JPH04112664A - Driver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an open drive device for a distributed stepping motor.

[Prior Art] Conventionally, as shown in Japanese Patent Publication No. 61-22599, a drive device uses a motor as a driving force, and connects a shaft with a thread through a transmission device that combines large and small gears. It has been proposed to engage an arm and convert rotation of the motor into linear motion of the arm.

[Problem to be Solved by the Invention 1] However, this motor rotates continuously and is unitized, so it consumes a large amount of current and is not space efficient, and there are problems in terms of size and weight, especially when it is portable. . An object of the present invention is to provide a small and lightweight drive device by reducing current consumption and distributing motor elements.

[Means for Solving the Problems] The drive device of the present invention includes a distributed stepping motor consisting of a rotor, a stator with a hole for housing the rotor, and a coil block wound around a magnetic core, and a rotary motion of an n2 stepping motor. It is characterized by being composed of a conversion mechanism that converts the motion into linear motion.

〔Example〕

Next, details of the present invention will be briefly explained with reference to the drawings. 1st
．． FIG. 2 is a plan cross-sectional view showing an embodiment of the micro-discharge device according to the present invention. The micro-discharge device according to the present invention includes a distributed stepping motor 1 (hereinafter referred to as step motor),
A reduction gear train 10 that transmits the rotation of the step motor 1, a conversion mechanism 20 that converts the rotational motion into linear motion. A container 35 for fluid, especially a chemical solution, a circuit block 30 for driving the step motor l, a button-type battery 31 such as 1.5 or 3-inch silver oxide or lithium as a power source, and a display 32
, a lower case 33 for fixing and protecting each of the aforementioned elements;
and an upper case 34.

FIG. 3.4 is a plan sectional view showing the snap motor l. The step motor l has a rotor 2 consisting of a permanent magnet (2 poles) 2a and a rotor pinion 2b, an outer notch 3a and an inner notch 3.
This is a distributed morph consisting of a stator 3 having a hole 3c for accommodating the rotor 2, and a coil block 4 consisting of a lead board 4b with terminals treated at both ends of a coil wound around a magnetic core 4a. The moment of inertia of rotor 2 is 15mg
mm” or less, ampere turns 3 of coil block 4
5. Resistance 15-4. It is set to OKΩ. Stator 3
The angle θ between the outer notch 3a and the inner notch 3b is 38 to 48 degrees.
It is set to . The other end of the lead board 4b is connected to the circuit block 30. The magnetic poles N and S of the rotor 2 are stopped by the inner notch 3b at a position approximately 90° from the inner notch 3b. By using a step motor of this type, the current consumption can be reduced to 2 to 5 uA.

The reduction gear train 10 includes a rotor pinion 2b, intermediate wheels 11, 12.
13.14, consists of gear 15, and its reduction ratio is 1/1
It is set to 4400. The conversion mechanism 20 includes a right-handed shaft 21 to which the gear 15 is secured by tightening, caulking, etc., and an operating lever 22 having a female thread that engages with the shaft 21.

The circuit block 30 includes an oscillation circuit including a crystal oscillator, a frequency dividing circuit for obtaining a desired frequency, a plurality of switches for setting a desired circuit state, a drive circuit for obtaining a drive signal for the step motor 1, and a display body 32. The input signals are signals from the display drive circuit and frequency divider circuit and signals from multiple switches.
It is composed of a control circuit for bringing a drive circuit, a display drive circuit, and a frequency divider circuit into a desired circuit state.

FIG. 5 shows the drive signal from the aforementioned drive circuit. The signal entering one end of the coil is 08. The signal entering the other end is shown as 0□. 0 and 02 frequency is 01 at 4Hz
The phase difference between and 02 becomes a signal of 8)12. Further, the width T of the pulse is set between 1.7 and 7.8 ms.

Next, the operation will be explained. Output signal 0 from drive circuit
1 is applied to the coil, a magnetic field is generated, and the outer notch 3a
The thin wall portion formed by the hole 3C is saturated, and a magnetic pole is formed as shown in FIG. Therefore, the repulsive force is
The motor rotates counterclockwise and stops. Output signal 02 is then applied to the coil. The direction of flow in the coil is determined by the output signal 0. Since the magnetic poles formed on the stator are opposite to those shown in the figure, the rotor 2 rotates to the left due to the repulsive force. Rotor 2
The rotational force is transmitted to the gear 15 via the intermediate wheels 11 to 14, and the gear 15 rotates in the direction of the arrow in FIG. Since the shaft 21 also rotates in the same direction, the operating lever 22 moves in the direction of the arrow in FIG.

The actuating lever 22 pushes against the bottom of the container 35 and
The fluid in 5 is discharged. When the liquid is continuously discharged, the bellows part 35a of the container 35 contracts and is finally pushed to the image line position (FIG. 1). The discharge amount at that time is, for example, approximately 10 nl/s if the flat inner edge of the container 35 is Φ12 mm, and the effective capacity of the container 35 is 1
If it is 0cc, it can be discharged for 11 days. Further, a desired discharge amount can be selected by changing the cross-sectional area of the container 35, the frequency of the output signal, the reduction ratio, the lead angle, pitch, diameter, etc. of the screw. Furthermore, a syringe needle can be attached to the tip of the container 35.

FIG. 6 shows another embodiment of the conversion mechanism according to the present invention.

It consists of an operating lever 61 having a rack 61a that meshes with a pinion 60, which is the final stage of the reduction gear train, and converts rotational motion into linear motion. In addition, the machine frame 6 such as the lower case
2 is formed with a groove 62a, and the dowel 61 of the operating lever
b and 61c are engaged to guide linear movement. Further, as partially illustrated, the step motor and the reduction gear train are arranged in a plane on the machine frame 62. A syringe 63 discharges fluid when the end of the syringe barrel is pressed by an operating lever. [Effects of the Invention] As explained above, by configuring the drive device with a distributed step motor and a mechanism for converting rotation to linear motion, it is possible to realize a drive device with a small M order, low current consumption, and a small space. . In addition, it is a simple device structurally consisting of a step motor, a reduction gear train, and a conversion mechanism, which reduces costs and provides good handling. As a result, it is possible to provide, for example, a micro-dispensing device that is small, lightweight, and low-cost, and can be used for more than one year by simply replacing the container, and has a longer lifespan by replacing the battery.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the micro-discharge device of the present invention. FIG. 2 is a sectional view of the first section, and FIG. 3 is a plan view showing details of the drive device of the present invention. FIG. 4 is a sectional view of FIG. 3. FIG. 5 is a diagram showing drive signals for the step motor. FIG. 6 is a diagram showing another embodiment of the conversion mechanism according to the present invention.・・Distributed stepping motor ・・Rotor stator ・・Coil block ・・Shaft ・・Movement lever or more / 1 2a 1b 6th garden

Claims (1)

[Claims] A drive characterized in that it is comprised of a distributed stepping motor consisting of a rotor, a stator with a hole for housing the rotor, and a coil block wound around a magnetic core, and a conversion mechanism that converts the rotational motion of the stepping motor into linear motion. Device.