Motors are built from a Rotor, Windings and Driving Electronics. Our MotorCell takes it a step further, integrating everything into a single, ultra-compact module. Its the smallest coreless high-speed motor, with planar PCB windings and built-in sensorless control, eliminating the need for extra sensors!
Designed for low-torque, high-speed applications, it supports speed control via PWM and integrates seamlessly with the MotorCell library, offering prebuilt PID control for CodeCell and other ESP32 devices. The MotorCell utilize the BD67173NUX chip as its three-phase back-EMF controller with a sensorless drive system, eliminating the need for a Hall sensor. Its speed can be controlled in 1,000 RPM increments (with the MotorCell PID library) via a PWM input signal, with the IN pin defaulting to low and turning the motor to full speed when pulled high (2.5-5V). If the motor is forced to stop, it enters a 5-second lock protection mode, which can be bypassed by resetting the PWM input to 0% and back on, a feature automatically handled by the library's Spin function.
Its innovative shaftless pancake design, is made with a slim 3.3mm aluminum rotor, allows direct part attachment to the rotor's teeth. This rotor houses the four arc-magnets, an iron back-plate, and ceramic-hybrid ball bearings, which spins up to 30,000 RPM (no-load), perfect for fans, robotics, DIY crafts, and art projects.
For custom designs, the open stator can be integrated into a PCB, with rotor components added separately for a compact and robust solution.
The box will include the MotorCell, a 5-pin connector, and a set of four M1.2 screws. The PCB is ROHS Compliant & follows IPC 6012 Class 3 standard. Also, please note that the MotorCell is intended to be used as a DIY maker kit. For commercial purposes, please get in touch.
Some other notes:
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This motor is intended to drive small loads. The speed will decrease as the load/drag increases. The maximum spinning load is 12g at a radius of 18mm. Check the specifications for the full torque vs speed graph.
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Caution: This motor operates at high speeds. Keep hands away from moving parts and wear protective eyewear to prevent injury.
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Keep in mind that the library automatically activates a pull-up resistor on the OUT pin for reading the speed value. If you're using other controllers with the MotorCell library, ensure the internal pull-up remains enabled or add an external one.
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If you ever need to disassemble the motor, handle it with care when unbolting the shaft. The motor contains small, precision-machined parts that are easy to lose. It is recommended to torque the shaft to 0.15 Nm during reassembly. When soldering wires or connectors to the PCB, be cautious as the soldering iron may be drawn towards the motor's magnets.
- To install press-fit 3D-printed parts, we recommend an inner diameter of 16.4mm - 16.6mm, which depends on your 3D printer's tolerance. Once printed, just press your part into the rotor's teeth to keep it secure. Superglue can also be added to the rotor's teeth to secure the part. Make sure the glue is only applied to the sides, and doesn't enter near the MotorCell's bearing.
