DC servo motor
ElectroCraft RapidPower Plus (RPP) DC servo motor
Higher-power NEMA 23 and 34 brushless motors for supplies up to 325 V, with up to 4 Nm continuous and 16 Nm peak torque (300 % overload) and speeds up to 5,000 rpm.
Key specifications
| Voltage (max) | 325 V |
|---|---|
| Rated torque (max) | 4 Nm |
| Peak torque (max) | 16 Nm |
| Speed (max) | 5,000 rpm |
| NEMA sizes | 23, 34 |
| Overload | up to 300 % peak |
Summarised in our own words from ElectroCraft, Inc.'s published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Specify Motion is not affiliated with ElectroCraft, Inc.. ElectroCraft and RapidPower Plus (RPP) are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Alternatives that meet or exceed these figures
Engineers often come to us with an ElectroCraft part number and leave with an alternative that is easier to source, quicker to deliver or a better fit for the machine. These 3 series from our supply network are the closest match on published figures.
Leadshine low-voltage PMSM servo motors from a 25 mm 33 W unit up to a 130 mm 2 kW unit, wound for 24-60 V DC buses. Fully published data covers torque to 6.4 Nm rated / 16 Nm peak, 17-bit absolute or 2500 ppr incremental encoders and IP65. Designed for ELD2, 2ELD2 and ELD3 drives.
| Published maximum | RapidPower Plus (RPP) | ELVM Series Low-Voltage DC Servo Motors |
|---|---|---|
| Rated torque | 4 Nm | 6.4 Nm meets or exceeds |
| Peak torque | 16 Nm | 16 Nm meets or exceeds |
| Speed | 5,000 rpm | 6,000 rpm meets or exceeds |
| Power | — | 2,000 W |
Kinco's current-generation AC servo motor line, matched to the JD2 and FD5P PRO drives. Small-inertia 40-80 mm frames run at 3000 rpm on 220 V; large-inertia 130 and 180 mm frames are 1500 rpm machines reaching 47.8 Nm rated and 7.5 kW, with 23-bit multi-turn absolute encoders as standard.
| Published maximum | RapidPower Plus (RPP) | SMK Series AC Servo Motors (SMK40S/60S… |
|---|---|---|
| Rated torque | 4 Nm | 47.8 Nm meets or exceeds |
| Peak torque | 16 Nm | 119.5 Nm meets or exceeds |
| Speed | 5,000 rpm | 6,000 rpm meets or exceeds |
| Power | — | 7,500 W |
Brushed permanent-magnet DC servomotors in 82 mm and 102 mm frames with a 9.5 V/krpm tachogenerator on every model. Continuous stall torque runs 0.5-4.5 Nm with peaks to 22 Nm, and the motors work with most brushed servo drives on the market.
| Published maximum | RapidPower Plus (RPP) | BDS Series DC Brushed Servomotors (82B… |
|---|---|---|
| Rated torque | 4 Nm | 4.3 Nm meets or exceeds |
| Peak torque | 16 Nm | 22 Nm meets or exceeds |
| Speed | 5,000 rpm | 5,000 rpm meets or exceeds |
| Power | — | 964 W |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
What a DC servo motor is
A DC servo motor, in current usage, is usually a low-voltage brushless permanent-magnet motor designed to run from a DC bus, typically 24 to 96 V, under closed-loop servo control. Electronically it works like an AC servo, with a three-phase stator commutated by the drive and encoder or Hall feedback on the shaft. The lower voltage means higher current for the same power, but suits battery-powered and safety-extra-low-voltage machines. Small precision brushless servomotors also fall into this group.
When engineers choose a DC servo motor
Choose a low-voltage DC servo for mobile robots, AGVs, battery equipment, medical devices and compact machines where mains voltage is impractical or unsafe. It allows simple power distribution and safe access. The trade-offs are current and power range: high current means thicker cables and higher losses, so power is typically limited to a few kilowatts. For mains-powered machines above that, an AC servo is usually simpler.
How to specify the ElectroCraft RapidPower Plus (RPP)
Send these with your enquiry and an engineer can confirm the right RapidPower Plus (RPP) variant or an equivalent:
- Bus voltage (V DC) and battery range
- Continuous and peak torque (Nm)
- Rated and maximum speed (rpm)
- Continuous and peak current (A)
- Feedback type and resolution
- Brake, IP code and frame size (mm)
- Drive and network interface
Common mistakes to avoid
- Sizing at nominal battery voltage without checking the low-charge end
- Undersizing cables for the higher current
- Ignoring regenerative energy into a battery or supply
- Mixing motor and drive feedback types that are not compatible
ElectroCraft RapidPower Plus (RPP): frequently asked questions
What is the ElectroCraft RapidPower Plus (RPP)?
Higher-power NEMA 23 and 34 brushless motors for supplies up to 325 V, with up to 4 Nm continuous and 16 Nm peak torque (300 % overload) and speeds up to 5,000 rpm. Published series figures include voltage 325 V, rated torque 4 Nm, peak torque 16 Nm, speed 5,000 rpm. It is made by ElectroCraft, Inc.; Specify Motion can help source it or propose an equivalent.
Who makes the ElectroCraft RapidPower Plus (RPP)?
The ElectroCraft RapidPower Plus (RPP) is made by ElectroCraft (ElectroCraft, Inc.) and is listed here for engineers comparing options. Specify Motion is not affiliated with ElectroCraft, Inc.; brand names are used only to identify the product.
What is the voltage of the ElectroCraft RapidPower Plus (RPP)?
The published series maximum voltage is 325 V. Individual models and sizes in the RapidPower Plus (RPP) range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the ElectroCraft RapidPower Plus (RPP)?
Yes. On published figures, Leadshine ELVM Series Low-Voltage DC Servo Motors and Kinco SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G) are the closest match from our supply network. An engineer confirms the fit against your application before recommending anything.
What is the difference between an AC servo and a DC servo motor?
Both are typically brushless permanent-magnet motors under closed-loop control. The main difference is the supply: AC servos are wound for drives fed from mains voltage, while DC servos are wound for low-voltage DC buses. DC servos suit battery and low-voltage machines; AC servos suit higher-power mains machines.
How does battery voltage affect a DC servo motor?
Motor speed is roughly proportional to available voltage, so as a battery discharges the top speed falls. Size the motor at the lowest working battery voltage. Also allow for regenerative energy during braking, which raises bus voltage and must be absorbed by the battery or a braking circuit.
Further reading: How to select a servo motor · How to select a dc motor · Servo and stepper motors
Other dc servo motor series
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