JPH0239170B2 - SEIGYAKUTEN DENDOMOOTA - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a forward/reverse motor useful as a drive source for various hydraulic units, high-speed, high-force actuators, etc., or as a drive source for screw presses, etc.

(Prior art) Conventionally, to drive an electric motor, a current is applied to the stator coil each time, and when the electric motor stops, a brake device installed externally to the motor body is actuated to stop the motor. It was common practice to stop. In addition, in order to switch between forward and reverse rotation in a forward/reverse motor, it is possible to do so by switching the direction of the current flowing to the stator coil, or by switching a gear transmission mechanism that is installed outside the motor body. was normal. That is, the motor that is currently rotating in the normal direction is temporarily stopped, the current direction is reversed, and the motor is started in the reverse direction.

(Problems to be Solved by the Invention) In the conventional forward/reverse motor as described above, when starting or reversing directly by current control, such as by turning on current or reversing the direction of current, it is difficult for the drive shaft to reach the set speed. It takes a long time and a large current flows during the acceleration time. In addition, with this current control method, when a load is applied intermittently, the motor capacity must be set to the maximum value of the load, which requires an unnecessarily large motor and consumes a large amount of electrical energy. There's a problem. To compensate for this drawback, the motor rotates the flywheel via a small pulley and belt to store kinetic energy, and a clutch installed on the flywheel instantaneously starts the flywheel and at the same time instantaneously releases the kinetic energy. The method of doing this is adopted, but
This method requires a large space, and therefore the objects to which it can be applied as a driving source are limited. In the case of reversing, the reversing wheel is rotated from the flywheel via gears, and a clutch attached to it performs a rapid reversal start, but in such a case, a larger space is required, and the number of parts and mounting base are too large. The number of these is large, and the overall weight is also large.

The present invention eliminates the above-mentioned problems, and provides a compact, energy-saving, forward-reverse electric motor that is capable of instantaneous starting and reversal of the drive shaft, and instantaneous high output work.

(Means for Solving the Problems) A forward/reverse rotation electric motor according to the present invention includes a case in which a pair of stator coils are fixed to the inner periphery and an output shaft is pivotally supported at the center, and a pair of flywheels that are rotatably provided around a shaft and each has a rotor core fixed to its outer peripheral portion facing the stator coil; and a pair of flywheels that are arranged to be rotatable about a shaft and have rotor cores facing the stator coil fixed to their outer peripheries, and between each of the flywheels and the output shaft within the case. It has a pair of drive clutch mechanisms mounted thereon and a brake mechanism interposed between the case and the output shaft, and the pair of flywheels are driven in opposite directions by the bias of the stator coil. It is designed to be maintained in a rotating state.

(Example) Next, the present invention will be described with reference to the drawings.

The accompanying drawing is a longitudinal sectional view of a forward/reverse electric motor according to an embodiment of the present invention. A pair of stator coils 4, 1 are provided on the inner circumference of the motor case 1 and spaced apart in the axial direction.
04 is fixed, and these stator coils 4,
A pair of flywheels 5, 10 corresponding to 104
5 is placed inside the case 1. A rotor core 6,10 is provided on the outer periphery of each flywheel 5,105 facing the stator coil 4,104.
6 is fixed. One flywheel 5
is rotatably supported within the case by a bearing 17 placed near the center of the case 1 and a bearing 16 placed near one end of the case. A clutch mechanism for normal rotation drive is attached to the flywheel 5. First, the clutch mechanism for forward rotation on the flywheel 5 side will be explained.

A clutch boss 11 is fixed to the outer circumference of an output shaft 14 inserted through the center of the case inside the flywheel 5, and a clutch housing 7 is fixed to the inner circumference of the flywheel 5 on the outside. A friction plate group 12 is installed between them. A cylinder 10, which also serves as a case end cover, is fixed to one end of the case 1, and an annular piston 9 is accommodated in an annular cylinder chamber 18 of the cylinder 10. A clutch actuator 8 is held on the piston 9 via a bearing 13. 3 is a hydraulic line connected to the cylinder chamber 18. 15 is a bearing between the output shaft 14 and the cylinder 10.

The other flywheel 105 is arranged inside the left half of the case 1 along with the flywheel 5, and is rotatably supported by bearings 19 and 116 mounted on the case. A clutch mechanism for reverse rotation is provided between the other flywheel 105 and the output shaft 14. In the illustrated embodiment, the clutch mechanism for reverse rotation has the same structure as the clutch mechanism for forward rotation described above. Therefore, a redundant explanation of this part will be omitted, and only the names of each part will be described. 107 is a clutch housing, 112 is a friction plate group, 110 is a cylinder with an annular cylinder chamber 118 that is fixed in the case 1, 109 is an annular piston, 108 is connected to the piston 1 via a shaft support 113.
This is a clutch actuator pivotally supported by 09. An operating pressure fluid is introduced into the annular cylinder chamber 118 of the reverse clutch by a hydraulic line 103.

A brake mechanism is provided at the end of the case opposite to the forward rotation clutch mechanism. The end of the motor case on the brake mechanism side is formed into a concave shape so as to surround the output shaft 14, and this concave portion 21
is closed by a case end plate 26. 29 is a bearing between the output shaft 14 and the end plate 26. As will be described later, the concave portion of this case also serves as a brake side cylinder chamber. A brake boss 23 is fixed to the outer periphery of the output shaft 14 within the case concave portion 21,
A brake friction plate group 22 is mounted between the brake boss 23 and the inner wall of the concave portion of the case 1. A brake-side piston 24 that slides within the concave portion is housed on the axially outer side of the friction plate group 22;
Further, a brake-side cylinder chamber 30 is formed between the piston 24 and the case 1. piston 24
A compression spring 25 is installed between the case end plate 26 and the brake side piston 24, so that the brake piston 24 is always biased in a direction to press the friction plate group 22.
Reference numeral 31 denotes a hydraulic line communicating with the brake side cylinder chamber 30, and this hydraulic pressure moves the piston 24 in a direction away from the friction plate group 22 against the compression spring 25.

When a rotating magnetic field is generated in each of the stator coils 4 and 104 with, for example, three-phase alternating current in such a configuration, the rotor core 6 and flywheel 5 on one side and the rotor core 106 and flywheel 105 on the other side are , each rotates at a predetermined number of rotations. In this case, both flywheels 5,105
The relationships among the stator coils, rotor cores, and currents are determined so that they rotate in opposite directions. When the clutch mechanism for forward and reverse rotation is disengaged, the output shaft 14 is stationary, but both flywheels 5, 105 are rotating in opposite directions. This flywheel 5,1
During the rotation of 05, compressed fluid is supplied from the C side in the figure to the brake side cylinder chamber 30 via the line 31 to release the brake side friction plate group 22, and at the same time, the compressed fluid is supplied from the A side via the line 3 to the normal rotation side. When compressed fluid is supplied to the cylinder chamber 18, the piston 9 in the normal rotation side cylinder chamber moves to the left in the figure while the pressure of the fluid remains and presses the friction plate group 12, thereby causing the flywheel 5 The rotational torque is transmitted from there to the output shaft 14 via the friction plate group 12 and the clutch boss 11, and the output shaft 14 instantaneously enters a forward rotation state.
At this time, the fluid pressure to the cylinder chamber 118 of the reverse clutch mechanism is released, so the rotational torque of the flywheel 105 on the reverse side is not transmitted to the output shaft 14.

Next, when the pressure of the supply fluid on the A side and the C side is released, the transmission of normal rotational torque is cut off, and the piston 24 of the brake side cylinder 30 moves to the right in the figure by the force of the compression spring 25. , presses the brake side friction plate group 22. As a result, a stopping torque is transmitted from the case 1 to the brake boss 23 via the friction plate group 22 while the flywheel 5 remains rotating, and the output shaft 14 is momentarily brought to a stopped state.

In the case of reverse drive, compressed fluid is supplied from the B side and the C side to the respective cylinder chambers 118 and 30, and the fluid pressure in the cylinder chamber 18 on the A side is released. The rotational torque of reverse rotation is flywheel 10
5 to the output shaft 14 via the friction plate group 112 and the clutch boss 111, and the reverse rotation starts. Various types such as pneumatic, hydraulic, or electromagnetic types can be used as the clutch mechanism and brake mechanism described above, and the motor type is not limited to the three-phase cage type motor. Furthermore, although the above embodiment uses a single brake mechanism, separate brakes may be provided for each clutch.

(Effects of the Invention) As described above, according to the present invention, since the motor has a flywheel effect, it is an energy-saving type and can have a capacity of 1/4 to 1/6 of a conventional motor. In addition, instantaneous forward rotation of the drive shaft,
It is possible to perform instantaneous reverse rotation start and stop at a high frequency, and the entire motor is housed within a case, resulting in a very compact forward rotation electric motor.

In addition, the present invention is applied as a drive source for a hydraulic unit.
It can be applied in most cases to a wide range of fields that use hydraulics because it greatly reduces the capacity of electric motors, eliminates valves, prevents heat generation, saves energy, saves a lot of oil, and saves on piping. Furthermore, it can be applied to a wide range of fields as a drive source for screw presses and forging rolls, or as a drive source for high-speed, high-force rotational angle or linear actuators.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of a forward/reverse electric motor according to an embodiment of the present invention. 1... Case, 4,104... Stator coil,
5,105……Flywheel, 6,106……
Rotor core, 10, 110, 26... cylinder,
9,109,24...piston, 11,23...
Clutch boss, 12, 112...Friction plate group, 25
...Compression spring, 14...Output shaft, 18, 118,
30...Cylinder chamber, 3,103,31...Hydraulic line.

Claims (1)

[Claims] 1 A case in which a pair of stator coils are fixed to the inner periphery and an output shaft is pivotally supported at the center; a pair of flywheels to which facing rotor cores are fixed; a pair of drive clutch mechanisms installed between each of the flywheels and the output shaft within the case; A forward/reverse rotation electric motor, further comprising a brake mechanism interposed therebetween, wherein the pair of flywheels rotate in opposite directions due to biasing of the stator coil.