JPS62149310U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a brush micromotor, Figure 2
The figure is a perspective view of a yoke with a conventional coolant passage, Figure 3 is a developed view of Figure 2, and Figure 4 is Figure 3C.
₁ -C A cutaway view taken along the line ₁ , Figures 5A to 5D are diagrams showing changes in magnetic flux distribution as the rotor magnet rotates, Figure 6 is a perspective view of the yoke showing the principle configuration of this invention, and Figure 7 is a developed view of Fig. 6, and Fig. 8 is a developed view of Fig. 7 C ₂ -C
_2- line arrow cutaway view, Figure 9 is an enlarged view of the main part of Figure 7,
Fig. 10 is a cross-sectional view of the main part of the handpiece body showing an embodiment of this invention, Fig. 11 is a cross-sectional view of the built-in part of the micromotor showing the existence of a coolant passage, and Fig. 12 a and b are the same yoke. FIG. 7 is an explanatory diagram showing another configuration in which coolant passages are provided on the outer peripheral surface. (Explanation of symbols), 1... Coolant passage, 2... Yoke, 3... Handpiece body frame, 4...
Micro motor, 9... Coolant pipe, 10...
Handpiece body.

Claims (1)

[Claims for Utility Model Registration] 1. A medical handpiece with a built-in brushless micromotor, comprising: a coolant passage connecting both ends of the yoke on the outer peripheral surface of the yoke of the brushless micromotor fixed to the handpiece body frame; A medical handpiece consisting of a plurality of pieces arranged in a helical direction around a yoke wound within an angle range defined by the following formula. θ=360°N×M, 1≦M≦N-1 (However, θ: Setting angle, N: Number of multiple passages, M
:Positive integer). 2. A utility model according to claim 1, wherein a plurality of coolant passages connecting both ends of the yoke are arranged on the outer circumferential surface of the yoke in a spiral direction in which the yoke is wound in an angular range expressed by the following formula. Medical handpiece. θ=360°N (where θ: set angle, N: number of passages) 3. A utility model registration claim in which the passages are equally distributed in the same direction and wound in the same direction on the outer peripheral surface of the yoke. A medical handpiece according to scope 1. 4. The medical handpiece according to claim 1, wherein a plurality of the passages are arranged with their starting ends or terminal ends connected and wound in opposite directions. 5. The medical handpiece according to any one of claims 1 to 4, wherein the passage is carved on the outer peripheral surface of the yoke.