Among the key additions to the latest maxon motor ‘catalogue and selection program’ is a 22mm diameter brushless dc unit that gives extra options to design engineers seeking top performance while minimising size and weight.
The EC-powermax 22, available in 90 and 120 Watt power ratings, and with a choice of two lengths to suit different designs, expands the successful EC-powermax program with which maxon has increased the performance to volume and weight ratio of EC (electronically commutated) dc motors to the highest levels.
An advance on the already impressive maxon EC-max premium motors, the 30mm and now 22mm EC-powermax units have been boosted by a powerful four-pole magnet which replaces the two-pole rotor of their predecessors. For this, maxon has insisted on the best magnetic material currently available on the market.
The four-pole magnet rotates around a stationary winding whose unique design forms a grooveless stator, with no air gaps, that ensures efficient, detent-free operation. This provides excellent control characteristics, particularly for positioning tasks. Precise detection of the rotor’s position is achieved with the use of Hall sensors.
Like every motor in maxon’s extensive EC range, the inherent advantages of the new products over motors with brushes include almost unlimited life, smooth performance, a very broad speed range and the ability to reach high speeds even at low voltages.
Thanks to maxon’s modular system, even greater versatility is possible by combining the EC-powermax 22 with 32mm planetary gearheads. It is also, of course, fully compatible with maxon’s range of controllers and other system components.
“The EC-powermax 22 produces extremely high torque at slow speeds compared to other brushless motors of a similar size,” says Keith Ellenden, CEO of maxon motor uk. “Its exceptional power to size and weight ratio, together with the build quality and reliability designers have learned to expect from maxon, makes it ideal for applications such as medical devices and hand-held tools - including machines for slicing and drilling.”