EC motors are also called brushless DC motors. The design corresponds to that of a three-phase synchronous motor with a permanently excited magnetic rotor. There are no life-limiting components (except ball bearings), such as the carbon brush in DC motors. In contrast, the control behavior and characteristic of EC motors is similar to that of a DC motor. Due to the simple and robust design and the low demands on the control electronics, this motor type can be used with a simplified frequency inverter with block commutation. A plastic-bonded neodymium magnetic ring is used inside. Due to its compact magnetic ring, it is particularly suitable for higher speeds. Compared to a conventional asynchronous motor, the EC motor has a higher power density. In combination with a rotor position detection system based on Hall technology (RLE), it can also be used as a variable-speed drive. The EC series from Heidrive GmbH consists of three sizes in different lengths and covers a power range from 35 W to 220 W. This corresponds to a nominal torque of 0.1 Nm to 0.7 Nm. The motors specified here have a 3-fold overload capacity.
The design of BLDC motors is very similar to that of the EC motors described above. However, a highly efficient permanent magnet rotor is used here. The sintered rare earth magnet segments (Nd-FeB) used result in a higher efficiency and thus a higher power output. The higher energy density of this motor type also allows a more compact size
reach. BLDC motors use a higher quality and very robust Hall-based encoder system (HES) with various signal outputs. BLDC motors are particularly suitable for dynamic drives in 4Q operation. The BLDC series from Heidrive GmbH consists of two sizes, each with two overall lengths and covers a power range from 200 W to 800 W. This corresponds to a nominal torque of 0.65 Nm to 2.55 Nm. The motors specified here have a 4-fold overload capacity.