BAUMÜLLER BM4432-SI1-010 00-01

Digital guide

BAUMÜLLER BM4432-SI1-010 00-01

Model Series: BM44 Series — Medium-Frame Synchronous Servo Motor

Product Introduction:
The BM4432-SI1-010 00-01 is a medium-frame Baumüller synchronous servo motor equipped with a smooth shaft, natural convection cooling, and a single-turn absolute encoder. It is designed for applications requiring precise positioning within one revolution with fast power-on readiness.

WhatApp

WeChat

Detailed content

Type Designation Breakdown:

BM44 — BM44 Series Servo Motor
32 — Frame Size 32 (outer diameter 160 mm)
S — Synchronous Servo Motor
I — Smooth Shaft (No Keyway), Natural Convection Cooling
1 — Single-Turn Absolute Encoder
010 — Winding/Configuration Code
00-01 — Version/Revision Code

Technical Specifications:

Parameter	Value
Frame Size	32
Stator Outer Diameter	160 mm
Cooling Method	IC 411 — Natural Convection (Self-Cooled)
Shaft Type	Smooth Shaft (Without Keyway)
Encoder Type	Single-Turn Absolute Encoder (EnDat 2.1)
Encoder Resolution	128 periods/rev (14-bit single-turn)
Rated Torque (M0)	0.8 Nm
Maximum Torque (Mmax)	2.4 Nm
Rated Speed (nN)	3000 rpm
Maximum Speed (nmax)	5000 rpm
Rated Power (PN)	0.25 kW (continuous)
Peak Power	0.75 kW
Rated Voltage (UN)	400 V AC (three-phase)
Rated Current (IN)	0.75 A
Phase Resistance (R)	3.6 Ω (20°C)
Phase Inductance (L)	7.8 mH
Moment of Inertia (Jm)	0.00030 kg·m² (300 g·cm²)
Protection Class	IP65 (with connector)
Insulation Class	F (155°C)
Ambient Temperature Range	-10°C to +40°C
Weight	Approximately 3.8 kg
Connector Type	M23 x 12-pin (power + encoder)

Functional Features:

Single-turn absolute encoder delivers absolute position within 0° to 360° immediately at power-on
Smooth shaft compatible with clamping hub couplings for zero-backlash torque transmission
Natural convection cooling — zero maintenance, silent operation
High speed capability up to 5000 rpm with constant torque region
Optimized for Baumüller b maXX 5000 / 3000 servo drive systems

Structural Characteristics:

Housing: Aluminum die-cast, corrosion-resistant anodized finish
Stator: Laminated silicon steel, 0.35 mm thickness, epoxy-coated for moisture resistance
Rotor: Surface-mounted NdFeB magnets, 4-pole configuration
Bearings: Sealed precision ball bearings, L10 life ≥ 25,000 hours at rated load
Shaft: C45 hardened steel, Ø28 mm, Ra 0.4 µm surface finish, smooth (no keyway)

Working Principle:
Three-phase AC currents from the servo amplifier generate a rotating magnetic field in the stator. The NdFeB permanent magnet rotor locks to this field and rotates at synchronous speed. The single-turn absolute encoder provides 14-bit absolute angular position (16,384 counts per revolution) within one turn. The servo drive uses this feedback for closed-loop position control with typical servo bandwidth exceeding 1 kHz.

Advantages & Highlights:

Single-turn absolute — instant position knowledge at power-on, no reference run needed
Smooth shaft — higher torque capacity than keyed shafts, no stress risers
Compact medium-frame size — balances torque and footprint
High efficiency (>90%) at rated operating point
Low cogging torque (<0.5% of rated torque) for smooth low-speed operation

Applicable Industries: