A brushless motor with built-in sensors

By replacing the external magnetic encoder with a built-in linear Hall circuit board and Hall sensor, combined with a through-path wiring channel and mechanical limiting structure, the problems of large size and non-compact structure of hollow shaft brushless motors are solved, and the miniaturization and stable operation of the motor are achieved.

CN122371623APending Publication Date: 2026-07-10SHENZHEN KECHUANGXING MOTOR TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN KECHUANGXING MOTOR TECH CO LTD
Filing Date
2026-04-24
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing hollow shaft brushless motors use an external magnetic encoder in conjunction with a ring magnet for rotor position detection, resulting in a large overall size, insufficient compact structure, and complex system integration, making it difficult to meet the requirements for miniaturization and lightweighting.

Method used

The rotor position is detected by a built-in linear Hall circuit board and a small linear Hall sensor and permanent magnet, replacing the external magnetic encoder. The hollow shaft, base opening, rotor housing opening and Hall circuit board clearance form a through wiring channel. The double bearing and partition components constrain the hollow shaft wobbling, and the static limit block and dynamic limit block realize mechanical hard limit.

Benefits of technology

Significantly reduces the overall size of the motor, improves structural compactness, adapts to space-constrained scenarios, avoids cable tangling, enhances operational stability and service life, and improves angle control accuracy.

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Abstract

This application discloses a brushless motor with built-in sensors, comprising: a stator assembly, the stator assembly including a base, a bushing, and a stator core, the bushing being mounted on the base, the base having a lower opening communicating with the bushing, and the stator core being sleeved on the bushing and having windings; and a rotor assembly, the rotor assembly including a hollow shaft, a magnetic ring, and a rotor housing, one end of the hollow shaft being rotatably inserted into the inside of the bushing, the rotor housing being mounted on the end of the hollow shaft away from the bushing, the magnetic ring being mounted on the inner sidewall of the rotor housing, and the stator core being located inside the magnetic ring and opposite to the magnetic ring. This type of brushless motor with built-in sensors uses a built-in linear Hall circuit board to replace an external magnetic encoder, and uses a linear Hall sensor and a permanent magnet to detect the rotor position, reducing the overall size of the motor, improving structural compactness, and effectively adapting to space-constrained application scenarios with upper and lower openings.
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