QTL 310 Series – Frameless Torque Motor
Water cooled frameless rotary torque motor with continuous torque from 151 Nm to 331 Nm, peak torque from 316 Nm to 632 Nm and speeds up to 298 rpm. An integrated cooling ring suits high duty cycle applications, with a 310 mm outside diameter and 220 mm through bore.
Product Overview
| Motion Type | Rotary |
|---|---|
| Technology | Frameless Torque |
| Product Range | Torque Motors |
| Series | QTL 310 |
Key Performance Specs
- Continuous Torque Up To: 331 Nm
- Speed Up To: 298 rpm
- Outside Diameter: 310 mm
- Inside Diameter: 220 mm
Key Features
- Continuous torque range 151 Nm to 331 Nm
- Peak torque range 316 Nm to 632 Nm
- Speed up to 298 rpm at 680 V dc
- Motor outside diameter 310 mm
- Motor inside diameter 220 mm
- Motor heights 65 mm, 85 mm and 105 mm
- Integrated cooling ring for high duty cycles
- PTC 1 kΩ and PT1000 thermal protection
- Frameless direct drive design
QTL 310 Series – Frameless Torque Motor
QTL 310 Series of Frameless Rotary Torque Motors
Introducing the QTL 310 Series frameless rotary torque motor by Tecnotion. Torque motors excel in their direct drive capabilities, eliminating the need for a transmission or gearbox. The rotor of the torque motor is securely attached directly to the driven part, reducing transmission losses and eliminating the cost and maintenance associated with additional components. With no contact between the rotor and stator, mechanical wear is eliminated, resulting in reduced maintenance and extended lifespan. These motors provide a high continuous torque throughout the entire rev-range. The required torque and available space play a role in determining the motor’s diameter and width. This allows for slim motors in height but large in diameter for applications such as axles and turntables, or compact yet high-torque motors with similar height and diameter dimensions.
Water Cooling for High Duty Cycles
The QTL 310 Series is fitted with an integrated cooling ring, allowing the motor to sustain higher continuous torque under demanding duty cycles. Liquid cooling draws heat away from the stator efficiently, keeping performance stable during prolonged high load operation and helping to extend motor life.
Applications for Torque Motors
Frameless torque motors find applications in a variety of industries and fields. They are commonly used in robotics, precision manufacturing, semiconductor manufacturing equipment, medical devices, aerospace, and defence systems. The compact design and high torque output make them ideal for applications where space is limited, yet high-performance and direct drive capabilities are required. Frameless torque motors are also well-suited for tasks that demand precise and accurate motion control, such as rotary tables, indexers, and positioning systems. Their versatility and reliability make them a preferred choice for demanding applications across multiple industries.
Product Specifications: QTL 310 Series – Frameless Torque Motor
| QTL 310 Series | Symbol | Unit | QTL-A 310-65 | QTL-A 310-85 | QTL-A 310-105 |
| Winding type | N | N | N | ||
| Motor type, max voltage ph-ph (3-phase synchronous) | V ac rms (V dc) | 480 (680) | |||
| Ultimate torque (magnet @ 25°C) | Tu | Nm | 389 | 583 | 778 |
| Peak torque (magnet @ 25°C) | Tp | Nm | 316 | 474 | 632 |
| Continuous torque (coil @ 100°C) | Tc | Nm | 151 | 241 | 331 |
| Stall torque (coil @ 100°C) | Ts | Nm | 107 | 170 | 234 |
| Maximum speed (@ Tc @ 680 V dc) | nmax | rpm | 298 | 182 | 124 |
| Motor torque constant (up to Ic) | Kt | Nm/Arms | 19.7 | 29.5 | 39.3 |
| Motor constant (coils @ 25°C) | Km | (Nm)²/W | 27.0 | 45.5 | 64.7 |
| Ultimate current (magnet @ 25°C) | Iu | Arms | 22.0 | 22.0 | 22.0 |
| Peak current (magnet @ 25°C) | Ip | Arms | 16.9 | 16.9 | 16.9 |
| Maximum continuous current (coils @ 100°C) | Ic | Arms | 7.70 | 8.16 | 8.42 |
| Stall current (coils @ 100°C) | Is | Arms | 5.44 | 5.77 | 5.96 |
| Back EMF phase-phase peak | Ke | V/krpm | 1681 | 2521 | 3362 |
| Back EMF phase-phase rms | Ke | V/krpm | 1189 | 1783 | 2377 |
| Coil resistance per phase (coils @ 25°C ex. cable) | R | Ω | 4.77 | 6.37 | 7.96 |
| Coil induction per phase (I < 0.6 Ip) | L | mH | 23.9 | 34.7 | 45.5 |
| Electrical time constant | τe | ms | 5.0 | 5.5 | 5.7 |
| Poles | Nmgn | nr | 38 | ||
| Continuous power loss (coils @ 100°C) | Pc | W | 1102 | 1653 | 2204 |
| Thermal resistance (coils to mount. sfc.) | Rth | °C/W | 0.073 | 0.048 | 0.036 |
| Thermal time constant (up to 63% max. coil temp.) | τth | s | 49 | 44 | 41 |
| Water cooling flow (for ΔT=3K) | Φw | l/min | 5.3 | 7.9 | 10.5 |
| Water cooling pressure drop (order of magnitude) | ΔPw | bar | 1.0 | 1.4 | 2.0 |
| Temperature cut-off / sensor | PTC 1 kΩ (3x) / PT1000 (3x) | ||||
All specifications ±10%. Actual values depend on bus voltage. Values assume a mounting surface at 20°C with the motor driven at maximum continuous current. Thermal resistance is based on the given water flow and pressure.
Product Dimensions: QTL 310 Series – Frameless Torque Motor
| QTL 310 Mechanical | Symbol | Unit | QTL-A 310-65 | QTL-A 310-85 | QTL-A 310-105 |
| Stator OD | ODs | mm | 310 | ||
| Rotor ID | IDR | mm | 220 | ||
| Motor height | Hmotor | mm | 65 | 85 | 105 |
| Lamination stack height | Hlam | mm | 40 | 60 | 80 |
| Rotor inertia | JR | kg·m² | 0.031 | 0.046 | 0.061 |
| Stator mass (excluding cables) | MS | kg | 7.4 | 10.1 | 12.9 |
| Rotor mass | MR | kg | 2.3 | 3.5 | 4.7 |
| Total mass (excluding cables) | MT | kg | 9.7 | 13.6 | 17.6 |
| Cable mass (all cables) | m | g | 500 | ||
| Cable type (power), length 2 m | d | mm (AWG) | 10.6 (13) | ||
| Cable type (sensor), length 2 m | d | mm (AWG) | 6.4 (25) | ||
Product Technical Drawings: QTL 310 Series – Frameless Torque Motor












