JPS6229755U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of a small electric motor according to the present invention, Fig. 2 is a sectional view taken along the line - in Fig. 1, and Fig. 3 shows the same embodiment with the sensor removed. 4 is a left side view of the above embodiment, FIG. 5 is a right side view of the above, FIG. 6 is a front view of the same, FIG. 7 is a rear view of the above, and FIG. 8 is a bottom view of the above, FIG. 9 is a plan view showing the encoder disk used in the above embodiment, FIG. 10 is a plan view showing another example of the encoder disk that can be used in the present invention, and FIG. 11 is a plan view showing the encoder disk used in the above embodiment. FIG. 12 is a circuit diagram showing an example of a detection circuit that can be used in the present invention; FIG. 13 is a plan view showing a portion of the stator frame in the above embodiment; FIG. 14 15 is a bottom view of the same sensor holder, and FIG. 16 is a plan view showing a part of another example of the stator frame applicable to the present invention. 17 is a plan view showing still another example of the stator frame, FIG. 18 is a plan view showing a part of another example of the encoder disk that can be used in the present invention, and FIG. 19 is a plan view showing still another example of the encoder disk. 20 is a waveform diagram of a signal obtained using the same encoder disk, and FIG. 21 is a timing chart showing the relationship between the rotor magnet, disk, and detection signal in the embodiment of the present invention. 22 is a conventional timing chart showing the above relationship, FIG. 23 is a plan view for explaining the drive timing in an embodiment of the present invention, and FIG. 24 is a sensor mounting part and sensor holder applicable to the present invention. FIG. 25 is a plan view showing another example of the conventional sensor mounting portion and encoder disk. 18...shaft, 20...rotor, 21, 44, 45
...Encoder disk, 14a...Sensor mounting part, 14e, 14f...Curved side, 11e, 41b, 4
6...Sensor mounting part.

Amendment November 21, 1980 The brief description of the drawing is amended as follows. "No. 19" in line 17 of page 22 of the specification has been changed to "Fig. 19.""22nd" in the 2nd line of page 23 of the specification is replaced with "2nd"
2).

Claims (1)

[Scope of utility model registration request] A small electric motor in which an encoder disk is attached to the axial side of the rotor so that it rotates integrally with the rotor's magnetic poles in a certain relationship, and a sensor for detecting the signal on the disk is attached to a fixed member such as the motor case. A small electric motor characterized in that at least one side of the sensor mounting portion of the fixing member is curved in the same direction as the arc formed by the rotor.