10A BLDC Servo Drive Calculator
Estimate DC-bus current, then verify the drive's ratings and thermal limits in its datasheet.
Screening result
Use this estimate to prepare a datasheet check, not as a final compatibility verdict.
Enter motor power and calculate to see an estimate. If an input changes, calculate again to refresh the result.
Model: estimated DC-bus current = motor output power ÷ (bus voltage × assumed 90% combined efficiency). The overload estimate scales this value linearly. Current references are screening assumptions; a winding RMS current rating, peak duration, thermal limit, and regenerative behavior require the specific manufacturer datasheet and application conditions.
What the estimate means
It estimates supply-side demand from motor output power. It does not convert that value into phase current or predict a specific drive’s thermal response.
Input
Rated motor output power
Watts (W)
Estimate
P / (V × efficiency)
Efficiency is assumed to be 90% for this screen.
Next check
Compare like-for-like current
Confirm bus or winding RMS basis in the drive datasheet.
The overload estimate multiplies the continuous bus-current estimate by the selected factor. It does not model transient torque, duration, repetition rate, I²t protection, or regenerative operation.
Verify these ratings before choosing a drive
A “10 A” label is not enough to determine fit. Use the selected product’s revision-controlled datasheet and compare each quantity under the intended conditions.
| Selection dimension | What to verify | Why it matters |
|---|---|---|
| What does the 10 A rating measure? | DC input current or motor phase/winding current (RMS)? | The tool estimates DC-bus current. Compare only with the same current definition. |
| Continuous operating point | Current at the specified ambient temperature, bus voltage, and cooling condition. | A headline current alone does not define thermal headroom in the final enclosure. |
| Overload capability | Peak current, permitted duration, repetition rate, and I²t or trip behavior. | A multiplier does not show whether the drive can sustain a real acceleration profile. |
| Electrical compatibility | Operating voltage range, transients, feedback type, and command interface. | The nominal bus value does not establish full electrical or control compatibility. |
Evidence and method boundaries
The sources below support the measurement distinctions and the need to read overload ratings with their stated duration. They do not certify a particular 10A product.
| Source | What it supports | Boundary |
|---|---|---|
| TI: Thermally Efficient BLDC Drive PCB Design | Explains the DRV10987 thermal model and reports output RMS current alongside board and case-temperature results. | Results belong to its board and motor setup; they are not a rating for the drive being selected here. |
| TI TIDA-00772 reference design | Its 18 V / 400 W power-tool design specifies 18 A RMS continuous winding current and 60 A peak for 1 second. | Those ratings belong to that reference design only; do not generalize them to a 10A drive. |
Source pages checked September 29, 2026. Verify the latest revision and the exact product datasheet during design review.
Integration choices and trade-offs
Compare the installation constraints alongside the current estimate; package format alone does not guarantee system fit.
| Option | Potential benefit | Trade-off to assess | Best fit when |
|---|---|---|---|
| Board-level compact drive | Can simplify integration where space is limited. | Thermal transfer, connectors, EMI layout, and enclosure become system-level design tasks. | Teams that can validate the assembled motor-drive thermal and EMC behavior. |
| Enclosed or heatsinked drive | May provide a defined thermal path and more installation protection. | May increase volume, mass, and mounting constraints. | Installations where the drive needs a specified enclosure or cooling interface. |
| Lower-rated drive class | May reduce size or cost when measured demand leaves margin. | Less allowance for acceleration, overload, and temperature rise. | Predictable loads with a verified duty cycle and adequate margin. |
Have a candidate drive datasheet?
Send the stated continuous and peak current definitions, operating voltage, duty cycle, feedback type, and cooling conditions for an engineering review against your application.
Request a datasheet reviewCommon selection risks
Resolve these checks against the motor, drive, power supply, and final installation as one system.
| Risk | Warning sign | Mitigation |
|---|---|---|
| Comparing unlike current ratings | The motor estimate is bus-side, while the drive datasheet quotes winding RMS current. | Ask the supplier to identify each current definition and provide a like-for-like operating point. |
| Assuming peak current is unlimited | A load requires repeated high-torque bursts or long acceleration intervals. | Check allowed peak duration, repetition rate, I²t protection, and measured motion profile. |
| Ignoring installation heat flow | The drive sits inside a sealed joint or near a warm motor. | Review the product derating curve in the final enclosure and validate temperatures under duty cycle. |
Related drive selection resources
Use these guides to compare integration formats, other current classes, and the product family. Product pages do not replace a revision-controlled model datasheet.
- 10A compact servo drive sizing guide
Screen motor-phase current, pulse duration, and cooling before comparing supplier ratings.
- 10A board-level servo drive
Compare bare-board integration, connector, and thermal-interface constraints.
- 100A BLDC servo drive
Review a higher current class if measured demand exceeds this screening range.
- 100A low-voltage servo drive
Compare a different current class and low-voltage integration context.
- GaN low-voltage servo drive family
Browse the product family, then confirm ratings in the exact model datasheet.
- Servo drive selection guide
Prepare voltage, current, feedback, thermal, and communication requirements.
10A BLDC drive sizing questions
Answers are screening guidance; the selected drive’s datasheet and application review determine final compatibility.
Does the calculator confirm that a 10 A drive is the right size?
Why is DC-bus current different from winding current?
What does the overload factor represent?
Can a 200 W motor at 48 V use a 10 A BLDC servo drive?
How should I compare two candidate drives?
Confirm your 10A drive requirements
Share motor power, bus range, phase-current requirement, duty cycle, feedback type, and cooling conditions so the engineering team can check the right datasheet limits.
Or email [email protected] directly with your motor, current, voltage, feedback, and cooling details.