If you're modifying an electric bicycle, you may have come across Hall cables mentioned in relation to hub motors. But what exactly are they, and why are they vital components? This article will provide an in-depth explanation of Hall cables and their function.
Also known as Hall effect sensors, these electronic devices utilize the Hall effect principle to measure magnet position. Invented by Edwin Hall, they detect magnetic fields and convert that information into a readable output - making them well-suited for numerous sensing applications.
Within a hub motor, Hall cables precisely track the rotating rotor location. By extension, they allow determination of the motor's phase for efficient commutation control. Hall sensors are usually centrally placed near the motor core and hardwired to the motor controller.
Each Hall cable contains a thin strip or plate that conducts an electric current. When a nearby magnet passes by, its magnetic field modifies the current flow - generating a voltage detectable by the controller. This voltage pulse identifies the magnet and rotor's angular position.
Accurate tracking of the rotor phase via Hall cables enables optimized power delivery from the controller at exactly the right times. This produces smooth, regulated torque as needed for starting, accelerating, braking and coasting. Without such nimble power adjustments, the motor could not perform efficiently or last as long.
In summary, Hall effect sensors play an indispensable role in hub motors by continuously measuring rotor position down to minute fractions of a degree. Their real-time tracking allows precise commutation for reliable, durable power assistance from electric bikes and vehicles. Without Hall cables, hub motors would lack functional precision.
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