JPH01117633A - Electric motor - Google Patents

Abstract

PURPOSE:To obtain a motor where a torque going-up state and an output going-up state can be simply changed from each other by providing the autorotation shaft and sun shaft of a planetary reduction mechanism respectively with separate armatures and by providing a means for switching the series and parallel connections thereof. CONSTITUTION:In a motor with a planetary reduction mechanism connecting an output shaft 9 with an autorotation shaft 4b which revolves round a sun shaft 6 while revolving on its axis, said autorotation shaft 4b is integrally fitted with an outer armature 3 for revolving round the sun shaft to form an outer motor B. Also, the sun shaft 6 is integrally fitted with an inner armature 5 for revolving it on its axis to form an inner motor A. Then, there is provided a switching means for switching the series and parallel connections of said inner and outer motors A, B. In this manner, a torque going-up state can be obtained by the series connection of motors and an output going-up state, by the parallel connection thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric motor that can be easily switched between a torque-up state and an output-up state.

[Prior art and problems to be solved by the invention] Today,
As an electric motor, once the conditions such as its size and shape are determined,
Along with this, torque and output are inevitably rated and fixed, so it is not possible to increase torque or output with the same thing, and for that purpose it is necessary to prepare a larger one. There are drawbacks.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was created for the purpose of providing an electric motor that can eliminate these drawbacks. In an electric motor that has a biased planetary reduction mechanism formed by connecting an output shaft to the rotation axis of a planetary rotating body that revolves around the earth, an armature is integrated with the rotation axis in the yoke of the electric motor, and the rotation axis is connected to the sun. An outer motor that operates to revolve around the axis, and an inner motor that uses the armature shaft of the outer motor as a yoke and whose armature is integrated with the sun shaft and operates to rotate the sun axis. The present invention is characterized by having connection switching means for switching the electrical connection to the motor between parallel and series.

With this configuration, the present invention makes it possible to easily switch between the torque-up state and the output-up state, although they are the same.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, 1 is a yoke of an electric motor, and the yoke 1
A plurality of outer permanent magnets 2 are fixed around the inner periphery at predetermined intervals. 3 is an outer armature, and the armature shaft 4 (bearing 4a) of the outer armature 3 is
(which is rotatably supported by the yoke 1) has a cylindrical shape, and a plurality of inner permanent magnets 2a are fixed around the circumference at predetermined intervals on its inner peripheral surface.

Reference numeral 5 denotes an inner armature disposed in the innermost shell of the yoke 1, and the armature shaft 6 of the inner armature 5 has one end connected to the yoke 1 by a bearing 6a, and the other end connected to the inner periphery of the rotor shaft 4 by a bearing 6b. Each part is rotatably supported by a shaft.

7 is a planetary gear reduction mechanism, and the planetary gear 8 constituting the reduction mechanism 7 has a shaft protruding from the armature shaft 4 as an autorotation shaft 4b, and a gear provided at the other end of the inner armature shaft 6 as a sun. An internal gear 1a formed on the inner periphery of the yoke 1 while rotating around the rotation axis 4b as a gear 6c.
It revolves around the axis of the sun gear 6C while being guided by the solar weight 6C, and is decelerated relative to the output shaft 9 having the flange portion 9a connected to the rotation shaft 4b.

Reference numeral 10 denotes an outer brush provided on the inner periphery of the yoke 1 to come into sliding contact with the commutator 11 of the outer armature 3 in an elastic manner;
is an inner brush provided on the inner periphery of the armature shaft 4 so as to be in sliding contact with the commutator 13 of the inner armature 5 in an elastic manner.
It is electrically connected to a slip ring 14 provided in the. On the other hand, the yoke 1 is provided with a brush 15 that slides in elastic contact with the slip ring 14, so that even if the outer armature 3 rotates, current can be supplied to the inner brush 13. There is.

Figure 4 shows an example of the wiring diagram for internal and external motors A and B.
According to this, both motors A and B are connected in series by turning on the first switch 16, and are connected in parallel by turning on the second switch 17. In this way, the electrical connection is switched. Connection switching means is configured.

In the embodiment of the present invention configured as described above, when the outer motor B and the inner motor A are individually operated, the torque T and rotational speed N of both motors at the output shaft 9 are set to be the same. In this state, both motors A
, B are connected in series.

The voltage applied to each motor is halved and the rotation speed N is also halved. By the way, in the above electric motor, the inner motor A acts as a high speed, low torque motor, and the outer motor B acts as a low speed, high torque motor.
And it is directly connected to the output shaft 9, so the output shaft 9
The torque T of is T= (BT)-(AT)+RX
(AT) However, AT: Torque of inner motor A BT: Torque of outer motor B R: Given by the reduction ratio of the reduction mechanism 7. If both motors A and B are connected in series, the maximum output of motors A and B is now 2.5.
kti and the reduction ratio R is (115),
The combined output, that is, the output of output shaft 6 is 2.25 ktg
On the other hand, if both motors A and B are connected in parallel, the current flowing through each will be halved, so if we apply the same specific numbers as above as conditions, the output of the output shaft 6 will be 4.5
It becomes kw. The relationship between torque T and rotational speed N with respect to current value changes in the case of series connection and parallel connection is shown in a graph in FIG.

In this way, in the present invention, by simply switching the electrical connection between the inner and outer motors A and H, which are formed concentrically, in series or in parallel, the output can be kept approximately the same and the torque can be maintained. It is possible to switch between a torque-up state where the torque is approximately doubled, or an output-up state where the torque is approximately the same and the output is the same. Therefore, even though the motor is the same, the output shaft 9 This means that the torque and output obtained from the engine can be selectively switched as needed, thereby providing excellent characteristics that have not been seen before.

[Operations and Effects] In summary, since the present invention is configured as described above, it is important to determine whether the electrical connection between the outer motor and the inner motor formed within the yoke is a series connection or a parallel connection. By switching, it is possible to select between a torque-up state and an output-up state, even though they are the same, and it is possible to provide excellent characteristics not found in conventional electric motors.

[Brief explanation of the drawing]

The drawings show an embodiment of the electric motor according to the present invention, in which FIG. 1 is a partially sectional side view of the electric motor, FIG. 2 is a partially sectional front view of the electric motor, and FIG. 3 is a diagram showing changes in current value. FIG. 4 is a graph showing the relationship between rotational speed and torque, and FIG. 4 is a wiring diagram. In the figure, ■ is the yoke, 3 is the outer armature, 4 is its axis, 4b is the rotation axis, 5 is the inner armature, 6 is the axis,
6c is a sun gear, 7 is a planetary vehicle speed reduction mechanism, 8 is a planetary gear, 9 is an output shaft, A is an inner motor, and B is an outer motor. Patent applicant: Mitsuba Electric Manufacturing Co., Ltd. No. 1
Figure 2 Diagram Za Figure 3 Figure 4

Claims (1)

[Claims] In an electric motor equipped with a planetary reduction mechanism formed by connecting an output shaft to the rotation axis of a planetary rotating body that revolves while rotating around the sun axis, an armature is integrated with the rotation shaft within the yoke of the electric motor. an outer motor that operates to rotate the axis of rotation relative to the sun axis, and an inner motor that uses the armature axis of the outer motor as a yoke and whose armature is integrated with the sun axis and operates to rotate the sun axis. What is claimed is: 1. An electric motor characterized in that it has a connection switching means for switching electrical connections between the internal and external motors in parallel and in series.