JPH0328907B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] 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, when various conditions such as the size and shape of an electric motor are determined, the torque and output are inevitably determined and the rated state is established. Therefore, it is not possible to increase the torque or output by using the same device, and for that purpose, it is necessary to prepare a larger device.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was created with the aim of providing an electric motor that can eliminate these drawbacks. A planetary reduction mechanism in which an output shaft is integrally connected to the rotation axis of a planetary gear that revolves while rotating on its own axis, and a cylinder shaft provided integrally with the rotation axis of the planetary gear as an armature axis, and a cylinder shaft outer periphery. An outer motor is formed on the side and can directly drive the output shaft independently, and an outer motor is formed on the inner circumferential side of the cylinder shaft with the cylinder shaft as a yoke and the sun shaft as an armature axis, and can directly drive the output shaft independently. The inner motor and the connection switching means for switching the connection of the power supply circuits of these inner and outer motors to parallel connection or series connection are provided, and furthermore, when each of these inner and outer motors is driven independently, the above-mentioned output It is characterized in that the torque and rotational speed on the shaft are set to be approximately the same.

With this configuration, the present invention enables easy switching between a torque-up state and an 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, reference numeral 1 denotes a yoke of an electric motor, and a plurality of outer permanent magnets 2 constituting an outer motor B are fixed around the inner periphery of the yoke 1 at predetermined intervals. 3 is an outer armature, and an armature shaft 4 of the outer armature 3
(which is rotatably supported on the yoke 1 by a bearing 4a) has a cylindrical shaft shape, and inner permanent magnets 2a constituting the inner motor B are arranged at a predetermined interval on its inner peripheral surface. Multiple pieces are fixed around the circumference. Reference numeral 5 denotes an inner armature arranged at the innermost shell part of the yoke 1, and an armature shaft 6 of the inner armature 5 has one end connected to the yoke 1 by a bearing 6a.
The other end is rotatably supported on the inner peripheral portion of the rotor shaft 4 by a bearing 6b.

7 is a planetary gear reduction mechanism;
The planetary gear 8 constituting the armature shaft 4
A shaft integrally protruding from the inner armature shaft 6 is an autorotation shaft 4b, and a gear provided integrally at the other end of the inner armature shaft 6 is a sun gear 6c. It revolves around the axis of the sun gear 6c while being guided by the formed internal gear 1a and sun gear 6c, and is decelerated relative to the output shaft 9 whose flange portion 9a is connected to the rotation axis 4b. It's getting old.

Reference numeral 10 denotes an outer brush provided on the inner periphery of the yoke 1 to make sliding contact with the commutator 11 of the outer armature 3 in an elastic manner, and 12 indicates the commutator 1 of the inner armature 5.
The inner brush 13 is an inner brush provided on the inner periphery of the armature shaft 4 so as to be in sliding contact with the armature shaft 4 in an elastic manner.
is electrically connected to a slip ring 14 provided on one side outer surface 4c of the armature shaft 4. On the other hand, the yoke 1 is provided with a brush 15 that slides against the slip ring 14 in an elastic manner, so that even if the outer armature 3 rotates, current can be supplied to the inner brush 13. It's summery. And the inner and outer motors A and B are
The structure is such that the output shaft 9 can be driven even if any one of them is driven independently.

FIG. 4 shows an example of the wiring diagram for the inner and outer motors A and B. According to this, both motors A and B are connected in parallel by turning on the first switch 16 and turning on the second switch 17. By doing so, they are connected in parallel, and in this way a connection switching means for switching the electrical connection of both motors A and B is constructed. Furthermore, both motors A and B are set in advance so that the torque T and rotational speed N of both motors at the output shaft 9 are approximately the same when each is driven independently.

In the embodiment of the present invention configured as described above, the outer motor B and the inner motor A are arranged so that the torque T and rotational speed N of both motors on the output shaft 9 are approximately the same when each is driven independently. If both motors A and B are connected in series, the voltage applied to each motor will be halved and the rotation speed N will also be halved.

By the way, in the above electric motor, the inner motor A
acts as a low-speed, high-torque motor, and outer motor B acts as a high-speed, low-torque motor, and each motor A, B is configured to be able to drive the output shaft 9 independently, so that the output Torque T of the shaft 9 is given by T=(BT)-(AT)+RX(AT), where AT: Torque of inner motor A, BT: Torque of outer motor B, R: Reduction ratio of the reduction mechanism 7.

Therefore, if both motors A and B are connected in series, the maximum output of motors A and B is now 2.5kw.
Moreover, if the reduction ratio R is (1/5),
The combined output, that is, the output of output shaft 6 is 2.25kw
becomes. On the other hand, if both motors A and B are connected in parallel, the current flowing through each will be halved, so
Applying the same specific numbers as above as conditions, the output of the output shaft 6 will be 4.5kw. 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, the output can be adjusted by simply switching the electrical connection between the inner and outer motors A and B, which are formed concentrically, in a series connection state or in a parallel connection state. It is possible to switch between a torque-up state (series connection state) in which the torque is approximately the same and the torque is approximately doubled, or an output-up state (parallel connection state) in which the torque is approximately the same and the output is approximately doubled. Therefore, although the electric motor is the same, the torque and output obtained from the output shaft 9 can be selectively switched as necessary, and it is possible to provide excellent characteristics that have not been seen before. be.

[Operation and Effect] In summary, since the present invention is configured as described above, the inner motor acts as a low speed, high torque motor, and the outer motor acts as a high speed, low torque motor. The electrical connection between the outer motor and the inner motor, which act on the motor, can be switched between series connection and parallel connection.As a result, the output shaft output is approximately the same, but the torque is approximately doubled. By switching the connection, it is now possible to easily switch between a torque-up state and an output-up state where the torque is approximately the same and the output is approximately doubled.
It is possible to provide excellent characteristics not found in conventional electric motors rated to one type.

[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, 1 is the yoke, 3 is the outer armature, and 4 is the outer armature.
is its axis, 4b is its rotation axis, 5 is its inner armature, 6 is its axis, 6c is the sun gear, 7 is the planetary gear reduction mechanism, 8 is the planetary gear, 9 is the output shaft, A is the inner motor, B is the outer motor It is.

Claims (1)

[Claims] 1. A planetary reduction mechanism in which an output shaft is integrally connected to the rotation axis of a planetary gear that rotates and revolves around a sun gear provided on a sun shaft, and a cylindrical shaft that is integrally provided in the rotation axis of the planetary gear. The outer motor is formed on the outer periphery of the cylindrical shaft with the cylindrical shaft as an armature shaft and can directly drive the output shaft independently. It is equipped with an inner motor that can directly drive the shaft independently, and a connection switching means that switches the connection of the power supply circuits of these inner and outer motors to parallel connection or series connection. An electric motor characterized in that the torque and rotational speed at the output shaft are set to be approximately the same when driven independently.