Torque Motors Technology – short and to the point
Multipole design enables maxon torque motors to produce very high torques. Combined with the internal rotor, this results in a highly dynamic performance. The outer winding can be ironless (ECX PRIME) or iron-core (ECX TORQUE, EC-i). Iron-core windings cause a slight cogging torque.
1 Front flange 2 Housing 3 Stator packet 4 Winding 5 Permanent magnet 6 Shaft 7 Print with Hall sensors 8 Ball bearing 9 Preload 10 Rear flange
BLDC Motors with ironless winding Properties – Brushless DC Motor (BLDC) – 4-pole NdFeB permanent magnet – Stationary ironless winding – High torques combined with high speeds – Speeds of up to 50,000 rpm – No cogging torque – Linear gradients – Hall sensor signals can be used for basic speed and position control Specific properties of ECX PRIME motors: – Highest power density thanks to a rotor with two pole pairs – Ironless maxon winding with optimized sub‑winding configuration – Speeds up to 50,000 rpm – High‑quality return path material to reduce eddy current losses – Mechanical time constants under three milliseconds – Special versions – Good heat dissipation – High overload capacity ECX PRIME
BLDC Motors: Winding with iron core Properties – Brushless DC Motor (BLDC) – Multipole NdFeB permanent magnet – Stationary winding with iron core and multiple teeth per phase – High torque – Speeds of up to 20,000 rpm – Slight cogging torque – Gradients that deviate from strictly linear behavior – Small commutation steps – Hall sensor signals can be used for basic speed and position control – Good heat dissipation ECX TORQUE and EC-i Specific properties of ECX TORQUE motors: – Highly dynamic due to internal multi-pole rotor – Mechanical time constant below one millisecond – High torque density – Can be configured online (ECX TORQUE)
Design Overload capacity of ECX PRIME vs. saturation point of EC‑i (iron core) ECX PRIME motors have a very high over- load capacity due to their ironless windings and high-quality magnet materials, as no magnetic saturation can occur in the iron core. Their extremely rigid torque-speed behavior enables high peak torques and dynamic reserves without the motor’s magnetic field being limited or abrupt reductions in efficiency. In contrast, iron-core EC‑i motors reach their saturation point faster at high load currents because the iron limits the mag- netic flux. Under overload, this results in higher current draw, more heating, and earlier limitation of the usable peak power.
76 maxon
© 2026 maxon. All rights reserved.
Made with FlippingBook Publishing Software