JPS58215961A - Dc motor - Google Patents

Abstract

PURPOSE:To perform a torque control in a wide range by rotatably mounting the second rotational shaft coaxial with the first rotational shaft and providing an armature and a field coil on the respective shafts. CONSTITUTION:The first and second armatures 3, 4 are provided on the concentric rotational shafts 1, 2 in a double structure. When the first armature 3 is rotated, the shaft 2 is fixed by a clutch 7, a switching circuit 15 is switched to flow the field current through the first field coil 5, and an armature current is flowed through brush pair 11 and a commutator 9, thereby rotating it. When the armature 4 is rotated, the field current is flowed through the coil 6 by the switching circuit 15 in the same method as above, thereby rotating it.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a DC motor, and more particularly to a DC motor designed to improve torque control.

Conventionally, when changing the generated torque in one DC motor, the torque could only be obtained within a limited range. The torque of a DC motor is T=KTΦIa, where the generated torque is T, and the torque constant is KT. Therefore, the generated torque is proportional to the magnetic flux φ and the electric current a. Regarding magnetic flux distortion, it is generally required that the magnetic flux is saturated and becomes constant, that the thickness of the core cannot be made very large, and that when driving a DC electric IvI, it must be driven with less current and a smaller electric field. For this reason, the setting range of the torque constant becomes very narrow, and for other reasons, the range of torque control becomes narrow as described above.

Therefore, we also use a DC motor in which multiple armatures are placed close to each other on a common rotating shaft, the excitation of each armature is switched and controlled, and the torque control is made variable to perform torque control. Is it on Cape Liy 11? If several armatures are provided, the motor itself becomes large and is inconvenient to handle.

The object of the present invention is to provide a DC motor which can perform the above-mentioned torque control over a wide range v11, and which has a compact motor structure and is easy to handle. That is, a concentric cylindrical second rotating shaft is rotatably attached to the first rotating shaft via a bearing, and a concentric cylindrical fixed yoke is attached to the second rotating shaft via a bearing. The outer cover is attached, a first armature is provided on the first rotating shaft, a second armature is provided on the second rotating shaft, and a first field coil facing the first armature is connected to the first armature. This is a direct current drive comprising a second field coil facing the second armature attached to the fixed yoke outer sheath. An example of a DC motor will be explained.

The figure shows an electric motor for direct b1, which is an example of actual application of this invention.
il+ sectional view. This direct current T) i:motor (d) has a first armature (3) and a second armature
4), and has a double structure as shown in the figure. Each electric f
The armature windings are connected to the four armature windings by a known method, and the circuits of the 7111 armature windings are arranged in order.
A pair of brushes 0υa4 is provided so as to contact the commutator (9) and the GTM K sof]5. The brushes are connected to a switching circuit (1
It is connected to ~. Around the armatures (3) and (4), that is, on the inner surface of the armature (4) for the armature (3), the armature (4) On the inner surface of the cover, there are a first field coil (5), a second field coil (5), and a coil (5).
6) are provided in a known manner, and connection lines for the 1F flow supply to these field coils (5) and (6) are also not shown. Switching circuit (connected to 15+. Rotation 11t (
2) is provided with a clutch (7) for fixing the rotating shaft (2), which is fixed by being connected to the fixed yoke jacket. The base 0 is also provided with a clutch (8) 21 for fixing the rotating shaft (1), which is fixed by being connected to the rotating shaft (1).

In the above rt configuration, when rotating the first armature (3), the clutch (7) is connected to the fixed yoke outer sheath Qt9.
to fix the rotating shaft (2) and switch the switching circuit θ~ to the first
Field type m11 is applied to the field coil (5), and the armature (1)
The armature winding of ↑11. It can be rotated by flowing current. When the second armature (4) is rotated, the clutch (8) is rotated! 1h (1) and fix it, and the clutch (7) is disconnected from the fixed yoke jacket αQ. Then, the switching circuit a0 causes the second field coil (6
), and the armature current can be caused to flow through the Tonisogo winding of the second armature (4), thereby making it possible to rotate.

Since the DC motor according to the present invention is configured as described above, the first electric armature and the second armature can be rotated separately. Therefore, by providing a difference in the capacity a, it is possible to bring about a difference in the generated torque when the rotating shaft (L bar 2) is used as a power shaft. It is possible to obtain the same effect as driving small- and large-capacity motors with 91 DC motors, and the control range of the generated torque can be expanded compared to the conventional single DC motor. can. In fact, compared to the case where electric motors for the number of rice grains are connected on the same axis, it can be integrated into a compact structure and is easier to handle.

As described above, according to the present invention, it is possible to provide a DC motor that is easy to handle and allows a wide range of torque control to be performed using a single DC motor.

Note that this invention is not limited to the above embodiments;
The clutches for fixing the rotating shafts (1) and (2) may be configured to be interlocked.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is a thin sectional view showing a DC motor according to an embodiment of the present invention. (IH2)...Rotating shaft (3)...First armature (4)...Second armature (5)...First
Field coil (6)...Second field coil (7) (8
)...Clutch ui...Fixed yoke outer cover

Claims (1)

[Claims] 1. A cylindrical second shaft concentric with the first rotating shaft via a bearing.
At the same time, a concentric cylindrical identification yoke jacket is attached to the second rotating shaft via a bearing, and the first armature is attached to the rotating shaft of A↓1, and the second A second armature is provided on the rotating shaft of the rotary shaft, a first field coil facing the first armature is mounted on the second rotating shaft, and a second field coil facing the second armature is provided on the second rotating shaft. is attached to the fixed yoke outer sheath. 2. The first rotation axis and l/IIm second rotation axis.
1. A DC motor according to claim 1, which engages a clutch with respect to a fixed part of the motor.