Product overview
The T-MOTOR AT4125 long shaft motor is designed for fixed-wing and VTOL aircraft, with an intended VTOL fixed-wing application range of 8–10 kg. It comes in KV250 and KV540 variants and uses bearings, high-strength steel, lightweight aluminum and neodymium rare-earth magnets. Both variants measure 50 mm in diameter by 74 mm, use a 12N14P configuration and have 100 mm enameled-wire leads. Their shaft diameters are 6 mm at both the IN and OUT positions. T-MOTOR recommends pairing the motor with its AT115A ESC and FS15*8 folding propellers.
The KV250 variant is rated for 12S LiPo batteries and weighs 350 g including cable, with 68 mΩ internal resistance and an idle current of 1.0 A at 10 V. Its peak current is 50 A and maximum power is 2200 W, both rated for 180 seconds. The KV540 variant is rated for 6S LiPo batteries and weighs 355 g including cable, with 14 mΩ internal resistance and an idle current of 2.6 A at 10 V. Its corresponding 180-second ratings are 85 A peak current and 2000 W maximum power.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer and model | T-MOTOR AT4125 long shaft motor |
| Intended application | VTOL fixed-wing aircraft in the 8-10kg rangeApplication range; confirm suitability for the selected aircraft configuration. |
| Construction | Bearings, high-strength steel, lightweight aluminum and neodymium rare-earth magnets |
| Recommended integration components | T-MOTOR AT115A and FS15*8 folding propellersManufacturer recommendation for integration. |
| Published supplied configuration | One motor listed as T-MOTOR AT3520 and one hardware packThe packing list names AT3520 despite the AT4125 page identity; confirm the supplied motor model. |
| Packaging | Packaging weight: 525g; packaging size: 145*95*65mmPackage measurements, not motor dimensions or motor weight. |
| Test item — KV250 | Long Shaft KV250 |
| Weight including cable — KV250 | 350gKV250 variant; weight includes cable. |
| Motor dimensions — KV250 | Φ50*74mm |
| Internal resistance — KV250 | 68mΩ |
| Configuration — KV250 | 12N14P |
| Rated voltage — KV250 | 12SKV250 variant; published LiPo rating. |
| Idle current — KV250 | 1.0AKV250 variant; specified at 10V. |
| Peak current — KV250 | 50AKV250 variant; 180-second peak-current rating. |
| Maximum power — KV250 | 2200WKV250 variant; 180-second maximum-power rating. |
| Specification-table recommendation — KV250 | /KV250 specification table shows a slash; component recommendations appear separately in the product description. |
| Test item — KV540 | Long Shaft KV540 |
| Weight including cable — KV540 | 355gKV540 variant; weight includes cable. |
| Internal resistance — KV540 | 14mΩ |
| Rated voltage — KV540 | 6SKV540 variant; published LiPo rating. |
| Idle current — KV540 | 2.6AKV540 variant; specified at 10V. |
| Peak current — KV540 | 85AKV540 variant; 180-second peak-current rating. |
| Maximum power — KV540 | 2000WKV540 variant; 180-second maximum-power rating. |
| Lead enameled wire — both variants | 100mm |
| Motor dimensions — KV540 | Φ50*74mm |
| Configuration — KV540 | 12N14P |
| Performance-data limitation | Reference-only bench resultsPublished bench-test data are for reference only; comparison with other motor types is discouraged. |
| Temperature measurement qualification | Motor surface temperature at 100% throttle running for three minutesTemperature refers to the motor surface at 100% throttle after three minutes of operation. |
| Shaft diameter — both variants | IN: 6mm; OUT: 6mm |
| Specification-table recommendation — KV540 | /KV540 specification table shows a slash; component recommendations appear separately in the product description. |
| Intended aircraft | 8–10 kg VTOL fixed-wing aircraftManufacturer suitability statement |
| KV250 rated voltage | 12S LiPoLong Shaft KV250 variant |
| KV540 rated voltage | 6S LiPoLong Shaft KV540 variant |
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