RPX40 Brushless DC Motor
RapidPower™ Xtreme Series

Summary Details

Size: 40 mm (1.575 in)
Peak Torque: to 991 mNm (140 oz.in)

High torque density. Excellent torque per frame size performance.

New from ElectroCraft, the RPX40 is a highly dynamic and controllable very small frame metric motor. With an advanced 14-pole encapsulated core, this compact DC motor offers high torque density at a very affordable price. The RPX40 is available in 12V, 24V and 48V versions and like all ElectroCraft motors is fully customizable. This versatile motor is highly energy efficient and ideal for embedded applications.

All versions of the RPX40 include hall sensor feedback and can be configured with an optional encoder (differential, optical encoder with up to 2048 lines).

Additional Product Details

RPX40 Outline Drawing

Technical Drawings

RPX40 Performance Curves

Chart Chart Chart Chart: RPX Series Stall Torque at elevated Ambient Temperatures

RPX40 Mechanical / Winding Data

RPX40 Stack Size and Winding Models
Specifications RPX40-125V12 RPX40-125V24 RPX40-125V48 RPX40-250V12 RPX40-250V24 RPX40-250V48 RPX40-325V12 RPX40-325V24 RPX40-325V48
Design Voltage (VDC) 12 24 48 12 24 48 12 24 48
No load speed (RPM) 6,000 5,000 3,600
Peak Torque (oz-in) 56.4 108.1 140.0
Peak Torque (mNm) 398.0 765.0 991.0
Peak Current (Amps) 19.7 9.8 4.9 32.8 16.4 8.2 31.0 15.5 7.7
Continuous Stall Torque* (oz-in) 17.7 35.4 46.0
Continuous Stall Torque* (mNm) 125.0 250.0 325.0
Continuous Stall Current (Amps) 6.6 3.3 1.6 10.9 5.5 2.7 10.2 5.1 2.6
Continuous Rated Torque* (oz-in) 15.3 22.0 38.2
Continuous Rated Torque* (mNm) 108.0 155.0 270.0
Continuous Rated Current (Amps) 5.7 2.8 1.4 6.8 3.4 1.7 8.5 4.2 2.1
Continuous Rated Speed (RPM) 4,775 4,075 2,950
Voltage Constant (V / kRPM) 2.0 4.0 8.0 2.4 4.8 9.6 3.3 6.7 13.3
Torque Constant (oz-in / Amp) 2.7 5.4 10.8 3.2 6.5 13.0 4.5 9.0 18.0
Torque Constant (mNm / Amp) 19.1 38.1 76.3 22.9 45.8 91.5 31.8 63.6 127.1
Resistance (Ohms) 0.4 1.5 5.8 0.2 0.7 2.6 0.2 0.7 2.7
Inductance (mH) 42.5 170.0 680.2 27.8 125.4 501.4 31.2 124.9 499.7
Motor Constant (oz-in / √ Watt) 4.5 7.7 9.8
Motor Constant (mNm / √ Watt) 31.6 54.2 69.2
Electrical Constant (msec) 0.33 0.40 0.45
Mechanical Constant (msec) 1.11 0.51 0.19
Thermal Time Constant (sec) 430.0 455.0 480.0
Rotor inertia (oz-in²) 0.0383 0.0820 0.1640
Rotor inertia (g-cm²) 7.0 15.0 30.0
Thermal Resistance (C / Watt) 4.77 4.02 3.69
Axial Load (N) 5mm from face 7.0 7.0 7.0
Radial Load (N) 5mm from face 30.0 30.0 30.0
Weight (oz) 5.6 8.5 13.1
Weight (g) 160.00 240.00 370.00
Length (inch) 1.2 1.6 2.4
Length (mm) 30.0 40.0 60.0
Number of Poles 14.0 14.0 14.0
Notes:  *Continuous rating based on a 25°C ambient temperature, winding temperature rise of 125°C. Mounted on a 150 X 150 X 6 mm aluminum heat sink.

RPX40 Connection

hall diagram

RPX40 CAD

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ElectroCraft Rapid Delivery Program

Some versions of this product are available via ElectroCraft's Rapid Delivery Program. Lead times for these products are given in working days and stated below. Please note, these lead times may be exceeded during holiday periods or due to unforeseen circumstances. Always contact your local ElectroCraft representative for confirmation of availability.

Rapid delivery products are stocked in locations all over the World. If the product you require is not stocked in your region, you may request accelerated delivery from other areas. Please consult your local representative for more information.

Customers are responsible for all freight charges.

Rapid Delivery to:

Select the region where the product would be delivered to.

The Americas

Part Number Description Typical Lead Time
RPX40-125V24-100-S 2 days
RPX40-250V24-100-S 2 days
RPX40-325V24-100-S 2 days

Europe, the Middle East and Africa

Part Number Description Typical Lead Time
No products available

Asia

Part Number Description Typical Lead Time
RPX40-125V24-100-S 2 days
RPX40-250V24-100-S 2 days
RPX40-325V24-100-S 2 days