JP2516479Y2 - DC brushless motor with detector - Google Patents

Description

[Detailed Description of the Invention] a. Industrial field of application The present invention relates to a DC brushless motor with a detector, and more particularly, to a rotation detector for a brushless motor body in a state where an accurate reference position signal can be obtained. The present invention relates to a new improvement that is configured so that the rotation detector and the brushless motor main body can be attached and detached extremely easily.

b. Conventional Technology There are various types of DC brushless motors with a detector that have been used in the past, and a typical configuration among them will be described by the applicant shown in FIGS. 5 and 6. The structure manufactured in-house can be disclosed.

That is, the reference numeral 1 in the drawing is a brushless motor main body, and the brushless motor main body 1
The rear lid 2 is provided with a rotation detector 4 such as an encoder or a resolver via a mounting spring 3.

A hollow detection rotary shaft 5 provided in the rotation detector 4.
The motor rotating shaft 6 of the brushless motor body 1 is fitted and coupled to the three spring pieces 3a, 3b, 3c formed on the mounting spring 3 are long holes formed in each of them. It is detachably attached to the rear lid 2 via a mounting screw 8 provided on the rear cover 7.

The conventional DC brushless motor with a detector is configured as described above, and each drive coil of the brushless motor main body 1 (for example, U, V, and W phases, which is well known in the art, according to the switching signal obtained from the rotation detector 4 is used. Phase change of a motor (not shown) and rotation of the motor rotation shaft 6 via a rotor (not shown).

Further, the rotation detector 4 is connected to the brushless motor main body 1
When mounting on, the mounting screw 8 is mounted in each long hole 7 of each spring piece 3a, 3b, 3c of the mounting spring 3 and the output of the rotation detector 4 becomes zero or the reference position signal is generated via the measuring instrument. The position of the zero point or reference position and the rotation reference position of the motor rotation shaft 6 (a predetermined magnetic pole position with respect to the stator of the rotor) are aligned.

Therefore, after the above-mentioned alignment is completed, the assembly and assembly of the brushless motor main body 1 and the rotation detector 4 is completed by fastening the mounting screws 8.

c. Problems to be Solved by the Invention Since the conventional DC brushless motor with a detector was configured as follows, it had the following problems.

In other words, when connecting the brushless motor body and the rotation detector, the fixed side of the rotation detector was adjusted in position, so it can be combined when manufactured on the factory production line, but once delivered, When the user attaches to various equipment such as a robot and the rotation detector fails and needs to be replaced, remove the brushless motor body from the equipment and use the electrical measuring instrument to adjust the zero position of the rotation detector. Alternatively, it was necessary to perform the coupling and assembling work while searching for the reference position.

The present invention has been made to solve the above problems, and in particular, a rotation detector can be easily coupled to a brushless motor body in a state where an accurate reference position signal can be obtained, and An object of the present invention is to provide a DC brushless motor with a detector, which makes it extremely easy to attach and detach the main body and the rotation detector.

d. Means for Solving the Problems The DC brushless motor with a detector according to the present invention uses a switching signal for switching the driving signals to a plurality of driving coils.
In a DC brushless motor with a detector obtained from a rotation detector connected to a motor rotation shaft of a brushless motor body, a protruding first locking portion formed on the motor rotation shaft and a rotation detector of the rotation detector. A mounting spring that is formed on a hollow detection rotation shaft and that engages with the first locking portion and that includes a second locking portion that is a key groove, and a plurality of spring pieces that are provided in the rotation detector and that have elongated holes. A positioning elongated hole formed only in one of the spring pieces and located inside the elongated hole; and a plurality of attachments provided in the mounting spring and located inside the elongated positioning hole. An elongated hole and a pin that is provided on the brushless motor main body and that engages with the positioning elongated hole are provided. The positioning elongated hole has a width substantially the same as the width of the pin and is arranged in the radial direction of the rotation detector. To have a gap The rotation detector is detachably attached to the brushless motor main body through the locking portions, the positioning long holes, and the pins, and the second locking portion and the positioning The long holes are configured so as to be positioned so as to coincide with each other in the radial direction.

e. Operation In the DC brushless motor with detector according to the present invention, the first locking portion formed on the motor rotation shaft of the brushless motor body and the second locking portion formed on the detection rotation shaft of the rotation detector.
Since the motor rotation shaft and the detection rotation shaft are connected via the locking portion, the alignment of each rotation shaft in the rotation direction can be completely obtained.

Further, the positioning of the rotation detector and the brushless motor main body can be perfectly achieved by coupling the positioning long hole formed in the attachment spring of the rotation detector and the pin formed in the brushless motor main body.

Therefore, the detection rotation shaft of the rotation detector, the second locking portion formed on the mounting spring, and the pin are designed in advance to be at the zero point position or the reference position. The brushless motor body and the rotation detector detect the predetermined magnetic pole position of the rotor of the brushless motor based on the switching signal from the rotation detector so that the rotation can be performed as designed by simply matching the holes with the pins. Not only at the time of manufacturing, but also when replacing the rotation detector during maintenance, it is possible to always perform assembly and assembly with the same accuracy as during manufacturing, without the need for any measuring instruments. The replacement work during maintenance can be extremely simplified.

f. Embodiment Hereinafter, a preferred embodiment of the DC brushless motor with a detector according to the present invention will be described in detail with reference to the drawings.

The same or equivalent parts as those of the conventional example will be described using the same reference numerals.

1 to 4 show an embodiment of the present invention. FIG. 1 is a front view showing a rotation detector, FIG. 2 is a rear view showing a back surface of a brushless motor main body, and FIG. FIG. 4 is a sectional view showing the entire structure, and FIG. 4 is a sectional view showing an example of a rotation detector.

In the figure, reference numeral 1 is a brushless motor main body. In the brushless motor main body 1, a stator 11 having drive coils 10 of a plurality of phases (for example, U, V, W), a pair of bearings 12, A rotary shaft 6 is rotatably provided by 13 and has a rotor 14.

On the rear lid 2 of the brushless motor body 1, a rotation detector 4 composed of an encoder is provided via a mounting spring 3.

A hollow detection rotary shaft 5 provided in the rotation detector 4.
The motor rotating shaft 6 of the brushless motor main body 1 is fitted and coupled to the first rotating portion 6 and the first locking portion 20 formed of a protruding pin formed on the motor rotating shaft 6 detects a hollow shape. It is detachably engaged with a second locking portion 21 formed on the rotary shaft 5 and formed of a key groove.

Further, the plate-shaped mounting spring 3 mounted on the front surface 4a of the rotation detector 4 via the mounting elongated hole 3A and the bolt 3B has the elongated hole 7 located outside the mounting elongated hole 3A. The spring pieces 3a, 3b, 3c are radially formed, and only one of the spring pieces 3a, 3b, 3c has a radial direction (indicated by a dotted line in FIG. 1). (Position) which is a long hole formed in the shape of a long hole, and is positioned inside the long hole 7 and outside the attachment long hole 3A. A pin 23, which is a pin formed in the axial direction of the motor rotating shaft 6, is fitted and engaged. In the drawings, as shown in FIGS. 1 and 2, they are in a non-bonded state.

The width of the positioning long hole 22 has the width of the pin 23.
The width is substantially the same as the width of No. 1 and is formed so that there is no play in the rotational direction, and is formed in the longitudinal direction so as to have a gap in the radial direction (the position shown by the dotted line in FIG. 1).

Each of the long holes 7 formed in the mounting spring 3 is formed by joining the mounting spring 3 to the rear lid 2 and then mounting screws 8 penetrating the long hole 7 into three screw holes of the rear lid 2. The rotation detector 4 is detachably provided on the rear lid 2 of the brushless motor body 1 by being screwed onto the 24.

Therefore, in this case, the first locking portion of the motor rotating shaft 6
20 is formed according to a predetermined magnetic pole position of the rotor 14,
Moreover, the pin 23 is also formed so as to coincide with the predetermined position of the rear lid 2 (that is, the second locking portion).
21 and the positioning long hole 22 are positioned so as to coincide with each other in the radial direction), the second locking portion 21 and the positioning long hole 22.
Also, since the switching signal generated from the rotation detector 4 is formed at a zero point position (a position where the output becomes zero) or a reference position (a reference position signal is generated), the position is designed in advance. By mounting the rotation detector 4 on the rear lid 2 of the brushless motor main body 1, the first locking portion 20, the second locking portion 21, the positioning long hole 22 and the pin 23 are engaged and coupled with each other, and the brushless The motor body 1 is configured to be able to rotate accurately according to a switching signal (not shown) obtained from the rotation detector 4.

Further, the rotation detector 4 is configured as shown in FIG. 4, and the detection rotation shaft 5 is hollow and is rotatably provided on the base 31 via the bearing 30. 5 is provided with a rotary slit plate 32 having a large number of slits (not shown) which are signal patterns.

A circuit board 35 having a light emitting portion 33 and a signal processing circuit portion 34 is provided in the vicinity of the rotary slit plate 32, and a light receiver 36 is provided in the base 31 in the vicinity of the rotary slit plate 32. By the rotation of the detection rotary shaft 5, a switching signal including the reference position signal is output from the signal processing circuit section 34 to the light receiving section.
As can be obtained from 36, the first attachment locking portion 22 of the attachment spring 3
The relative positions of the light receiving part 36, the rotary slit plate 32 and the detection rotary shaft 5 are designed in advance.

Since the DC brushless motor with a detector according to the present invention is configured as described above, for example, when the rotation detector 4 is defective and needs to be replaced, the defective rotation detector 4 is replaced with a good product. The first locking portion 20 and the second locking portion 21 are coupled so as to be coupled to each other to couple the motor rotating shaft 6 and the detecting portion rotating shaft 5 so that the positioning elongated hole 22 and the pin 23 are engaged with each other. By attaching the mounting spring 3 to the rear lid 2 of the brushless motor main body 1 in combination with the above, the reference position or zero point position of a predetermined switching signal can be set to the rotor without any adjustment.
The rotation detector 4 and the brushless motor body 1 can be easily coupled so as to match the predetermined magnetic pole positions of 14.

The locking portions 20 and 21 in this embodiment are not limited to the configuration of the pin and the key groove as described above, but other well-known structures such as a key and the key groove can be used.

Further, the rotation detector 4 is not limited to an encoder, and a known resolver using a winding wire may be used. Even when a rotary shaft is used, the same effect can be obtained.

g. Effect of the Invention Since the DC brushless motor with a detector according to the present invention is configured as described above, the following effects can be obtained.

That is, the motor rotation shaft and the detection rotation shaft are coupled to each other through the first locking portion formed on the motor shaft of the brushless motor body and the second locking portion formed on the detection rotation shaft of the rotation detector. Therefore, the reference position or zero point position of the switching signal in the rotation direction of each rotating shaft and the magnetic pole position of the rotor can be perfectly aligned.

Further, by coupling the positioning long hole formed in the attachment spring of the rotation detector and the pin formed in the brushless motor main body, the zero point position or the reference position in the switching signal obtained from the rotation detector is set to the brushless motor main body. It is possible to completely and easily obtain the alignment between the rotation detector and the brushless motor main body in a state where the position matches the predetermined magnetic pole position of the rotor.

Therefore, even if the rotation detector becomes defective and needs to be replaced, it is not necessary to detach the brushless motor body from the equipment and perform the coupling work using an electrical measuring device as in the conventional case. Just replace the detector and attach each locking part and each mounting locking part together,
It is possible to obtain a reliable connection, to exert a great effect not only at the time of manufacturing but also at the time of maintenance, and it is possible to significantly reduce the cost of maintenance work.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention,
FIG. 1 is a front view showing a rotation detector, FIG. 2 is a rear view showing a back surface of a brushless motor main body, FIG. 3 is a sectional view showing the entire structure, and FIG. 4 is a sectional view showing an example of a rotation detector. 5 and 6 are a side view and a rear view showing a conventional configuration. 1 is a brushless motor main body, 4 is a rotation detector, 5 is a detection rotary shaft, 10 is a drive coil, 20 is a first locking part (first pin), 21 is a second locking part (key groove), 22 is A positioning long hole, and 23 are pins.

Claims (5)

(57) [Scope of utility model registration request] A brushless motor main body (1) is provided with a switching signal for switching a driving signal to a plurality of driving coils (10).
A DC brushless motor with a detector, which is obtained from a rotation detector (4) connected to the motor rotation shaft (6), wherein a first locking portion () having a protruding shape formed on the motor rotation shaft (6) is provided. 20) and a second locking part (21) formed on the hollow detection rotary shaft (5) of the rotation detector (4) and engaging with the first locking part (20) and comprising a key groove. A mounting spring (3) having a plurality of spring pieces (3a) provided in the rotation detector (4) and having an elongated hole (7), and the spring pieces (3a).
Positioning slot (22) which is formed only in one of the slots and is located inside the slot (7), and inside the slot (22) which is provided in the mounting spring (3). A plurality of mounting elongated holes (3A) located at, and a pin (23) provided in the brushless motor body (1) and engaged with the positioning elongated hole (22). The width of the rotation detector (22) is almost the same as the width of the pin (23) and has a gap in the radial direction of the rotation detector (4). Division (20,2
1) and the positioning long hole (22) and the pin (23)
The brushless motor main body (1) is detachably provided through the second locking portion (21) and the positioning elongated hole (22) in the radial direction. DC brushless motor with detector, which is characterized in that it has a configuration. 2. The DC brushless with detector according to claim 1, wherein the first locking portion (20) has a pin shape formed orthogonal to the axial direction of the brushless motor (1). motor. 3. The DC brushless motor with a detector according to claim 1, wherein the first locking portion (20) comprises a key. 4. The DC brushless motor with a detector according to claim 1, wherein the rotation detector (4) comprises an encoder. 5. The DC brushless motor with a detector according to claim 1, wherein the rotation detector (4) is a resolver.