JP2017153278A - Hybrid stepping motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve an improvement in torque without changing an external dimension of a casing of a hybrid stepping motor.SOLUTION: A hybrid stepping motor according to the present invention includes: a rotor receiver (5) rotatably provided between a pair of bearings (11, 12) provided in a casing (1) having an annular stator (3); a pair of annular rotor cores (6, 14) provided on the outer periphery (5a) of the rotor receiver (5); and a first annular magnet (8) provided between the annular rotor cores (6, 14). In the hybrid stepping motor, second and third annular magnets (15, 16) are respectively provided on outer surfaces (6a, 14a) of the respective annular rotor cores (6, 14).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hybrid stepping motor, and more particularly to a novel improvement for improving torque by providing an annular magnet on each outer surface of a hybrid annular rotor core.

A number of documents have been disclosed as this type of hybrid type stepping motor that has been used in the past, and examples thereof include the configurations of Patent Documents 1, 2, and 3.
That is, in FIG. 2 of a rotating electric machine (not shown) of Patent Document 1, a permanent magnet is sandwiched between a pair of rotor yokes, and a casing is disposed close to each rotor yoke.
Moreover, in FIG. 2 of the stepping motor of patent document 2, a permanent magnet is only clamped between a pair of rotor yokes.
Moreover, in FIG. 1 of the hybrid type stepping motor of patent document 3, it is equivalent to the structure of the above-mentioned patent document 1. FIG.
Further, FIG. 2 in the present invention shows a cross-sectional perspective view of a configuration actually used in the above-described hybrid type stepping motor.
That is, a ring-shaped stator 3 having a stator winding 2 is provided on an inner wall 1a of a casing 1 having a box shape in FIG. 2, and a rotor provided on a rotating shaft 4 is provided inside the ring-shaped stator 3. A receptacle 5 is rotatably arranged.

  A hybrid stepping motor is provided by providing a pair of first and second annular rotor cores 6 and 7 and a first annular magnet 8 sandwiched between the annular rotor cores 6 and 7 on the outer periphery 5 a of the rotor receiver 5. 10 is configured.

JP 2012-244736 A Japanese Patent Laid-Open No. 9-298867 JP 2005-245162 A

Since the conventional hybrid stepping motor is configured as described above, the following problems exist.
In general, it is important for flat hybrid stepping motors such as those in Patent Documents 1 to 3 described above to achieve the required torque within a limited thickness.
Although there are various factors related to the motor torque, in the rotor-stator, increasing the cross-sectional area of the mutually generated gap is an improvement over the torque increase.
When the rotor-stator structure is viewed, the stator needs a coil end, and therefore there is a problem that the lamination thickness cannot be increased so much. On the rotor side, even if the lamination thickness is increased to increase the gap cross-sectional area, the gap cross-sectional area is cut by the magnet thickness sandwiched between the cores, and as a result, the cross-sectional area does not increase.
When the cross-sectional area is increased by reducing the magnet thickness of the conventional thickness, that is, the conventional thickness, the operating point due to the magnet magnetomotive force moves, so that the torque cannot be increased.
In the present application, a method for maintaining magnetomotive force is required even in a state where the thickness of the magnet sandwiched here is reduced.
Since the outside of the rotor becomes a dead space at the stator coil end, a magnet can be added here. By adding magnets and arranging them opposite each other via the ring-shaped rotor cores 6 and 14, it is possible to achieve a gap magnetic flux density equivalent to that of the conventional rotor core, resulting in increased torque by increasing the gap cross-sectional area. Is possible.

  A hybrid stepping motor according to the present invention includes a rotor receiver rotatably provided between a pair of bearings provided in a casing having an annular stator, a pair of annular rotor cores provided on an outer periphery of the rotor receiver, In a hybrid stepping motor provided with a first annular magnet provided between annular rotor cores, each outer surface of each annular rotor core is provided with second and third annular magnets, and Each of the ring magnets has a configuration in which the magnetic poles face each other through the ring rotor cores, and the pair of step portions formed on the inner wall of the casing includes the second and third ring magnets. Further, the thickness t of the first annular magnet is ½ of the conventional thickness. This is the configuration.

Since the hybrid stepping motor according to the present invention is configured as described above, the following effects can be obtained.
That is, a rotor receiver provided rotatably between a pair of bearings provided in a casing having a ring-shaped stator, a pair of ring-shaped rotor cores provided on the outer periphery of the rotor receiver, and provided between the ring-shaped rotor cores. In the hybrid stepping motor including the first annular magnet, second and third annular magnets are provided on the outer surfaces of the annular rotor cores, so that a gap magnetic flux density equivalent to the conventional one is provided on the rotor core. Therefore, torque can be increased by increasing the gap cross-sectional area as a result.
Moreover, each said ring-shaped magnet can concentrate a magnetic flux on each rotor core by comprising the structure by which each magnetic pole is opposingly arranged through each said ring-shaped rotor core.
Further, the pair of stepped portions formed on the inner wall of the casing is arranged on the inner side of the inner diameter surface of the second and third ring magnets, thereby the second and third ring magnets. Can be formed in each rotor core.
In addition, since the thickness t of the first ring-shaped magnet is ½ of the conventional thickness, it is possible to provide the above-described gap for mounting the second and third ring-shaped magnets on the outer surface of each rotor core. It was.

It is sectional drawing which shows the principal part of the hybrid type stepping motor by this invention. It is a cross-sectional perspective view which shows the principal part of the conventional hybrid type stepping motor. It is a cross-sectional block diagram for comparing the gap cross-sectional area of the conventional hybrid type stepping motor (A) and the hybrid type stepping motor (B) of this invention. It is a characteristic view which shows the torque improvement of the hybrid type stepping motor by this invention.

  The hybrid stepping motor according to the present invention is to improve torque by providing a ring magnet on each outer surface of a hybrid ring rotor core.

A preferred embodiment of a hybrid stepping motor according to the present invention will be described below with reference to the drawings.
In addition, the same code | symbol is demonstrated to the part which is the same as that of a prior art example, or an equivalent part.
In FIG. 1, a reference numeral 1 denotes a casing having a box shape in cross section, and an annular wall 3 having a stator winding 2 is provided on an inner wall 1 a of the casing 1.

A pair of bearings 11, 12 provided at the center of the casing 1 is provided with a rotating shaft 4 having a rotor receiver 5, and first and second annular rotor cores 6, 14 are disposed on an outer periphery 5 a of the rotor receiver 5. Is provided with the first annular magnet 8 sandwiched therebetween.
A second annular magnet 15 is provided on the outer surface 6 a of the first annular rotor core 6, and a third annular magnet 16 is provided on the outer surface 14 a of the second annular rotor core 14.

  A pair of first step portion 20 and second step portion 21 are formed on the inner wall 1a of the casing 1 on the inner side of the inner diameter surfaces 15a, 16a of the second and third annular magnets 15, 16. As a result, the first and second gaps 22 and 23 are formed between the outer surfaces 6a and 14a of the first and second ring-shaped rotor cores 6 and 14 and the casing 1, so that the ring-shaped magnets are formed. It becomes very easy to attach 15 and 16 to each said outer surface 6a, 14a easily.

  FIG. 3 shows the thickness t of the first annular magnet 8 as compared with the conventional stepping motor 10 of the conventional configuration (A) in which the thickness of the first annular magnet 8 is 1 mm, for example. The configuration (B) of the present invention having the second and third annular magnets 15 and 16 as shown in FIG. Therefore, it was confirmed that the configuration (B) of the present invention can be obtained with an increase in gap cross-sectional area (about 15%) compared to the conventional configuration (A).

The increase in torque of the hybrid stepping motor of the present invention by increasing the gap cross-sectional area described above is that each of the magnets 8, 15, 16 is connected to each of the magnetic poles S, N via each of the annular rotor cores 6, 14, as shown in FIG. As shown in B), by being magnetized so as to be opposed to each other, the above-described increase in cross-sectional area is increased by about 15%. A torque improvement of about 15% was obtained.
Therefore, as shown in FIG. 4, the torque characteristics that have been conventionally achieved at 1.5 A / phase can be realized at 1.3 A / phase.

Next, the gist of the hybrid stepping motor according to the present invention is as follows.
That is, a rotor receiver 5 provided rotatably between a pair of bearings 11, 12 provided on a casing 1 having an annular stator 3, and a pair of annular rotor cores 6, 14 provided on the outer periphery 5 a of the rotor receiver 5. And a hybrid stepping motor comprising a first annular magnet 8 provided between the annular rotor cores 6 and 14,
Second outer and third annular magnets 15 and 16 are provided on the outer surfaces 6a and 14a of the annular rotor cores 6 and 14, respectively.
Each of the ring-shaped magnets 8, 15 and 16 has a configuration in which the magnetic poles S and N are opposed to each other via the ring-shaped rotor cores 6 and 14, respectively.
The pair of stepped portions 20 and 21 formed on the inner wall 1a of the casing 1 is disposed inside the inner diameter surfaces 15a and 16a of the second and third annular magnets 15 and 16, and ,
The thickness t of the first annular magnet 8 is configured to be ½ of the conventional thickness.
Note that the conventional thickness is the thickness of the first annular magnet 8 used in the stepping motor before improvement.

  The hybrid type stepping motor according to the present invention can improve torque by providing a ring-shaped magnet on each outer surface of the hybrid-type ring-shaped rotor core, and obtain a large torque type stepping motor without changing the outer shape of the casing. Can do.

DESCRIPTION OF SYMBOLS 1 Casing 1a Inner wall 2 Stator winding 3 Ring-shaped stator 4 Rotating shaft 5 Rotor receiver 6 1st ring-shaped rotor core 8 1st ring-shaped magnet 10 Hybrid type stepping motor 11, 12 Bearing 14 2nd ring-shaped rotor core 15 2nd ring-shaped magnet 15a Inner surface 16 3rd ring-shaped magnet 16a Inner diameter surface 20 1st step part 21 2nd step part 22,23 1st, 2nd space | gap t thickness

Claims (4)

A rotor receiver (5) rotatably provided between a pair of bearings (11, 12) provided on a casing (1) having an annular stator (3), and an outer periphery (5a) of the rotor receiver (5) In a hybrid stepping motor comprising a pair of annular rotor cores (6, 14) provided and a first annular magnet (8) provided between the annular rotor cores (6, 14),
A hybrid stepping motor characterized in that second and third annular magnets (15, 16) are provided on the outer surfaces (6a, 14a) of the annular rotor cores (6, 14).   2. The hybrid according to claim 1, wherein each of the ring-shaped magnets (8, 15, 16) has a configuration in which the magnetic poles S and N are arranged to face each other via the ring-shaped rotor core (6, 14). Type stepping motor.   The pair of step portions (20, 21) formed on the inner wall (1a) of the casing (1) is located on the inner side of the inner diameter surfaces (15a, 16a) of the second and third ring magnets (15, 16). 3. The hybrid stepping motor according to claim 1, wherein the hybrid stepping motor is arranged.   4. The hybrid stepping motor according to claim 1, wherein a thickness t of the first annular magnet is configured to be ½ of a conventional thickness. 5.

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