JPS6089778U - brushless motor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the main parts of a disc-type brushless motor as an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of Fig. 1, and Figs. 3 and 4 are a field magnet for coking generation. Magnet setting position An explanatory diagram of the arrangement position of the stop magnet, Fig. 5 is a torque curve of a disc type brushless smoke, Fig. 6 is an explanatory diagram showing the relationship between the field magnet and the position detection coil,
Fig. 7 is an energization control circuit as an embodiment, Fig. 8 is a developed view of a field magnet, position detection coil, and drive coil, and the energization control circuit, and Figs. 9 and 10 are explanatory diagrams of the principle of the present invention. , Fig. 11 is an explanatory diagram of other arrangement positions of the field magnet setting position and stopping magnet for coking generation, and Fig. 12 is a developed view of the 6-pole field magnet, position detection coil, and drive coil, and energization. It is a control circuit. L□...Position detection coil, L...Bending drive coil, 11.11'...Magnet for setting and stopping position of field magnet for generating bending coking.

Claims (1)

[Claims for Utility Model Registration] The field magnet is provided with a 2P (p is a positive integer of 1 or more) pole field magnet having alternating IN and S magnetic poles as a rotor, and the above-mentioned field for rotationally driving the rotor. A drive coil is provided on the fixed side facing the magnetic magnet, and a position detection coil is provided facing the field magnet and generates an electromotive force by rotation of the field magnet, and the reconnaissance detection coil is connected to the drive coil. The drive coil is arranged at a position in phase with the coil, and uses the electromotive force obtained by the position detection coil to supply current in an appropriate direction, thereby rotating the field magnet in a predetermined direction. An energization control circuit is provided, and the area extends from the conductor part contributing to the torque generated by the drive coil or the conductor part contributing to the electromotive force generation of the position detection coil to one third of the magnetic pole in the rotation direction of the field magnet. A brushless motor characterized in that a magnet for coking generation and for stopping the field magnet setting position is provided at a fixed side position facing the field magnet at the position or under conditions equivalent to the position. 2. The above-mentioned coking generation and field magnet setting position stop magnet is arranged in the direction of rotation of the field magnet from the conductor part contributing to the torque generated by the armature coil or the conductor part contributing to the electromotive force generation of the position detection coil. The brushless motor according to claim 1, wherein the brushless motor is provided at a fixed side position facing the field magnet about one-fourth of the magnetic pole in front of the field magnet. 3. The brushless motor according to claim 1 or 2, wherein the drive coil and the position detection coil are ironless core type air-core coils formed in a frame shape. 4. Any one of claims 1 to 3 of the utility model registration claim, characterized in that the drive coil and the position detection coil are arranged 180 degrees symmetrically on a fixed side facing the field magnet. Brushless motor described in the above. 5 The drive coils arranged 180 degrees symmetrically,
The snow detection coil and the energization control circuit are connected to a negative power supply side of a terminal of a conductor portion facing one magnetic pole of the field magnet of the position detection coil, and are connected to one side of the field magnet of the drive coil. Connecting the terminal of the conductor portion facing the magnetic pole to the collector side of the NPN transistor, and connecting the base side of the transistor to the terminal of the conductor portion facing the other magnetic pole of the field magnet of the position detection coil; The emitter of the transistor is connected to the negative power supply side, the other terminal of the conductor portion of the drive coil facing the other magnetic pole of the field magnet is connected to the positive power supply side, and the other terminal of the conductor portion of the drive coil facing the other magnetic pole of the field magnet is connected to Connect a resistor between the terminals of the opposing conductor parts and the base of the transistor,
5. A brushless motor according to any one of claims 1 to 4, characterized in that the brushless motor is constructed by connecting a diode between the base and emitter of the transistor. 6. Utility model registration, wherein the brushless motor is a disc-type brushless motor. 6. The brushless motor according to any one of claims 1 to 5.