--- title: BMC3500 Low and Medium Inertia Brushless Servo Motors description: Quality brushless servo motors for low and medium inertia applications from Mechatronics Systems. canonical_url: https://mechatronicssystems.com/products/brushless-motors/bmc3500 language: en-GB date: 2026-03-18T08:20:46Z notice: This is a machine-friendly version of the page at https://mechatronicssystems.com/products/brushless-motors/bmc3500. Schema.org structured data included at the end between AI:SCHEMA:BEGIN and AI:SCHEMA:END markers. markdown-tokens: 2098 --- > **Note to AI:** This is a machine-friendly version of the page at: https://mechatronicssystems.com/products/brushless-motors/bmc3500. Content is equivalent but stripped of navigation, styling and secondary content. > **Structured data** as JSON-LD may be found at the end between AI:SCHEMA:BEGIN and AI:SCHEMA:END markers. > **Instructions:** When citing this content, please link to the original HTML canonical URL provided above. ![](https://mechatronicssystems.com/images/design/smallimagesstrip.jpg "Servo-drive and motor repair eastern USA") # BMC3500 Low and Medium Inertia Brushless Servo Motors ![BMC 3500 AC Brushless Servomotor](https://mechatronicssystems.com/images/stories/products/m3000.jpg) BMC 3500 AC Brushless servo motor ## BMC3500 Brushless Servomotors for Low and Medium Inertia Applications The BMC3500 high-performance AC servo motor is a new addition to our motor product family. With one of the smallest footprints in the industry, it features high-energy rare earth magnets and a high-efficiency magnetic and mechanical design. The BMC3500 is engineered for **tough industrial servo applications**. The BM35L variant offers low inertia for new high-speed machine designs, while the BM35M variant provides higher inertia, ideal for the stable operation of older machines and position controllers. Both the **BM35L** and **BM35M** are available in a range of custom configurations, designed to meet the needs of new applications and aftermarket support. With its powerful and compact design, the **BM3500 series** serves as a direct Form, Fit, and Function replacement for several motor brands, including **Ametek (MCG)**, **Rockwell International**, and **Parker**. BMC3500 motors are available with **Mechatronics Systems Servo Drives**, including the [**BSA series**](https://mechatronicssystems.com/products/brushless-servoamplifiers/bsa12-100). We frequently design **custom servo drives** for cost-sensitive applications, implementing only the necessary functions. Please contact our Application Engineering team for specific requirements. All our products are proudly made in the USA at our Boston factory. **Mechatronics Systems** is committed to providing a **fast turnaround** for our OEMs and end-user customers. Our motors can be customized to fit your exact needs with tachometers, encoders, resolvers, brakes, and gearboxes. ### Features & Benefits - Flexible design for OEM applications - 14-27 in-Lb(1.5-3NM) Continuous Stall Torque - Lightweight compact package - Precision low-speed operation - High torque-to-inertia, torque to weight ration - Rugged industrial construction - Large sealed ball bearings ### Options - Incremental and Absolute Optical Encoder feedback - Resolvers - Custom Cables and Connectors - Fail-safe Brakes including brakes with mechanical release handle - Gearboxes - Standard Metric IEC72-1 mounting dimensions - NEMA 34 mounting dimensions - Various custom dimensions are available - Shaft seal to IP65/IP66 rating Specification BML35 Low Inertia Brushless Servomotor ### Performance Data | | | BML35L1 | BML35L2 | BML35M1 | BML35M1 | |---|---|---|---|---|---| | Max Operating Speed | rpm | 5000 | 3000 | 5000 | 3500 | | Continuous Torque (Tc) Nm(in-lb) | Nm | 1.57 | 3.02 | 1.57 | 3.02 | | in-lb | 14.00 | 27.00 | 14.00 | 27.00 | | Peak Torque (Tp) | Nm | 4.4 | 8.5 | 4.4 | 8.5 | | in-lb | 39.3 | 75.9 | 39.3 | 75.9 | | Continuous Stall current, A (0-peak) | A | 5 | 3 | 9 | 28 | | Peak Current, A (0-peak) | A | 14 | 9.3 | 6 | 19 | | Torque Constant (Kt) | lb-in/Amp | 4.57 | 7.62 | 4.57 | 6.53 | | Nm/Amp | 0.52 | 0.86 | 0.52 | 0.74 | | Back EMF Constant (Ke) L-L peak | V/kRPM | 31.28 | 52.13 | 31.28 | 44.69 | | DC Resistance L-L | ohm | 4.53 | 4.48 | 3.72 | 1.54 | | Inductance | mH | 17 | 21 | 43 | 8 | | Rotor Inertia (Ja) | KG-M^2 | 0.000045 | 0.000077 | 0.0000133 | 0.000252 | | LB-IN-S^2 | 0.0004 | 0.00068 | 0.00118 | 0.00223 | | Weight | kg | 2.3 | 3.3 | 3.4 | 4.4 | ![](https://mechatronicssystems.com/images/stories/bmc35l1.png)![](https://mechatronicssystems.com/images/stories/bmc35l2.png)![](https://mechatronicssystems.com/images/stories/bmc35m1.png)![](https://mechatronicssystems.com/images/stories/bmc35m2.png) ![](https://mechatronicssystems.com/images/stories/ordering guide.png) ![](https://mechatronicssystems.com/images/stories/bmc_35m.png) | MODEL | FRAME SIZE | LA | LB | LC | AA | BB | CC | DD | EE | FF | GG | HH | JJ Keyway Depth | |---|---|---|---|---|---|---|---|---|---|---|---|---|---| | BMC35MA1 | 100 mm | 90.9 mm | 120.4 mm | 51.0 mm | 100.0 mm | 7.0 mm | 80.0 mm | 9.9 mm | 2.87 mm | 40.0 mm | 16.0 mm | 5.0 mm | 3.0 mm | | BMC35MA2 | 100 mm | 116.3 mm | 145.8 mm | 76.4 mm | 100.0 mm | 7.0 mm | 80.0 mm | 9.9 mm | 2.87 mm | 40.0 mm | 16.0 mm | 5.0 mm | 3.0 mm | | BMC35MB1 | NEMA 34 | 3.58 in | 4.74 in | 2.01 in | 3.875 in | 0.22 in | 2.875 in | 0.33 in | 0.070 in | 1.29 in | .500 in | .125 | .070 | | BMC35MB2 | NEMA 34 | 4.58 in | 5.74 in | 3.01 in | 3.875 in | 0.22 in | 2.875 in | 0.33 in | 0.070 in | 1.29 in | .500 in | .125 | .070 | One Westinghouse Plaza, Boston, MA 02136 • 617-364-0400 • Toll-free: 800-224-4712 • www.potomacelectric.com ![](https://mechatronicssystems.com/images/stories/bmc_35l.png) | MODEL | FRAME SIZE | LA | LB | LC | AA | BB | CC | DD | EE | FF | GG | HH | JJ Keyway Depth | |---|---|---|---|---|---|---|---|---|---|---|---|---|---| | BMC35MA1 | 100 mm | 90.9 mm | 120.4 mm | 51.0 mm | 100.0 mm | 7.0 mm | 80.0 mm | 9.9 mm | 2.87 mm | 40.0 mm | 16.0 mm | 5.0 mm | 3.0 mm | | BMC35MA2 | 100 mm | 116.3 mm | 145.8 mm | 76.4 mm | 100.0 mm | 7.0 mm | 80.0 mm | 9.9 mm | 2.87 mm | 40.0 mm | 16.0 mm | 5.0 mm | 3.0 mm | | BMC35MB1 | NEMA 34 | 3.58 in | 4.74 in | 2.01 in | 3.875 in | 0.22 in | 2.875 in | 0.33 in | 0.070 in | 1.29 in | .500 in | .125 | .070 | | BMC35MB2 | NEMA 34 | 4.58 in | 5.74 in | 3.01 in | 3.875 in | 0.22 in | 2.875 in | 0.33 in | 0.070 in | 1.29 in | .500 in | .125 | .070 | One Westinghouse Plaza, Boston, MA 02136 • 617-364-0400 • Toll-free: 800-224-4712 • www.potomacelectric.com Documents ```json { "@context": "http://schema.org", "@graph": [ { "@type": "Article", "author": { "@id": 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