Brushless DC Motors
from ElectroCraft

ElectroCraft BLDC motors stand out for their innovative designs through a combination of advanced engineering and application-focused customization. Our brushless technology delivers exceptionally high torque density in compact packages, quick acceleration, and ultra-smooth motion. ElectroCraft BLDC motors are a preferred choice in robotics, medical devices, lab equipment, industrial automation, military & defense applications, and more

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ElectroCraft Brushless DC Motors (BLDC) are designed for high performance. Rapid Power and Rapid Power Plus BLDC motors have an efficient, compact design, with high torque density defined by high torque relative to frame size. Please view our base product families, and don’t hesitate to contact our BLDC application engineers for questions regarding your BLDC motor needs. ElectroCraft specializes in developing custom solution for the most demanding motion control projects. In addition to our BLDC product line up, please visit our Handbook and Application Guide for High Performance Brushless Motors. ◂ less
Highly Efficient and Durable
Superior power-to-weight ratios and efficiency without compromising durability or precision.
Premium materials
High-energy neodymium magnets, precision bearing systems, and robust hall-effect feedback ensure reliable performance across extreme environments.
Customizable
ElectroCraft BLDC motors can be customized to meet exact OEM requirements. Shaft dimensions and features, winding voltages, performance characteristics, feedback devices, mounting methods, protection ratings, and more can be custom tailored for the application.

RPX Brushless DC Servo Motors

Peak Torque 16 to 3,151 mNm (2 to 446 oz-in)
The ElectroCraft RapidPower™ Xtreme (RPX) series is a family of compact, lightweight, high-performance motors with class-leading peak and continuous torque ratings. High pole counts per frame size with high-energy neodymium magnets and encapsulated cores provide the highest torque density possible while delivering optimal thermal characteristics and energy efficiency. Built-in hall sensors for commutation and optional encoder feedback allow for precise control of motor speed and position. The RPX is Ideal for embedded applications. more ▸
The RPX series stands out by enabling equipment downsizing with up to 25% higher efficiency and nearly 40% smaller footprints compared to conventional BLDC designs, translating to significant cost savings, reduced heat generation, and enhanced reliability in demanding environments. Its high torque density and modular, fully customizable design— including integrated hall sensors, optional encoders, and compatibility with advanced drives—accelerates time-to-market and supports diverse applications from surgical robots to precision pumps. Overall, the RPX delivers superior power-to-weight ratios, energy efficiency, and durability, providing engineers with a versatile solution that boosts performance without compromising on compactness or budget. ◂ less
Frame Size
Peak Torque

RPX16 16.25 mm Brushless DC Motors

Frame Size 16.25 mm (0.640 in)
Peak Torque 35 mNm (5 oz-in)

RPX22 22 mm Brushless DC Motors

Frame Size 22 mm (0.866 in)
Peak Torque 93 mNm (13 oz-in)

RPX32 32 mm Brushless DC Motors

Frame Size 32 mm (1.260 in)
Peak Torque 437 mNm (62 oz-in)

RPX40 40 mm Brushless DC Motors

Frame Size 40 mm (1.575 in)
Peak Torque 989 mNm (140 oz-in)

RPX52 52 mm Brushless DC Motors

Frame Size 52 mm (2.047 in)
Peak Torque 3,151 mNm (446 oz-in)

LRPX BLDC Planetary Gearmotors

Peak Torque 0.0 to 22.5 Nm (5 to 3,186 oz-in)
The ElectroCraft LRPX series is a family of compact, high-performance brushless DC (BLDC) gearmotors that integrate the innovative RPX series motor with a custom planetary gearbox, delivering exceptional torque at low speeds in a sleek, efficient package. The LRPX enables equipment downsizing with higher efficiency and smaller footprints, translating to significant cost savings, reduced heat generation, and enhanced reliability more ▸
The LRPX series high torque density and low-RPM optimization minimize cogging and vibration for ultra-smooth motion, while the modular, fully customizable design— including integrated gearheads and compatibility with advanced drives—accelerates time-to-market and supports diverse applications from mobile robots to precision pumps. Overall, the LRPX delivers superior power-to-weight ratios, energy efficiency, and durability, providing engineers with a versatile solution that boosts performance without compromising on compactness or budget ◂ less
Frame Size
Peak Torque

LRPX16 16.25 mm Brushless DC Motors

Frame Size 16.25 mm (0.640 in)
Peak Torque 0.9 Nm (135 oz-in)

LRPX22 22 mm Brushless DC Motors

Frame Size 22 mm (0.866 in)
Peak Torque 3.0 Nm (425 oz-in)

LRPX32 32 mm Brushless DC Motors

Frame Size 32 mm (1.260 in)
Peak Torque 8.0 Nm (1,133 oz-in)

LRPX40 40 mm Brushless DC Motors

Frame Size 40 mm (1.575 in)
Peak Torque 22.5 Nm (3,186 oz-in)

RP Brushless DC Motors

Peak Torque 22 to 1,095 oz-in (16 to 773 Ncm)
The ElectroCraft RapidPower™ (RP) series is a family of high-performance, 4-pole brushless DC motors engineered to deliver exceptional performance, efficiency, and smoothness in a compact, cost-effective package. Available in NEMA 17, 23, and 34 frame sizes with a wide range of voltage options from 12 to 160 VDC, the RP series utilizes high-energy neodymium magnets and precision winding techniques to achieve continuous torque ratings from 0.1 to 2.1 Nm and peak torque far exceeding conventional motors of comparable size. Standard features include integrated hall-sensor feedback (with optional commutating encoders), ultra-low cogging for quiet and precise motion, and peak efficiencies above 85%-90% for reduced energy consumption. more ▸
The RapidPower™ RP series sets a new standard for affordable high-performance BLDC motion by offering specifications and build quality that rival premium motors costing much more. This unmatched price-to-performance ratio makes it the ideal choice for cost-conscious, high-volume applications—including medical devices, lab automation, robotics, and industrial systems—where engineers can now specify near-premium power, reliability, and precision without exceeding budget constraints. In short, the RP series delivers true high-end performance at a distinctly accessible price point. ◂ less
Frame Size
Peak Torque

RP17 NEMA 17 Brushless DC Motors

Frame Size NEMA 17
Peak Torque 136 oz-in (96 Ncm)

RP23 NEMA 23 Brushless DC Motors

Frame Size NEMA 23
Peak Torque 190 oz-in (134 Ncm)

RP34 NEMA 34 Brushless DC Motors

Frame Size NEMA 34
Peak Torque 1,095 oz-in (773 Ncm)

RPP Brushless DC Motors

Peak Torque 180 to 2,272 oz-in (127 to 1,604 Ncm)
The ElectroCraft RapidPower™ Plus (RPP) series is a premium line of high-performance brushless DC servo motors engineered for demanding applications requiring exceptional precision, rapid acceleration, and sustained high torque. Available in NEMA 23 (RPP23) and NEMA 34 (RPP34) frame sizes, these motors feature advanced electro-magnetic designs with high-energy neodymium magnets, skewed magnetization for minimal cogging, and low-inertia rotors that enable continuous torques up to 568 oz-in (4 Nm) and peak torques reaching 2272 oz-in (16 Nm). Supporting high-voltage DC configurations (up to 325V) and speeds reaching 5000 RPM, the RPP series integrates standard differential optical encoders for sub-micron positioning accuracy, hall-effect commutation, and robust TENV enclosures with optional IP65 sealing via O-rings and shaft seals. Customizable options include integral brakes, metric/imperial mounts, and connector types, making them versatile for industrial housed configurations in automation, CNC machinery, medical robotics, and high-precision actuators. more ▸
As a premium high-precision servo motor family, the RPP series excels by delivering unmatched torque density and dynamic response in compact, rugged packages that outperform standard BLDC motors in accuracy and reliability without the bulk of oversized alternatives. Its low-cogging design ensures ultra-smooth, vibration-free operation for pinpoint control in servo applications, while high continuous torque and rapid acceleration capabilities support peak overloads up to 300% for handling transient demands efficiently. Compared to competitors, the RPP provides superior power-to-size ratios and environmental durability at a competitive price point, reducing system complexity, heat dissipation, and maintenance costs. Engineers benefit from ElectroCraft’s customization expertise, accelerating integration and enabling breakthrough performance in mission-critical systems where precision and endurance define success. ◂ less
Frame Size
Peak Torque

RPP23 NEMA 23 Brushless DC Motors

Frame Size NEMA 23
Peak Torque 400 oz-in (282 Ncm)

RPP34 NEMA 34 Brushless DC Motors

Frame Size NEMA 34
Peak Torque 2,272 oz-in (1,604 Ncm)

What are BLDC motors?

Brushless DC motors, also called BLDC motors, use electronic commutation. A 3-phase inverter drives the coils with electronic commutation. A controller times each phase switch using rotor position feedback. Brushless DC motors give tight speed control and high torque density. You remove brushes, so a DC motor avoids brush wear.

A brushless motor uses Hall sensors or an encoder for commutation timing. That feedback reduces torque ripple during starts and load changes. You pair the motor with a matched drive to match the motor's voltage and current. Engineers use them in robotics, pumps, fans, and automation systems. These motors are ideal for compact machines that require repeatable motion.

How to choose a brushless DC motor

Start with the job your brushless DC motor must do in the machine.

Define the load type, like a pump, fan, actuator, or rotary stage. Set speed range, accel time, stop accuracy, frame size, and supply voltage.

  • BLDC motor target speed range and max speed.
  • Load points marked on the speed torque curve.
  • Continuous torque is required during the duty cycle.
  • Peak torque required during acceleration events.
  • RMS torque target for heat and sizing.
  • DC bus voltage limit from your power source.
  • Supply current limit during the worst-case load.
  • Inertia and reflected inertia at the motor shaft.
  • Radial load and axial load at bearings.
  • Ambient temperature near the motor mounting.

Compare your load points against the speed torque curve early. Continuous torque drives temperature rise more than peak torque in a DC motor.

Choose the 3-phase drive and inverter early in design.

Select Hall sensor or encoder feedback for rotor position timing. That brushless motor choice shapes commutation, FOC behavior, low-speed smoothness, and torque ripple.

  • Control loop type: speed, position, torque.
  • Feedback format matches drive input limits.
  • The startup method supports sensorless or sensor-controlled.
  • Flange pattern matches housing and bolt circle.
  • Shaft diameter and keyway match coupling hardware.
  • Bearing life supports radial load over the duty cycle.
  • Continuous current and peak current match drive ratings.
  • Connector style and cable exit match enclosure routing.
  • Sealing level matches dust, oil mist, and washdown.
  • IP rating target matches ingress risk at the site.

Confirm voltage match, current headroom, and cable routing before final selection. Then compare frame size, gearbox needs, and load limits across RPX, LRPX, RP, and RPP.

Pick an ElectroCraft motor family.

Begin with space limits, speed range, and torque requirements for your machine. ElectroCraft BLDC motors are split into RPX, LRPX, RP, and RPP families. Each family differs in frame size, peak torque range, mounting, and feedback.

RPX

  • Compact metric frames for direct drive packages
  • High torque per frame size
  • Hall sensor or encoder feedback options

LRPX

  • RPX plus planetary gearhead for low-speed torque.
  • Gear ratio cuts speed and raises torque
  • High torque per frame size
  • Hall sensor or encoder feedback options

RP

  • NEMA 17, 23, 34 frames for standard mounting faces.
  • Common shafts and brackets fit more easily.
  • Hall sensor or encoder feedback options

RPP

  • NEMA frames with higher peak torque options.
  • Common shafts and brackets fit more easily.
  • Hall sensor or encoder feedback options

Use RPX when you need direct coupling in a tight space. Use LRPX when the gearing supports low-speed torque at the load. Brushless DC motors need a drive match, so check voltage and current.

Use RP when you want NEMA mounting and common motor footprints. Use RPP when you need higher torque and sealing options, including IP rating targets. Next, compare frame size, peak torque, and feedback on each family page.

Motor and Drive Compatibility

A drive powers brushless DC motors through controlled 3-phase switching. A mismatch can cap speed, raise temperature, or trigger drive faults. Start with the motor family, series, and part number.

Match the supply voltage to the motor rating and the DC bus range. Check the continuous current, peak current, and current limit to ensure BLDC motors meet the torque requirement.

  • Motor family, series, and part number.
  • Rated voltage and DC bus voltage range.
  • Continuous current, peak current, and current limit.
  • Hall sensor or encoder feedback support.
  • Commutation mode and FOC support.
  • Connector type, pinout, and polarity checks.
  • Cable exit direction, routing, shielding notes.
  • Grounding plan and EMI checks.

Confirm rotor position feedback fits speed or position control. Use the compatibility chart, then verify the pinout before wiring.

FAQs

BLDC motors use electronic commutation through a drive. Brushed DC motors use brushes and a commutator for switching. Brush wear can create dust and service downtime. A drive controls phase timing for smoother speed control.

Brushless DC motors require a drive to commutate 3 phases. The drive controls speed, torque, and position using voltage and current limits. Match DC bus voltage, continuous current, and peak current, then confirm the pairing on the Motor and Drive Compatibility chart.

Hall sensors report rotor position for commutation and basic speed control. They fit a simple start-and-run control. An encoder provides higher-resolution feedback for position control. It also improves low-speed smoothness when you tune the speed loop.

Use a gearbox when the load demands low speed and higher output torque. A gear ratio lets the motor spin faster while the output turns slower. Check reflected inertia, shaft load, and bearing limits, then consider LRPX planetary gearmotor options.

Collect speed range and load torque points for the full motion cycle. Add peak torque, continuous torque, duty cycle, and RMS torque targets. Compare those points on a speed torque curve. Confirm supply voltage, supply current, radial load, axial load, and ambient temperature.

Voltage options depend on the winding voltage and the motor's series. RPX supports 12 V, 24 V, and 48 V windings. Match the drive voltage range to the motor rating, then confirm the exact voltage on the series datasheet.

Embedded equipment prioritizes compact frame size and clean mounting. RPX uses metric frames that fit tight product envelopes. Choose direct drive when the load speed fits the motor speed range. Choose LRPX when a planetary gearmotor meets low-speed torque targets.

ElectroCraft offers customization for shaft features and mounting methods. You can select winding voltage to match your power system. You can choose Hall sensor or encoder feedback devices. You can also specify protection ratings and IP rating targets for the enclosure.

Use the Motor and Drive Compatibility page to find compatible drives. Start with the motor series and part number, then check drive models. Confirm voltage range, continuous current, peak current, and feedback match. Verify connector pinout, polarity, grounding, and shielding before wiring.