JPS6152146A - Motor - Google Patents

Abstract

PURPOSE:To omit the phase regulating work of an induced voltage and the position detection signal of a rotor by forming a rotor magnet and a magnet for a sensor magnet of the same magnet, and coupling pole fittings for a sensor with a magnet end. CONSTITUTION:When a current is flowed through a control circuit to a winding 30 of a stator core 27, an electromagnetic force is operated to a rotor to cause the rotor to rotate, but the position of a magnetic sensor 40 is secured to the winding 30 and through a stationary side cover 29 to a position predetermined in the correlation, and a current is flowed to the winding 30 when the induced voltage by a rotor magnet 32 becomes maximum. In this case, the rotor magnet and the magnet for the sensor are formed of the same magnet 32, and the sensors 40 are disposed at the prescribed correlation position with the winding position of the stator 26. Accordingly, the work of regulating the phases of the induced voltage and the position detection signal of the rotor can be omitted.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an electric motor.

The structure of the conventional example and its problems In the conventional electric motor which employs a permanent magnet in the rotor and has a mechanism for detecting the position of the rotor, the structure shown in FIGS.
A mechanism as shown in the figure is used. In other words, in the electric motor having the structure shown in FIG. 5, the rotor, which is held in the rotor with a gap between it and the stator 3, is fixed to the outer periphery of the shaft 1 through a locking key 23, as shown in FIG. Magnetic yoke 7
Insert the key groove 7 provided on the outer periphery of the yoke 7.
A is engaged with the rotor core 22, and the rotor magnet 2 is connected between the core 22.
At the same time, the rotor fixing bracket 8 and rotor fixing bracket 9 made of non-magnetic material are placed at both ends in the axial direction, and the through bolt 10 is passed through the rotor 0 rotor, which is integrally fixed by the nut L1.12. The fixing fitting 9 constitutes a rotor together with the rotor fixing fitting 8, and at the same time, a position detection sensor magnet 14 (FIG. 7) is integrally coupled with a magnetic sensor magnet yoke 13 sandwiched therebetween. Position detection sensor magnet 1
A magnetic sensor 15 is held on the stator side, facing the magnetic sensor 4 in the axial direction with a gap therebetween. A plurality of magnetic sensors 15 are arranged at equal intervals on the circumference, and a magnetic sensor yoke 16
It is fixed to the stator side cover 24 via. Further, the stator side cover 24 is adjusted to move relative to the core cover 5 integrally connected to the stator core 3 in the rotational direction.
is fixed. In addition, 4 is the fixing bolt, 19.20
is a bearing.

The operation in the above structure is as follows:
When the rotor is energized through a control circuit (not shown), an electromagnetic force acts between the rotor and the rotor, causing the rotor to rotate. In this case, it is necessary to energize the winding 6 when the induced voltage due to the magnetic force of the rotor magnet 21 is at its maximum.
For this purpose, the position of the magnetic sensor 15 is adjusted so that the time when the magnetic flux generated by the sensor magnet 14 is detected by the magnetic sensor 15 coincides with the time when the induced voltage generated by the rotor magnet 21 reaches its maximum. .

However, in this structure, the rotor magnet 21 and the sensor magnet 14 are arranged separately, and the polarities of their magnetic poles are shifted due to variations. It is necessary to adjust the position of In addition, the rotor magnet 21 and the sensor magnet 1
4 are arranged separately, which has the disadvantage of being long in the axial direction.

Purpose of the Invention In view of the above drawbacks, an object of the present invention is to provide an electric motor that can omit the work of adjusting the phase of the induced voltage and the rotor position detection signal, and can shorten the axial length. There is.

Composition of the Invention This invention connects a plurality of rotor cores to the outer periphery of a shaft portion so as to engage with each other in the rotational direction, and holds permanent magnets between the rotor cores, and furthermore, the rotor cores and the permanent magnets are connected in the axial direction. A support member is brought into contact with one end, a sensor magnetic pole member is brought into contact with the other end, and the sensor magnetic pole member is held in the axial direction by a port, and the sensor magnetic pole member has a portion corresponding to the rotor core made of a magnetic material, and the permanent A rotor in which the corresponding part of the magnet is made of a non-magnetic material and the magnetic material is separated by a non-magnetic material, a stator core that faces the rotor core in a radial direction, a coil that excites the stator core, and a coil for the sensor. and a stator having a magnetic sensor for position detection that faces the magnetic pole member in the axial direction, and the magnetic sensor detects the magnetism appearing in the magnetic body of the magnetic pole member for the sensor. No need for a sensor magnet, and by placing the magnetic sensor in a certain correlated position on the stator winding position, the work of adjusting the phase of the induced voltage and rotor position detection signal can be omitted, and at the same time it is structurally This can be expected to have the effect of reducing the axial length by four.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 4. In FIG. 1, a non-magnetic yoke 35 is inserted into the outer periphery of the shaft 25 of the rotor 43 via a detent key 36, and the rotor core 31 is further inserted into a keyway 35a provided on the outer periphery of the yoke 35. A rotor magnet 32 is held between rotor cores 31, and at the same time, non-magnetic rotor fixing fittings 42 and sensor magnetic pole fittings 39 are brought into contact with both ends in the axial direction and are integrally clamped and fixed by through bolts 33. .

As shown in FIGS. 3 and 4, the magnetic pole fitting 39 for the sensor consists of a non-magnetic member 39' at the position and center of the magnet 32, and a magnetic body 39# at the corresponding position of the rotor core 31, The magnetic body 39'' is integrally coupled with the magnetic body 39'' separated by a non-magnetic member 39'.A magnetic sensor 40 faces the sensor magnetic pole fitting 39 with a gap in the axial direction and is held on the stator side. The magnetic sensors 4o are composed of Hall elements, and are arranged at equal intervals on the circumference, and are fixed to the stator side cover 29 via a ring-shaped magnetic sensor yoke 41. The magnetic flux generated by the child magnet 32 is distributed between the rotor core 3I and the air gap G.

The magnetic material 3 flows between the rotor core 31 and the yoke 41 that opposes the axial direction through the gap G2.
The magnetic pole appearing at 9'' is the same as the rotor core. Therefore, the magnetic sensor detects the magnetic pole of the magnetic body 39'' of the sensor magnetic pole fitting 39. In addition, 2G is a stator, 28
is a fixing bolt, 29 is a core cover, 34 is a tightening nut,
37.38 are bearings.

To explain the operation of the above structure, when the winding 30 of the stator core 27 is energized through a control circuit (not shown), an electromagnetic force acts between it and the rotor, causing the rotor to rotate. The position of the magnetic sensor 40 is fixed in a predetermined position with a correlation between the winding 30 of the stator core 27 and the fixed side cover 29, and when the voltage induced by the rotor magnet 32 is at its maximum, The winding 30 will be energized. In this case, the magnetic sensor 40 detects the position of the rotor and detects the timing of energizing the winding 30 so that the winding 30 is energized under the best conditions. In this way, by configuring the rotor magnet and the sensor magnet with the same magnet, it is possible to eliminate the work of arranging the magnetic sensor 40 in advance at a position correlated with the winding position of the stator, and at the same time, the rotor magnet By configuring the sensor magnet and the sensor magnet with the same magnet, the axial length can be structurally shortened.

Effects of the Invention As described above, in the electric motor of the present invention, the rotor magnet and the sensor magnet are the same magnet, and the sensor magnetic pole fitting is coupled to the end of the magnet, thereby creating a permanent magnet, a sensor magnetic pole member,
Since an axial magnetic circuit consisting of a magnetic sensor and a yoke for the magnetic sensor is formed, it is possible to omit the phase adjustment work of the induced voltage and the rotor position detection signal, and the axial length can be shortened structurally. Its practical effects are significant.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a partial side view of the rotor, Fig. 3 is a front view of the rotor on the sensor magnetic pole fitting side, and Fig. 4 is a perspective view of the sensor magnetic pole fitting. 5 is a cross-sectional view of a conventional example, FIG. 6 is a cross-sectional view of its rotor, and FIG. 7 is a front view of a sensor magnet. 25... Shaft, 26... Stator, 27... Stator core, 30... Winding (coil), 31... Rotor core, 32... Rotor magnet (permanent magnet) , 33... Bolt, 39... Sensor magnetic pole fitting (member), 39'
...Non-magnetic material, 39#...Magnetic material, 4o...Magnetic sensor, 43...Rotor Fig. 3 Fig. 4 Fig. 5

Claims (2)

[Claims] (1) A plurality of rotor cores are coupled to the outer periphery of the shaft portion so as to engage with each other in the rotational direction, and a permanent magnet is held between the rotor cores, and one end of the rotor core and the permanent magnet in the axial direction is A support member is brought into contact with the sensor magnetic pole member and the other end thereof is brought into contact with the sensor magnetic pole member and held in the axial direction by bolts, and the sensor magnetic pole member has a portion corresponding to the rotor core as a magnetic material and a corresponding portion of the permanent magnet. a rotor in which a magnetic material is separated by a non-magnetic material, a stator core that faces the rotor core in the radial direction, a coil that excites the stator core, and the sensor magnetic pole member. and a stator having a magnetic sensor for position detection facing each other in the axial direction, the magnetic sensor detecting magnetism appearing in the magnetic body of the magnetic pole member for the sensor. (2) The electric motor according to claim (1), wherein the magnetic sensor is a Hall element.