Schneider Electric BMH Series Servo Motors

Technical Dossier

Product Details And Specifications

Schneider Electric BMH Series: Comprehensive Module Range and Technical Overview

The Schneider Electric BMH series represents a family of brushless AC servo motors engineered for high-dynamic motion control applications across heavy industry. Deployed extensively in chemical processing plants, oil refineries, nuclear facility auxiliary systems, and continuous-process manufacturing lines, the BMH series is the standard rotary actuator paired with the Lexium 32 and Lexium 62 servo drive platforms. Its global installed base spans hundreds of thousands of units across Europe, Asia-Pacific, and the Americas, making long-term spare parts availability a critical operational concern for plant maintenance engineers.

The BMH1002P22A2A is a mid-range unit within this family: 1.0 Nm peak torque, 3000 rpm rated speed, 230 V AC supply compatibility, IP54 environmental protection, and a resolver feedback interface — a configuration widely specified in packaging, material handling, and precision assembly lines.

The Evolution of BMH Series Architecture

The BMH series was introduced as part of Schneider Electric's Lexium motion control ecosystem in the early 2000s, succeeding the earlier Unimotor and SER/SEM motor families. The initial architecture used resolver-based feedback, which provided robust analog position sensing suitable for harsh industrial environments. As the platform matured, Schneider introduced SinCos encoder variants and later multi-turn absolute encoder options, enabling higher positioning accuracy without external homing cycles.

The BMH series is mechanically defined by its IEC-standard flange dimensions (B5 and B14 mounting), smooth cylindrical housing for IP54/IP65 sealing, and a keyed shaft with optional holding brake. Electrically, the series spans supply voltages from 115 V AC single-phase to 480 V AC three-phase, with continuous torque ratings from 0.5 Nm to over 60 Nm across the full catalog.

Compatibility note: BMH motors are designed for direct pairing with Lexium 32 (LXM32) and Lexium 62 (LXM62) drives. Earlier Lexium 05 and Lexium 15 drives used the BSH motor series; BMH and BSH are not interchangeable without drive parameter reconfiguration and cable adaptation. Engineers migrating from BSH to BMH must verify drive firmware version and motor database file (MDB) compatibility before substitution.

BMH Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Schneider Electric BMH servo motor series, organized by frame size and torque class:

Frame Size 070 — Low Torque (0.5–1.5 Nm)

• BMH0701P01A2A: 0.5 Nm, 3000 rpm, resolver, no brake, IP54, 115/230 V
• BMH0701P01F2A: 0.5 Nm, 3000 rpm, SinCos encoder, no brake, IP54
• BMH0702P22A2A: 0.9 Nm, 3000 rpm, resolver, no brake, IP54, 230 V
• BMH0703P22A2A: 1.4 Nm, 3000 rpm, resolver, no brake, IP54, 230 V
• BMH0703P22F2A: 1.4 Nm, 3000 rpm, SinCos encoder, no brake, IP54

Frame Size 100 — Medium Torque (1.0–4.0 Nm)

• BMH1001P01A2A: 1.0 Nm, 3000 rpm, resolver, no brake, IP54, 115/230 V
• BMH1002P22A2A: 1.0 Nm peak / 2.0 Nm stall, 3000 rpm, resolver, no brake, IP54, 230 V — current page SKU
• BMH1003P22A2A: 3.0 Nm, 3000 rpm, resolver, no brake, IP54, 230 V
• BMH1003P22F2A: 3.0 Nm, 3000 rpm, SinCos encoder, no brake, IP54
• BMH1004P22A2A: 4.0 Nm, 3000 rpm, resolver, no brake, IP54, 230 V
• BMH1004P22A2B: 4.0 Nm, 3000 rpm, resolver, with holding brake, IP54, 230 V

Frame Size 140 — High Torque (5.0–18.0 Nm)

• BMH1401P22A2A: 5.0 Nm, 3000 rpm, resolver, no brake, IP54, 230/400 V
• BMH1402P22A2A: 8.5 Nm, 3000 rpm, resolver, no brake, IP54, 400 V
• BMH1403P22A2A: 12.0 Nm, 3000 rpm, resolver, no brake, IP54, 400 V
• BMH1404P22A2A: 18.0 Nm, 3000 rpm, resolver, no brake, IP54, 400 V
• BMH1404P22A2B: 18.0 Nm, 3000 rpm, resolver, with holding brake, IP54, 400 V

Frame Size 190 — Very High Torque (20.0–60.0 Nm)

• BMH1901P22A2A: 20.0 Nm, 2000 rpm, resolver, no brake, IP54, 400 V
• BMH1902P22A2A: 35.0 Nm, 2000 rpm, resolver, no brake, IP54, 400 V
• BMH1903P22A2A: 60.0 Nm, 1500 rpm, resolver, no brake, IP54, 400 V

Sourcing Hard-to-Find & Obsolete BMH Series Parts

The BMH series entered its mature lifecycle phase in the mid-2010s. Schneider Electric has progressively migrated new machine designs toward the BSH and MH3 motor families, which are paired with the Lexium 62 and Lexium 28 drive platforms. As a result, a growing subset of BMH frame size 070 and 100 resolver-feedback variants have been discontinued from standard production, with lead times on factory-new units extending to 20–40 weeks or becoming indefinite.

DriveKNMS maintains a dedicated inventory of BMH series motors sourced through authorized surplus channels, OEM decommissioning programs, and controlled factory stock. All units are stored in climate-controlled facilities and cataloged by part number, date code, and feedback type. For discontinued resolver variants such as the BMH0701P01A2A and BMH1001P01A2A, DriveKNMS provides tested surplus stock as a direct lifecycle extension solution, eliminating the need for drive reconfiguration or mechanical redesign that a cross-series substitution would require.

Customers operating legacy Lexium 32 installations with BMH motors are advised to establish a strategic spare parts buffer. DriveKNMS can assist with minimum order quantity planning, consignment stock agreements, and multi-year supply contracts for critical BMH variants.

Quality Control for the BMH Series Range

Each BMH motor processed through DriveKNMS undergoes a structured inspection and functional test protocol before dispatch:

• Visual and mechanical inspection: Housing integrity, shaft runout measurement (tolerance: ≤0.02 mm TIR), keyway condition, connector pin inspection, and IP seal verification.
• Winding resistance and insulation test: Phase-to-phase resistance balance (≤2% deviation), insulation resistance to ground (≥100 MΩ at 500 V DC megger test).
• Resolver/encoder verification: Resolver excitation signal injection and output amplitude/phase verification using a dedicated servo analyzer. SinCos encoder variants are tested for signal integrity and interpolation accuracy.
• Holding brake test (where applicable): Brake engagement torque verification against OEM specification (typically 120–150% of motor rated torque).
• Dynamic run test: Motor is coupled to a matched Lexium 32 drive, run through a defined speed/torque profile, and monitored for bearing noise, thermal rise, and commutation stability.
• Documentation: Each unit ships with a test report, inspection checklist, and traceability record including source, date code, and test engineer ID.