The choice of torque motor or servo motor often involves compromises. A new torque motor design, however, may offer a better option. Thanks to a new electromagnetic design, continuous torque in the TMK motor has increased by 30% and the maximum speed has been increased by up to 3.5 times compared with the design of classical torque motors. What the developers have done is take full advantage of the common but little used feature of flux weakening. Their design focuses the flux better than traditional rotor designs. An additional advantage of the new motor design is the integration of magnets into slots.
The laminated structure of the rotor and the optimization of the rotor teeth are responsible for the increase in the motorâ€šÃ¢â‚¬â„¢s speed. The motor speed is increased by a ratio of 2.5 to 3.5 in continuous mode. Thanks to the increase in torque and speed, the TMK series suits rotary tables operating in dual mode: positioning (high torque, low speed) and turning (high speed, low torque).
The TMK is currently available in 12 sizes, with larger sizes available in the near future. The smallest model currently available measures 198 mm in diameter and is 100 mm wide, while the largest is 385 mm in diameter and 210 mm wide, with a peak torque ranging from 113 to 2120 Nm. The maximum speeds are 5170 rpm for the TMK0175, 2500 rpm for TMK0291 and 1700 rpm for the TMK0360 motors. The TMK motor series has a high peak force density in the magnetic gap (10 N/cm2), and an accurate thermal control when using the IMTHP module.
The motor is compatible with industry standard 3-phase digital brushless motor controllers and can be successfully integrated into machines of all major CNC brands.
Filed Under: Motion control • motor controls, Motors (direct-drive) + frameless motors
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