matches large-frame stators and permits a wide through-bore for tool clamping systems or media supply lines. This layout can also leave more room for internal spindle components that pass through the shaft center. Mechanical retention uses screw fastening, creating a rigid connection between the rotor stack and the shaft flange without welding or adhesives. The motor length code is B, which corresponds to the active lamination length and helps match the rotor to a compatible stator section within the product range.
The core is built without a rotor sleeve, which reduces weight and eddy-current losses but requires thermal shrink-fitting to the shaft for secure operation at speed. It ships with two type plates that carry serial and parameter data, preserving traceability if one plate is removed during spindle balancing. The part is intended for integration into a frameless spindle motor assembly in which the surrounding housing, bearing arrangement, and protective enclosure are supplied separately. Because those support parts are external to the rotor, the final spindle design determines how the assembly is enclosed and cooled during operation.
