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QTL 485 Series – Frameless Torque Motor

Water cooled frameless rotary torque motor with continuous torque from 659 Nm to 907 Nm, peak torque from 1342 Nm to 1789 Nm and speeds up to 138 rpm. The largest and highest torque motor in the range, with a 485 mm outside diameter and 366 mm through bore.

Product Overview

Motion Type

Rotary

Technology

Frameless Torque

Product Range

Torque Motors

Series

QTL 485

Key Performance Specs

  • Continuous Torque Up To: 907 Nm
  • Speed Up To: 138 rpm
  • Outside Diameter: 485 mm
  • Inside Diameter: 366 mm

Key Features

  • Continuous torque range 659 Nm to 907 Nm
  • Peak torque range 1342 Nm to 1789 Nm
  • Speed up to 138 rpm at 680 V dc
  • Motor outside diameter 485 mm
  • Motor inside diameter 366 mm
  • Motor heights 85 mm and 105 mm
  • Integrated cooling ring for high duty cycles
  • PTC 1 kΩ and PT1000 thermal protection
  • Frameless direct drive design

QTL 485 Series – Frameless Torque Motor

QTL 485 Series of Frameless Rotary Torque Motors

Introducing the QTL 485 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 485 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 485 Series – Frameless Torque Motor

QTL 485 Series Symbol Unit QTL-A 485-85 QTL-A 485-105
Winding type I I
Motor type, max voltage ph-ph (3-phase synchronous) V ac rms (V dc) 480 (680)
Ultimate torque (magnet @ 25°C) Tu Nm 1651 2202
Peak torque (magnet @ 25°C) Tp Nm 1342 1789
Continuous torque (coil @ 100°C) Tc Nm 659 907
Stall torque (coil @ 100°C) Ts Nm 466 642
Maximum speed (@ Tc @ 680 V dc) nmax rpm 138 96
Motor torque constant (up to Ic) Kt Nm/Arms 41.7 55.6
Motor constant (coils @ 25°C) Km (Nm)²/W 218.5 310.7
Ultimate current (magnet @ 25°C) Iu Arms 44.0 44.0
Peak current (magnet @ 25°C) Ip Arms 33.8 33.8
Maximum continuous current (coils @ 100°C) Ic Arms 15.8 16.3
Stall current (coils @ 100°C) Is Arms 11.2 11.5
Back EMF phase-phase peak Ke V/krpm 3569 4758
Back EMF phase-phase rms Ke V/krpm 2523 3364
Coil resistance per phase (coils @ 25°C ex. cable) R Ω 2.66 3.32
Coil induction per phase (I < 0.6 Ip) L mH 14.5 19.0
Electrical time constant τe ms 5.4 5.7
Poles Nmgn nr 62
Continuous power loss (coils @ 100°C) Pc W 2584 3444
Thermal resistance (coils to mount. sfc.) Rth °C/W 0.031 0.023
Thermal time constant τth s 47 44
Water cooling flow (for ΔT=3K) Φw l/min 12.4 16.5
Temperature cut-off / sensor PTC 1 kΩ (3x) / PT1000

Product Dimensions: QTL 485 Series – Frameless Torque Motor

QTL 485 Mechanical Symbol Unit QTL-A 485-85 QTL-A 485-105
Stator OD ODs mm 485
Rotor ID IDR mm 366
Motor height Hmotor mm 85 105
Lamination stack height Hlam mm 60 80
Rotor inertia JR kg·m² 0.357 0.476
Stator mass (excluding cables) MS kg 18.75 25
Rotor mass MR kg 9.68 12.9
Total mass (excluding cables) MT kg 28.43 37.9
Cable mass (all cables) m kg 0.5
Cable type (power), length 2 m d mm (AWG) 10.6 (13)
Cable type (sensor), length 2 m d mm (AWG) 8.9 (22)

Product Technical Drawings: QTL 485 Series – Frameless Torque Motor

QTL 485 Series - Frameless Torque Motor technical drawing