Tecnotion QTL 210, 230, 385 and 485 Torque Motors Review: Specs, Price and Applications
Updated: 4 days ago
Tecnotion QTL 210, 230, 385 and 485 are frameless, three-phase synchronous torque motors for direct integration into a machine axis. They share an open-center architecture but differ substantially in diameter, torque, inertia and cooling arrangement. The 230, 385 and 485 include a cooling ring that the machine housing must complete; these are motor components rather than complete supported rotary axes.
Quick Verdict
The QTL family is a strong candidate for an OEM rotary table, printing axis or handling mechanism where direct drive and a large center opening justify custom mechanical and thermal engineering. Choose the exact diameter and height against moving torque, holding torque and the full speed cycle. A 2202 Nm Ultimate headline does not describe continuous output, and a cooling ring does not constitute an installed cooling system.
Tecnotion QTL 210, 230, 385 and 485 Torque Motors at a Glance
Specification | Details |
Architecture | Frameless three-phase synchronous motor; separate stator and rotor; external drive, feedback, bearings and housing required |
QTL-A-210-65 / -85 / -105 | Continuous 65 / 103 / 142 Nm; stall 46 / 73 / 100 Nm; peak 140 / 211 / 281 Nm; Ultimate 173 / 259 / 346 Nm |
QTL-A-230-65 / -85 / -105 | Continuous 67 / 107 / 147 Nm; stall 48 / 76 / 104 Nm; peak 140 / 211 / 281 Nm; Ultimate 173 / 259 / 346 Nm |
QTL-A-385-85 / -105 | Continuous 407 / 560 Nm; stall 288 / 396 Nm; peak 833 / 1111 Nm; Ultimate 1026 / 1368 Nm |
QTL-A-485-85 / -105 | Continuous 659 / 907 Nm; stall 466 / 642 Nm; peak 1342 / 1789 Nm; Ultimate 1651 / 2202 Nm |
Stator OD / rotor ID | 210: 210 / 140 mm; 230: 230 / 140 mm; 385: 385 / 280 mm; 485: 485 / 366 mm |
Maximum voltage rating | 480 VAC RMS phase-to-phase (680 VDC in the catalog); this is a maximum rating, not a required supply setpoint |
Thermal rating conditions | Continuous and stall data use 100°C coils and a 20°C mounting surface; catalog specifications ±10% |
Transient rating definitions | Peak: 6 K/s temperature rise; Ultimate: 20 K/s; both stated with magnets at 25°C |
Cooling-ring models | 230, 385 and 485; housing, seals, coolant connections and external circulation remain integration work |
Temperature sensors | Three PTC 1 kΩ and three Pt1000 elements listed in the QTL tables |
Price | Request a quote for the exact motor, options and integration scope |
Design and Engineering Assessment
The open center is a machine-design resource: it can provide room for cables, hoses or a central mechanism without routing them around a gearbox. It does not solve continuous cable rotation. Any slip ring, rotary fluid union or cable-management limit must be designed around the actual travel and service life. The rotor opening also does not specify an allowable bearing load; the machine designer supplies and validates the load support.
Direct drive removes gearbox backlash and reduction stages, while exposing the control system directly to load inertia, torque disturbances and structural compliance. The encoder location, bearing stiffness and frame modes therefore become central to positioning performance. A motor torque rating alone establishes neither angular accuracy nor machine settling time. Those depend on the assembled axis and its measurement system.
The thermal distinction is especially important for indexing and clamping axes. For QTL-A-485-105, the catalog lists 907 Nm continuous torque but 642 Nm stall torque under its stated conditions. A mechanism that holds at one electrical position cannot simply apply the moving continuous rating indefinitely. Model the actual time spent accelerating, moving, settling and holding, then validate temperatures at the most demanding cycle.
All four series in this comparison have different electromagnetic and mechanical tradeoffs. The 210 and 230 share a 140 mm rotor opening and corresponding torque classes, but the 230 adds a cooling ring and more stator diameter. The 385 and 485 increase both the opening and available torque substantially. They are not drop-in replacements for each other, and family maxima should never be combined into an imaginary smallest, fastest, highest-torque configuration.
QTL 210 versus QTL 230: the cooling decision
For the three 65, 85 and 105 mm heights, QTL 210 continuous ratings are 65, 103 and 142 Nm. Corresponding QTL 230 ratings are 67, 107 and 147 Nm. Their peak and Ultimate torque columns match at the same height. The additional ring changes the thermal and packaging arrangement; it does not turn a transient torque limit into a continuous one.
QTL 230 coolant figures are also configuration-specific: 3.5, 5.3 and 7.0 L/min for a 3 K coolant temperature difference, with listed pressure drops of 0.7, 1.0 and 1.5 bar. Those values describe the motor cooling arrangement. The pump must also overcome the rest of the circuit, and the installation needs appropriate sealing, filtration and leak management.
QTL 385 versus QTL 485: size, inertia and throughput
At 85 and 105 mm heights, QTL 385 provides 407 and 560 Nm continuous torque; QTL 485 provides 659 and 907 Nm. Maximum-speed entries at the catalog maximum voltage and continuous torque are 231 / 164 rpm for the 385 and 138 / 96 rpm for the 485. These operating points should be checked against the selected bus voltage and the complete torque-speed envelope.
The larger rotor also changes acceleration demand. Catalog rotor inertia is 0.146 / 0.195 kg m² for the 385 and 0.357 / 0.476 kg m² for the 485. Calculate acceleration torque from motor plus reflected load inertia and add process and friction torque. A larger motor can provide more torque while also requiring more torque to accelerate its own rotor.
Build the cooling channel as part of the machine
The cooling ring must be closed by the surrounding housing to form its channel. Specify the housing interfaces, seals, coolant compatibility, pressure limits and service procedure from the installation documentation. A motor photograph does not establish that these items are included. Temperature monitoring should participate in fault handling before thermal damage occurs.
At the specified 3 K coolant difference, QTL 385 flow entries are 9.8 / 13.1 L/min, while QTL 485 lists 12.4 / 16.5 L/min for the 85 / 105 variants. The heat rejection is a meaningful machine subsystem. Check chiller capacity and coolant inlet conditions rather than sizing only a nominal pump flow.
Select the amplifier and measurement system together
The catalog lists RMS currents. QTL 210 and 230 peak current is 16.9 A RMS and Ultimate current 22.0 A RMS; QTL 385 and 485 list 33.8 and 44.0 A RMS respectively. Drive advertisements using peak-amplitude current require the appropriate conversion and duty comparison. Do not compare differently defined current numbers directly.
Check phase resistance, inductance, back EMF, bus voltage, switching limits and regeneration against the exact winding. Supply an appropriate angular feedback device and confirm commutation alignment and pole count. The motor component does not include an EtherCAT, CANopen or other network controller; those interfaces belong to the selected amplifier and machine architecture.
Commissioning and acceptance
Verify concentricity, air-gap clearance and axial positioning before energizing the motor, following the model drawing and installation manual. Permanent-magnet assembly forces call for suitable handling fixtures and a controlled installation sequence. Check free rotation and sensor wiring before applying motion commands.
Commission with controlled current and speed limits, then test the actual load and coolant conditions. Record following error, settling, torque demand, winding and mounting temperatures, and bus behavior during deceleration. Include a cooling-loss response and a separately engineered holding or braking provision where the mechanism requires it. Motor torque and a drive disable command do not substitute for a machine safety design.
Alternatives and selection boundaries
Within Tecnotion, a smaller QTR can be more appropriate when torque and diameter requirements are lower, while QTL 290 and 310 occupy intermediate sizes outside the four series detailed here. Compare the whole assembled axis against a housed torque motor or a geared servo solution. The latter may reduce the custom mounting task, but adds its own transmission, maintenance and output-error considerations.
Applications and Selection
Tecnotion identifies rotary indexing tables, printing machinery, materials handling and related industrial machinery as QTL applications. Consider the motor for those mechanisms where the large bore and direct-drive topology fit the motion cycle. The machine still needs validated bearings, feedback, thermal management, guarding and control; these are selection possibilities rather than claimed ATC installations.
For Tecnotion QTL 210, 230, 385 and 485 Torque Motors, define the actual machine duty before selecting an ordering configuration. Include the required operating point, available installation space, environment and control interfaces. The specification table describes the product or family; the surrounding machine determines which of those features matters for the intended job.
Price and Value
Price: Request a quote for the exact configuration. Compare the product, compatible control equipment, required mechanical parts, cabling and commissioning as one installed system. A component price alone does not represent the cost of a working automation axis.
Evaluate an alternative against the same duty and acceptance criteria. Match the continuous operating requirement first, then compare transient capability, feedback, mechanical fit and support. This avoids choosing between superficially similar products whose ratings describe different operating conditions.
Pros and Cons
Advantages
Large open rotor diameters from 140 to 366 mm across the compared series
Explicit continuous, stall, peak and Ultimate ratings support duty-specific sizing
Direct-drive architecture avoids a gearbox stage
Cooling-ring variants provide a defined route for integrating liquid cooling
Limitations
Frameless construction requires custom bearings, housing, feedback and assembly control
High torque and heat rejection place substantial demands on the surrounding machine
Stall ratings are lower than moving continuous ratings
Peak and Ultimate ratings cannot be sustained indefinitely
Who Should Consider Tecnotion QTL 210, 230, 385 and 485 Torque Motors?
Consider these QTL series when designing a direct-drive indexing, printing or handling axis with a large central opening and sufficient engineering scope for custom mechanical support and cooling. Establish moving and holding torque separately, then validate the selected configuration on a representative loaded cycle.
Tecnotion QTL 210, 230, 385 and 485 Torque Motors FAQ
Are QTL 210 and QTL 230 the same motor configuration?
They are related but distinct series. QTL 230 adds a cooling ring and uses a 230 mm stator outer diameter; QTL 210 is 210 mm. Both have a 140 mm rotor opening. Their corresponding heights have different continuous and stall ratings, even though the listed peak and Ultimate torque values match.
Can QTL 485 deliver 2202 Nm continuously?
No. QTL-A-485-105 is listed at 2202 Nm Ultimate torque, 1789 Nm peak, 907 Nm continuous and 642 Nm stall. The continuous and stall figures depend on the documented thermal conditions; the transient limits have different temperature-rise definitions.
What does the cooling ring include?
It provides the motor-side cooling structure. The surrounding housing must close the channel, and the installation needs seals, connections and external coolant circulation. Specify the completed circuit and confirm its pressure, flow and coolant requirements for the exact model.
Does a frameless QTL include bearings and an encoder?
The reviewed motor is a stator-and-rotor component. The machine design must provide suitable bearing support, a housing and an angular measurement system, as well as the external amplifier and controller. Confirm the exact quotation scope before ordering.
Which torque rating should be used for holding position?
Evaluate the exact stall rating and holding duty. Moving continuous torque is not automatically the permissible steady holding torque. Include mounting temperature, current distribution, dwell duration and the mechanical need for a holding brake in the axis design.
Can all QTL variants operate at their catalog maximum speed on a lower-voltage bus?
No. Available speed depends on bus voltage, back EMF, load and the selected winding. Use the model torque-speed data or manufacturer sizing tool for the intended supply and cycle rather than carrying over the maximum-voltage speed entry.
How much do these motors cost?
Request a quote for the exact diameter, height, winding, cable and sensor arrangement. Compare the total installed axis cost, including bearings, encoder, amplifier, housing, cooling hardware and commissioning, rather than the motor component alone.
What should an acceptance test demonstrate?
Test the real load cycle and required settling behavior while monitoring current, thermal conditions and bus voltage. Verify air-gap clearance, feedback alignment and cooling-loss handling, and document the machine-level safety and holding provisions separately.
Prices are indicative and may change. Confirm the final configuration, commercial terms and delivery schedule before ordering.
