From robotics and prosthetics to medical and laboratory technology and pump applications - Faulhaber is increasingly being confronted with user demands: More performance in the smallest space! According to Andreas Seegen, Head of Marketing at the drive technology specialist from Schönaich, the design of the motor winding and its production are essential for very compact but nevertheless extremely high-torque motors: „This is where we started and developed a new series on the basis of classic external rotor motors. 

The powerful ‚heart‘ of the so-called BXT series is the electromagnetic design of the stator and rotor. With fourteen strong NdFeB single magnets on the rotor and twelve teeth on the stator, Faulhaber has combined proven technologies with an innovative winding technology, according to Seegen. This means that the copper filling factor in the active part of the winding is extraordinarily high, and at the same time the space requirement has been reduced to a minimum by laying the wires. As a result, the brushless DC servomotors deliver torques of up to 134 mNm with diameters of 22 mm, 32 mm and 42 mm respectively and a continuous output of up to 100 watts. „The compact motors significantly exceed the output values customary in this drive class,“ says Seegen. Above all, the ratio of torque to installation space and weight is considerably better than the market standard. When asked about specific application possibilities for the new motors, Seegen replied: „In the case of a forearm prosthesis, for example, the small motor is suitable for the hand and the middle motor for the elbow. Other applications include robot grippers, industrial automation, humanoid robots and even biorobotics. Dialysis machines and medical pumps, for example, can also benefit from the good synchronization properties.“ The series is equipped with digital Hall sensors as standard and is designed for speeds of up to 10,000 rpm. The motors can be combined with various gearboxes, encoders, brakes and controls from the Faulhaber range. By modifying the mechanical and electrical interfaces, they can also be individually adapted to the application if required. As with other Faulhaber motor families, the user can choose between motors with or without a housing. Seegen: „The BXT R unhoused versions are particularly recommended for speed-controlled applications in which high power is converted, since the heat is optimally dissipated here. However, it must be ensured that the rotor can rotate freely in the application. The housing versions BXT H, on the other hand, are particularly suitable for positioning applications as they can be combined with a large number of optical and magnetic encoders“.