MS2M04-A0FNN-KMDH0
MS2M Ultra Compact Motors
The MS2M04-A0FNN-KMDH0 is an ultra-compact synchronous servo motor manufactured by Bosch Rexroth Indramat within the MS2M Ultra Compact Motors series. It fits light- to mid-duty feed axes where space, wiring access, and heat dissipation are constrained. By pairing its low-inertia rotor with a high-resolution optical encoder, the motor supplies fast response and accurate position feedback to the associated drive controller. Because it is supplied without a holding brake, external mechanical locking or continuous drive torque must secure vertical or suspended loads.
The motor delivers a continuous mechanical output of 0.75 kW at the rated shaft speed of 3000 rpm. Under these nominal conditions it produces 2.39 Nm of torque while drawing 4.1 A from the drive amplifier. The torque constant is 0.59 Nm/A at 20 °C, allowing the controller to predict torque from phase current with fine granularity. Dynamic motion is enabled by five pole pairs and a low rotor inertia classification that minimize acceleration lag. Environmental protection reaches IP65, so the housing blocks dust ingress and water jets when the cable and M17 SPEEDCON connectors are properly mated. An operating envelope between 0 °C and 40 °C assures thermal stability when only natural convection is available.
During transients the drive may supply up to 12.3 A, letting the motor reach a peak torque of 7.16 Nm for rapid indexing or short overloads. Electrical properties that shape current rise include a phase inductance of 5.10 mH and a phase resistance of 0.57 Ω measured at 20 °C. The encoder provides 23-bit single- or multiturn feedback and operates on a 4.75 to 5.25 V supply, while its discharge capacity of 0.97 nF supports electromagnetic compatibility. Mechanical details comprise frame size 4, frame length A, and a plain shaft without a sealing ring; a double metal lead-wire cable routes power and signal separately. Natural convection cooling keeps the sound pressure level at 65 dB(A).
Technical Specifications
Connectors
M17; Quick lock SPEEDCON
Cooling Mode
Natural Convection
Discharge Capacity
0.97 nF
Encoder
Optical Encoder (23 Bit)
Encoder Design
Single/Multiturn
Frame Length
A
Frame Size
4
Holding Brake
Without Brake
Leadwire Cable
Double Cable Metal
Maximum Current
12.3 A
Maximum Torque
7.16 Nm
Operational Temp Range
0 to 40 Celsius
Phase Inductance
5.10 mH
Phase Resistance (20°c)
0.57 Ω
Pole Pairs
5
Product Group
Ultra Compact Motor
Protection Type
IP65
Rated Current
4.1 A
Rated Power
0.75 kW
Rated Speed
3000 rpm
Rated Torque
2.39 Nm
Rotor Inertia
Low Motor Inertia
Shaft
Plain Shaft, without shaft sealing ring
Sound pressure level
65 dB(A)
Supply Voltage Range
4.75 to 5.25 V
Torque Constant (20°c)
0.59 Nm/A
Voltage Constant (phase, 20°c)
20.7 mV/rpm
Winding
3000 min-1
Frequently Asked Questions
Internal Product Review
The MS2M04-A0FNN-KMDH0 from Bosch Rexroth Indramat is an ultra-compact motor featuring an optical encoder with 23-bit resolution and multiturn capability. With a rated power of 0.75 kW and protection type IP65, it is well-suited for demanding automation environments. Its low rotor inertia and natural convection cooling enhance both efficiency and application flexibility.
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