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Brushless Motor - Highly Efficient and Controllable
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Date Added: 3rd February 2011
The maxon motor range of brushless motors encompasses exceptional quality and usability, along with incredible durability.
Highly efficient with speeds up to and above 50,000 rpm, the Maxon EC motors also offer linear motor characteristics, excellent control properties and good heat dissipation with a high overload capacity. Furthermore, they have low residual unbalance and a rotating neodymium permanent magnet with one or two pole pairs.
EC-max
The EC-max range has an attractive price:performance ratio, making it the ideal option when quality and reliability is required without prohibitive cost. With a robust steel casing and rotor with one pole pair, this brushless motor is capable of speeds up to 20,000 rpm.
EC-4pole
The EC-4pole range offers the highest power density thanks to the rotor with two pole pairs. It features a knitted winding system with optimized interconnection of the partial windings and can reach speeds of 25,000 rpm. The high quality magnetic return material reduces eddy current losses and mechanical time constants are below 3 ms.
Long service life
Maxon brushless motors offer incredible longevity through the use of preloaded ball bearings. These have been specially designed to offer tens of thousands of hours of service, ensuring productivity remains at a maximum. Service life will be affected by maximum speed, residual unbalance and bearing load, but all maxon motor products are built to last even under the most difficult situations.
Electronical commutation
Two options are available with the brushless motors - block commutation and sensorless block commutation.
In the block commutation set-up, rotor position is reported by three in-built Hall sensors. These are arranged offset by 120° to provide six different signal combinations per revolution. Furthermore, the three partial windings are now supplied in six different conducting phases in accordance with the sensor information and the current and voltage curves are block-shaped.
The switching position of each electronic commutation is offset by 30° from the respective torque maximum, and all this gives a torque ripple of 14 per cent and allows for high starting torques and accelerations. These brushless motors are ideal for highly dynamic servo drives, start/stop operation and positioning tasks.
The sensorless block commutation has a rotor position determined through the progression of the induced voltage. Electronic evaluation of the zero crossing of the induced voltage (EMF) then commutes the motor current after a speed-dependent pause.
Because the amplitude of the induced voltage is dependent on the speed, when stalled or at a low speed the voltage signal is too small and the zero crossing cannot be detected accurately. Special algorithms are required for starting and to allow EC motors to be commuted without sensors in a D arrangement, a virtual star point is created in the electronics.
These brushless motors are ideal for continuous operation at high speeds and in use within fans.
More from this supplier | More from this category: Motors, controls and Drives
More from this subcategory: DC Motors