1MR270C-A090
1MB High-Speed Asynchronous Motors
The 1MR270C-A090 rotor is manufactured by Bosch Rexroth Indramat and belongs to the 1MB High-Speed Asynchronous Motors series. It is supplied as a rotor for a 1MB frameless spindle motor, intended to generate the rotating magnetic field inside high-speed machine-tool spindles and other precision drives. The component is built with a step interference fit so that it mates securely with the laminated stator and shaft assembly.
The rotor pairs with a 380 V stator winding and draws a rated current of 96 A, enabling a rated power output of 30 kW under continuous operating conditions. Its electrical inductance is 1.25 mH, which affects the stator current rise time and the design of the matching inverter filter network. When assembled in a full motor the rotor supports a rated speed of 1500 min-1, allowing the spindle to maintain consistent cutting speeds during heavy machining cycles. The C length code specifies the axial stack height, while a minimum conductor cross-section of 35 mm² is recommended for supply leads to limit resistive losses. With a mass of 52 kg, appropriate lifting fixtures are required during installation.
Mechanical behavior is defined by a rated torque of 190 Nm, delivered through a rotor moment of inertia of 0.258 kgm² that balances acceleration capability with rotational smoothness. The inside rotor diameter of 90 mm provides the clearance needed for the hollow-shaft clamping system common to cartridge spindle assemblies. Because the component follows frame size 270, dimensional compatibility with other elements of the 1MB series is assured without custom spacers. Together these features allow the rotor to transmit high torque at controlled speed while maintaining thermal stability in continuous-duty spindle service.
Technical Specifications
Cooling Method
Water Cooling
Cooling Mode
IC3W7
Degree Of Protection
IP00
Frame Size
270
Inductance
1.25 mH
Inside Rotor Diameter
90 mm
Max Mechanical Speed
12000 min-1
Min Conductor Cross-section
35 mm2
Motor Length Code
C
Product Type
Rotor for 1MB Frameless Spindle Motor
Rated Current
96 A
Rated Power
30 kW
Rated Speed
1500 min-1
Rated Torque
190 Nm
Rated Voltage
380 V
Rotor Design
with step interference fit
Rotor Inertia
0.258 kg·m²
Rotor Mass
53.3 kg
Rotor Moment Of Inertia
0.258 kgm2
Thermal Class
155 (F)
Common Misspellings
Shipping & Payment Options
Warranty
Repair
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