Internal-rotor BLDC motor kit; rotor and stator delivered separately without bearings or motor shaft; sensorless design without Hall sensor signals per the EC frameless DT installation manual
Motion & Actuation · Frameless brushless DC motor kit
EC frameless DT 50 S 734439
This record freezes maxon ordering number 734439 from the current EC frameless DT range; the older EC frameless flat parts (for example 548273 and 588849) are marked NRND in the same catalog and are deliberately not selected. Values are the catalog figures at 48 V nominal voltage; stall figures are electrical endpoints, not thermal ratings.
maxon EC frameless DT 50 S (734439) · Also: 734439, EC frameless DT 50 S, Ø54 mm, brushless, 220 W
What this record can support today.
Coverage is computed from published, non-unknown fields. It measures the record—not product quality—and makes missing procurement evidence explicit.
Engineering field coverage73%
8 of 11 selected fields published
- Official product sourcepublished
- Lifecycle statepublished
- Mechanical dimensions / mass / mountingpublished
- Environmental operating limitspublished
- Continuous or rated outputpublished
- Peak / momentary outputpublished
- Speed boundarypublished
- Transmission ratio / errormissing
- Electrical input / consumptionpublished
- Control and communication interfacemissing
- Position / torque feedbackmissing
Procurement field coverage15%
2 of 13 selected fields published
- Official product / sales routepublished
- Lifecycle statepublished
- Exact orderable SKU / part numbermissing
- Price with region, currency and quantitymissing
- Lead time with check datemissing
- Commercial availability / stock statemissing
- Minimum order quantitymissing
- Authorized distributor / sales channelmissing
- CAD / STEP / interface drawingmissing
- Certification with identifiermissing
- MTBF / failure / reliability datamissing
- Warranty termsmissing
- PCN / EOL / replacement noticemissing
Coverage measures whether a selected public field is present with non-U evidence. It is not a product score, compatibility result, certification, availability confirmation or procurement recommendation. Download the complete readiness coverage JSON →
Reported values, conditions attached.
Evidence state describes the claim—not the prestige of the company or document.
| Claim | Reported value | Condition / boundary | State | Source |
|---|---|---|---|---|
| Ordering numberorder_number | 734439 | EC frameless DT 50 S, Ø54 mm, brushless, 220 W catalog product. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Nominal voltagenominal_voltage | 48 V | Values-at-nominal-voltage table. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Nominal torque (max. continuous torque)continuous_torque | 368 mN·m | Catalog rating at nominal voltage; the mounting and heat-dissipation situation of the installed kit governs the real thermal envelope.The May 2025 catalog-page PDF for the same part (EC-frameless-DT-50-S-EN-05-2025) lists 322 mNm; the live 2026 catalog value is carried here and the discrepancy is unresolved. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Nominal current (max. continuous current)continuous_current | 4.9 A | Catalog rating paired with the nominal-torque figure. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Nominal speednominal_speed | 5510 rpm | Values-at-nominal-voltage table. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| No-load speedno_load_speed | 6650 rpm | No-load endpoint; not a loaded operating point. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Stall torquestall_torque | 1890 mN·m | Electrical stall endpoint at nominal voltage (stall current 81.2 A); not a continuous or thermally sustainable rating. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Maximum speedmax_speed | 7000 rpm | Mechanical-data limit, not a recommended continuous operating point. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Torque constanttorque_constant | 68.5 mN·m/A | Characteristics table. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Terminal resistanceterminal_resistance | 0.591 Ω | Characteristics table. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Thermal resistances and time constantsthermal_data | Housing–ambient 4.02 K/W; winding–housing 0.572 K/W; winding time constant 7.81 s; motor time constant 453 s | Catalog thermal data; reference mounting conditions of the catalog measurement are not restated on the product page. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Ambient and winding temperature limitstemperature_limits | Ambient −40 to +100 °C; max. winding temperature +155 °C | Thermal-data table. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Number of pole pairspole_pairs | 10 | Other-specifications table; 3 phases. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Weightmass | 225 g | Catalog product weight for the kit as delivered. | M · Manufacturer claimed | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Reference mounting condition behind the continuous ratingkit_reference_mounting | Not published in cited public evidence | RCI checked the cited official public evidence on the verification date.The product page publishes nominal (continuous) torque and thermal resistances but does not restate the reference mounting, heatsink or cooling condition under which the frameless kit sustains the continuous rating in a customer housing. | U · Unknown | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
| Independent assembled-joint thermal and torque validationindependent_joint_test | Not published in cited public evidence | RCI checked the cited official public evidence on the verification date.RCI has not received, assembled, commutated, loaded or thermally tested this motor kit. | U · Unknown | maxon EC frameless DT 50 S (734439) online catalog product page ↗Specifications tab: values at nominal voltage, characteristics, thermal data, mechanical data and product weight · Live online catalog observed on the verification date; catalog-page download listed as version 2026 Checked 2026-08-19 |
Known limits
What this record does not prove.
- Stall torque and no-load speed are opposite electrical endpoints and must not be combined into an operating point.
- The live 2026 catalog nominal torque (368 mNm) differs from the May 2025 catalog-page PDF (322 mNm); the conflict is recorded, not resolved.
- The frameless kit is delivered without bearings or shaft; the customer housing determines the real thermal envelope. No RCI physical test exists.