JPH0417001B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a conveying device using a linear motor.

Generally, linear motors (induction type linear motors) are used in many fields as a power generation source for article conveyance devices. The reason for this is because it is a so-called non-adhesive drive that generates linear thrust directly without contact, so unlike adhesive drive systems such as those used in traveling means, the friction between rotating bodies such as automobiles and trains and road surfaces or rails prevents slipping. This is because there is no room for this to occur and high acceleration/deceleration performance can be easily obtained.

By the way, the conveyance means based on a linear motor has a winding side (primary side for generating a moving magnetic field) and a conductor plate side (secondary side).
The running characteristics also differ depending on whether the next side (next side) is placed on the ground or on the vehicle. For example, if you want to obtain high acceleration/deceleration characteristics, place the primary side on the ground and
If the next side is attached to the transfer device side, the lightweight 2
Since only the next side travels together with the conveyance device, a large acceleration/deceleration can be obtained. However, this linear motor type conveyance means with the primary side located on the ground
There is a drawback that the state of the moving magnetic field applied from the ground to the next conductor is difficult to maintain constant, and as a result, the thrust obtained by the conveying device is not uniform, making it difficult to obtain constant speed. Therefore, when it is desired to travel at a constant speed over long distances, a secondary conductor with a length equivalent to the travel distance of the transport device is installed on the ground, and the moving magnetic field generating part on the primary side of the linear motor runs together with the transport device. Highly accurate constant speed performance can be obtained by controlling the speed by controlling the speed and performing speed feedback. However, normally the primary side of a linear motor is 2
Since the weight is larger than the next side, the primary movement method is 2.
Acceleration and deceleration performance is inferior to the next movement method. Therefore, a large-capacity linear motor has been used in order to make the high-speed region as long as possible and to obtain a large acceleration driving force of the linear motor. For this reason, there has been a tendency to have to provide a linear motor that provides a very large thrust in order to accelerate and decelerate not only the transport device but also the primary side, which accounts for the main part of the weight of the linear motor, in a short period of time.

The purpose of this invention is to provide high acceleration/deceleration performance by cleverly combining two driving means, the primary and secondary sides of which are installed at different locations.
An object of the present invention is to provide an article conveying device that can control constant speed travel in a high speed travel region.

The illustrated embodiment will be specifically described below. FIG. 1 is a front view of a conveying device embodying this invention, and FIG. 2 is a side view showing the arrangement of the primary and secondary sides of the linear motor along the direction of movement on the ground side. In each figure, 1 is the rail and the trolley 2
It is laid out along the conveyance route. The trolley 2 includes a base 2a for placing an object to be transported, and the rail 1.
It consists of a guide ring 2b. Reference numerals 3 and 4 denote linear motors, each of which is composed of secondary conductors 3a, 4a attached to the bogie 2 side and primary inductors 3b, 4b installed on the ground side. By the way, the linear motors 3 and 4 are used for accelerating and decelerating the bogie 2, and the arrangement of the ground side inductors 3b and 4b in the traveling direction of the bogie 2 is as shown in FIG. It has become P2. Reference numeral 5 denotes a linear motor, which is composed of a primary inductor 5b placed on the side of the trolley 2 and a secondary inductor 5a placed on the ground side, and the arrangement of the secondary conductor 5a is as shown in FIG. The control may be applied to the entire running range of the truck 2, or may be limited to only the high-speed control area P3, excluding the acceleration/deceleration areas P1 and P2. Reference numeral 6 denotes a power supply device that applies an alternating current voltage to a power supply line 7 arranged along the rail 1 that regulates the running of the trolley 2. Reference numeral 8 denotes a current collector, which is attached to the trolley 2, receives electric power from the power supply line 7, and guides it to the primary inductor 5b of the linear motor 5.

In the configuration of the above embodiment, it is assumed that the transport device trolley 2 is located in the acceleration region P1. At this time, when AC power is supplied to the inductors 3b and 4b of the linear motors 3 and 4 (linear motors for acceleration/deceleration), a moving magnetic field is generated from the inductors 3b and 4b, and this moving magnetic field and this Conductors 3a, 4
Based on the interaction with the eddy current generated by acting on a, sufficient thrust is given to the bogie 2 to bear the acceleration force at the time of starting. This results in an increase in speed as shown in FIG. Then, when the trolley 2 advances to the high-speed control area P3 after obtaining sufficient speed,
This time, the primary side inductor 3b of the linear motors 3 and 4,
4b is not present, so the linear motors 3, 4 do not work. On the other hand, when the trolley 2 advances to the high-speed control area P3, the high-speed control linear motor 5 is activated by the power supply device 6.
The bogie 2 receives electric power through the feeder line 7 and the current collector 8, generates a moving magnetic field from the inductor 5b, and moves forward by obtaining thrust based on the same principle as in the case of the linear motors 3 and 4 described above. At this time, the running speed of the bogie 2 is fed back by a speed generator or pulse pickup, and the inductor 5 is set to the set speed.
The voltage applied to b can be controlled. Next, when the trolley 2 reaches the deceleration region P2, the inductor 3 of each acceleration/deceleration linear motor 3, 4
A moving magnetic field is generated at b and 4b in a direction that applies a braking force to the truck 2. As a result, the speed of the truck 2 decreases rapidly as shown in FIG. 3 and comes to a stop. Further, when it is desired to transport the cart 2 in the same direction as before, the linear motors 3 and 4 are operated for acceleration to increase the speed, and then the high-speed control linear motor 5 is operated. By repeating this operation, the cart 2 is transported while stopping at several stations.

In the above embodiment, the acceleration/deceleration function is carried out by a type of linear motor in which an inductor is disposed on the ground, and the high-speed constant speed control after acceleration is carried out by a linear motor in which an inductor is disposed on the movable side. Although the configuration has been described, several different uses are also contemplated. For example, by simultaneously operating a linear motor for high constant speed control during acceleration and deceleration to promote acceleration and deceleration, or in particular applying this invention only to either acceleration or deceleration,
A configuration may also be adopted in which primary inductors are placed on the ground only at locations where acceleration or deceleration is required.

As described above, the conveyance device according to the present invention is
In addition to linear motors with an inductor on the movable side and a secondary conductor on the ground side, acceleration,
Large capacity to handle both or one of deceleration (compared to the linear motor that handles high constant speed drive mentioned above)
This linear motor is equipped with an inductor on the ground side and a secondary conductor on the movable side. Based on this configuration, the inductor side, which accounts for most of the weight of the large-capacity linear motor responsible for acceleration/deceleration, is installed on the ground side, and a very lightweight secondary conductor (iron plate, aluminum plate) on the movable side is installed on the ground side. etc.), it is possible to obtain high acceleration/deceleration control that is lightweight. ○B) Since the large power required for acceleration and deceleration required by high thrust generation is input from the ground side, there is no room to supply large power to the movable side, and the capacity of power receiving components (current collectors, etc.) on the movable side is large. There is no risk of any increase in weight due to this. ○ Since the linear motor that is responsible for running at high constant speeds only needs to generate enough thrust to overcome running resistance, it can be made very small in capacity, and the need to attach an inductor to the moving part (feedback, etc.) (for stable running) can be realized without increasing the capacity of current collectors or the weight of movable parts. ○2 When performing high constant speed control, feedback control is possible using a ground secondary type linear motor, and it has many features such as stabilizing constant speed running.

[Brief explanation of drawings]

Figure 1 is a front view showing an embodiment of the invention, Figure 2 is a front view showing an embodiment of the invention.
The figure is a principle diagram showing the arrangement of the linear motor on the ground side, and FIG. 3 is a graph showing the speed characteristics. 2... Truck, 3, 4... First linear motor,
5... Second linear motor, 3a, 4a... Secondary conductor, 3b, 4b... Inductor, 5a... Secondary conductor, 5b... Inductor.

Claims (1)

[Claims] 1. The first one is responsible for at least one of acceleration and deceleration.
A linear motor is provided such that its primary side inductor is placed on the ground in at least one of the acceleration area and the deceleration area in the conveyance path, and its secondary side conductor is placed on the movable side, and A second linear motor, which is smaller than the motor and has a capacity responsible for maintaining high-speed running on the movable side, has its primary inductor on the movable side and its secondary conductor on the ground at least in the high-speed region of the conveyance path. A conveyance device characterized in that the conveyance device is provided so as to be arranged respectively.