Cogging Type Ironless Brushless DC Motor

Abstract

Provided is a tooth groove type iron-core-free brushless direct-current motor. The tooth groove type iron-core-free brushless direct-current motor is composed of an aluminum alloy shell, a step type rotor shaft, a clamped internal rotor, a cup type rotor, a plastic end cover and a tooth groove type armature coil. Compared with a hollow cup coil of an existing iron-core-free direct-current motor, a coil framework of the tooth groove type armature coil is arranged outside, a coil body is located inside, appearance precision is high, the coil body is provided with a protection sheath, therefore, the coil body is not likely to be damaged, and the tooth groove type armature coil is high in mounting mechanical strength and good in reliability. The specific value of the effective areas of six single-coil cutting magnetic lines of the tooth groove type armature coil is large, iron core losses are avoided, and line losses are small. The tooth groove type armature coil is formed by winding a plurality of strands of varnished wires in parallel, the process is simple, flexible and reliable, the framework space utilization rate is high, and when three phases of coils carry out groove-striding line connecting, the varnished wires become flat wire striding wires, and framework space is saved. The structural strength of an internal permanent magnet ring of the clamped internal rotor is enhanced through a left conical clamp and a right conical clamp, and internal permanent magnet ring looseness caused by centrifugal force generated during high-speed rotation of the rotor is effectively overcome.

Description

technical field [0001] The invention relates to an iron-core-less brushless direct-current motor, in particular to a tooth-groove type iron-less brushless direct-current motor. Background technique [0002] At present, there is a kind of coreless DC motor called "coreless DC motor" on the market. The "coreless" is an armature coil wound with enameled wire on a cylindrical frame. The "coreless" of the brushed motor is the rotor. Coil, the "coreless cup" of a brushless motor is a stator coil. For example, the patent number is: "2010206861514" and the name is "Inner and Outer Rotor Brushless DC Motor without Iron Core Loss", which is a "coreless" without core loss. For brushless DC motors with stator coils, the technology of "coreless" coils has matured and is the core technology for shaping ironless DC motors. However, the existing "coreless" coils are not perfect. The disadvantages are: 1. "Hollow" The frame of the "cup" coil is inside and the coil is outside, so the process...

AI Technical Summary

Problems solved by technology

[0002] At present, there is a kind of coreless DC motor called "coreless DC motor" on the market. The "coreless" is an armature coil wound with enameled wire on a cylindrical frame. The "coreless" of the brushed motor is the rotor. Coil, the "coreless cup" of a brushless motor is a stator coil. For example, the patent number is: "2010206861514" and the name is "Inner and Outer Rotor Brushless DC Motor without Iron Core Loss", which is a "coreless" without core loss. For brushless DC motors with stator coils, the technology of "coreless" coils has matured and is the core technology for shaping ironless DC motors. However, the existing "coreless" coils are not perfect. The disadvantages are: 1. "Hollow" "Cup" bobbin is inside and coil is outside, the process is complex and the shape accuracy is poor

2. The coil is easy to be injured without a protective jacket, and the mechanical strength of the "coreless" coil is fragile and poor in reliability.

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