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Slotless motors are designed to optimize smoothness and create predictable torque output with minimal non-linear effects. Commonly referred to as slotless motors when rotary and air core motors when linear, slotless motor designs place only copper phase coils in the air gap of the motor.
Slotted motors have copper wires wound through slots that keep the motor’s rotor turning when energized. As the rotor’s magnet passes these slots (also known as teeth), there is a greater attraction to the iron at the ends of the slots than to the air gaps between them.
This causes an uneven magnetic pull known as cogging. As a motor slows, cogging increases as the magnet “snaps” from one iron segment to the next. This motion can also create torque ripple—a loss in efficiency, vibration and noise.
Slotless motors have no air gaps since there are no slots, and therefore have a continuous back iron geometry. This eliminates cogging, so the motors run smoother at all speeds but most noticeably at slower speeds where slotted motors magnify cogging.
Any application needing a motor turning slower than 500 rpm would likely benefit from using a slotless motor.
Slotless motors also create less electromagnetic interference, allowing for high speeds and quick accelerations. Engineers discovered that if a slotless motor is designed to have a sinusoidal torque output that produces negligible distortion (over trapezoidal voltage output)
The Global Slotless Motors Market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
22ECP35 Ultra EC Slotless Brushless DC Motor – The ECP line of miniature motors are ultra cost optimized without compromising on premium performance. The two pole 22ECP35 brushless motor provides high continuous and peak torques and 100% more power over similar comparative motors while maintaining smooth operation and long life.
With the 22ECP35, the user can get the right balance between torque and speed in a compact short length. Even better, is the 22ECP35’s adaptability for most applications in the medical & industrial markets, enhancing life and reliability
