KR820000149Y1 - Counter using shading type synchronous motor - Google Patents

Abstract

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Description

Weighing device using shading synchronous motor

1, 3 and 4 are schematic diagrams of different embodiments of the present invention.

2 is an operation explanatory diagram of a shading synchronous motor having a permanent magnet rotor.

The present invention relates to a metering device using a shading synchronous motor for remotely monitoring the measured quantity of the instrument or for intensively monitoring the measured quantity of a plurality of instruments.

For example, it is a weighing device that displays the measured quantity by receiving the sending pulse from the meter with the sending device or the reactive meter with the sending device, etc., and the receiving relay, the amplifying motor, the gear wheel train, the character display device. It is known to have a.

In this apparatus, the amplification motor is always excited, but rotation is prevented because the stopper fixed to the motor side is caught by the armature of the reception relay.

The receiving relay is operated by the transmitting device from the instrument with the transmitting device, the stopper is peeled off from the armature, the amplification motor rotates, and the display mechanism displays the measured amount via the gear train according to the rotation. .

However, these devices are expensive in terms of amplification motor and reception relay, and require a rotation time of a stopper fixed to the axle of the amplification motor. It is bad.

As another conventional device, it is known to display a measured amount by using a stepping motor that follows the rotation in response to an electrical pulse transmitted from an electric power meter with a transmitter. Since more than three outgoing pulse transmission lines of the electricity meter are required, there is a drawback that the facility cost is high when the metering is performed remotely.

The object of the present invention is to eliminate the drawbacks of the conventional apparatus as described above, simplify the configuration of the improved apparatus and improve the followability and at the same time reduce the cost of the facility.

The object of the present invention is a relay or electronic circuit for receiving a pulse of a period proportional to the measured amount and converting it into an alternating DC pulse, a shading type synchronous motor having a permanent magnet rotor, and the measurement It is achieved by providing a metering mechanism for displaying the amount of letters, and spep-driven the shading synchronous motor according to the alternating alternating pulse of +-, and inducing rotation of the shading synchronous motor to the mooring mechanism.

As a result, the present invention simplifies the construction of the measuring device, has good tracking performance, and has only two pulse transmission lines of the measured amount, so that the cost of the facility can be reduced compared to the three conventional pulse total damages. have.

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

1, 3 and 4 are schematic diagrams showing different embodiments of the present invention, and FIG. 2 is a diagram illustrating the operation of a two-wire shading type synchronous motor. In addition, the same code | symbol is used for each same thing in each figure.

In Fig. 1, reference numeral 1 denotes a measurement instrument for character display, reference numeral 2 denotes a gear wheel sequence, and reference numeral 3 denotes a two-wire shading type synchronous motor having a permanent magnet rotor (hereinafter referred to as a motor).

(4) is a drive circuit of the motor (3), the input terminals 41, 42 of the input transformer, rectifier circuit, smoothing circuit, for example, the transmission pulse of the electricity meter with the transmitter is not shown. The positive pulse is input via the input.

(5) is a relay operated by an input pulse, (6) is a movable contact of the relay (5), and (7) and (8) are fixed contacts of the relay (5).

(9) denotes an AC power source, and (10) and (11) denote diodes and capacitors, respectively, and an AC voltage supplied from the AC power source 9 is positively influenced by the diodes 10 and the capacitors 11 respectively. It is converted into a positive DC voltage.

The fixed contact 7 of the relay 5 is connected to the positive voltage side and the fixed contact 8 is connected to the negative voltage side, and one of the winding terminals of the motor 3 is movable of the relay 5. The other terminal is connected to the zero potential portion of the power supply.

The motor 3 is shown with a permanent magnet rotor C ₁ -C ₁₆ having 16 pole magnetism on the periphery of the cylinder, and the permanent magnet rotor C ₁ -C ₁₆ as shown in FIG. It has stators a _{1-a 6} and b _1- b ₆ which are inserted between female coils which are not present, and a shading plate is attached to the stators a ₁ , a ₂ , a ₄ , a ₅ and b ₁ , b ₄ . .

Next, the operation of the relay 5 and the motor 3 will be described.

In the input terminals 41 and 42 shown in FIG. 1, there is no pulse input in a period proportional to the measured amount, i.e., the pulse of origin from the wattmeter with a transmitter, and no current flows through the relay 5, and its operation is performed. When the contact 6 is in contact with the stationary contact 8 side, a current flows in the direction opposite to the arrow direction shown in the motor 3, and the excitation coil of the motor 3 causes the motor 3 to flow. The stator assumes that the stators a _{1-a 6} are magnetized to the S pole and the stators b _1- b ₆ are magnetized to the N pole as shown in FIG.

At this time, the attraction force and the repulsion force between the magnetic poles of the stators a _{1-a 6} (S pole), b _1- b ₆ (N pole) and the rotor C _1- C ₁₆ of the motor 3 are the same, The rotor is stopped because the torque is zero.

When a pulse is input to the input terminals 41 and 42, a current flows through the relay 5 so that the movable contact 6 is separated from the fixed contact 8 side and connected to the fixed contact 7 side.

As a result, the current in the arrow direction shown in FIG. 1 flows to the motor 3. The excitation current in the opposite direction flows to the excitation coil of the motor 3 by this current, so that the stators a ₃ , a ₆ are supplied to the N pole and the stators b ₂ , b ₃ , b ₅ , and b ₆ are Magnetized to the pole (figure 2).

However, stators a ₁ , a ₂ , a ₄ , a ₅ , b ₁ , b ₄ with a shading plate attached are stators a ₃ , a ₆ , b ₂ , b ₃ , b _{5 with} the phase of the magnetic flux not attached to the shading plate. , b ₆ is delayed by the effect of the reaction field of the short-circuit current flowing through the shading plate, and stator a ₁ , a ₂ , a ₄ , a ₅ are S poles and stator b ₁ , b ₄ are N poles. It is magnetized to.

For this reason, the balance between the suction force and the repulsive force between the magnetic poles is broken, and a rotation torque for the rotor is generated, and the rotor starts to rotate clockwise. Next, the magnetic flux phase of the stator (a ₁ , a ₂ , a ₄ , a ₅ , b ₁ , b ₄ ) with the shading plate and the stator (a ₂ a ₆ , b ₂ , b ₃ , b ₄ without the shading plate) , b ₆ ) When the magnetic flux phases are the same, each stator a _{1 to a 6} and b _{1 to} b ₆ are stator a _{1 to a 6} as the N pole and the stator as shown in FIG. b ₁ to b ₆ become the S pole.

And when the rotor rotates 360 ° / 160,000 clockwise, the suction force and repulsion force between the stator and the magnetic pole of the rotor become the same, so that the rotation torque becomes zero and the rotor stops.

Next, when the input pulses disappear from the input terminals 41 and 42, no current flows to the relay 5 of the motor driving circuit 4, and thus the movable contact 6 is fixed at the fixed contact point 7 side. It switches to the contact point 8 side.

For this reason, the current in the opposite direction flows to the excitation coil of the motor ₃ , and as shown in Fig. 2 (d), the stators a ₃ and a _{6 move} to the S pole and the stators b ₂ , b ₃ , Although b ₅ and b ₆ are magnetized to the north pole, stators a ₁ , a ₂ , a ₄ and a ₅ with a shading plate are magnetized to the north pole and stators b ₁ and b ₄ remain magnetized to the south pole.

Therefore, the rotation torque is generated by the difference in the magnetic flux phase between each stator, and the rotor starts to rotate.

And as shown in (e) in Fig. 2, when the stator a ₁ -a ₆ is magnetized to the S pole and the stator b ₁ -b ₆ is magnetized to the N pole, if the rotor rotates only 360 ° / 16, the rotation torque is zero. The rotor stops.

Therefore, according to the present invention, the rotor of the motor 3 rotates 1/16 of the leading edge of the input pulse and 1/16 of the trailing edge of the input pulse.

Since the input pulse is proportional to the measured amount, that is, the pulse of the wattmeter with the transmitter, the larger the measured amount, the larger the number of pulses in a certain time, and the smaller the measured amount, the smaller the number of pulses in a certain time.

The rotation angle of the motor 3 is proportional to the number of input pulses, and the larger the measured amount, the faster the rotation, and the smaller the measured amount, the slower the rotation. The rotation of the motor 3 is interposed between the gear wheel rows 2. It is transmitted to the metering mechanism (1) can display the measured amount letters.

3 is a schematic view showing another embodiment of the present invention.

In the embodiment of FIG. 1, a positive polarity voltage is required as the motor driving power supply. However, according to the embodiment of FIG. 3, the motor 3 is driven by one DC voltage while increasing the relay contact point. can do. In FIG. 3, the relay 50 has movable contacts 51 and 52 and fixed contacts 7, 8, 53 and 54.

According to this embodiment, when the input pulse is input to the input terminal 41, 42, the movable contact 51, the fixed contact 7 and the movable contact 52 and the fixed contact 54 of the relay 50 When the motor 3 is connected, current in the direction of the solid arrow flows, and when the input pulse disappears, the movable contact 51, the fixed contact 53, the movable contact 52, and the fixed contact 8 of the relay 50 are connected. Thus, the current in the dotted arrow direction flows to the motor 3.

Therefore, the motor 3 performs the same operation as the embodiment shown in FIG.

FIG. 4 shows a circuit diagram using an electronic circuit instead of the relay shown in FIG. 1 as another embodiment of the present invention.

In FIG. 4, reference numeral 9 denotes an AC power supply, 91 denotes a power supply transformer, 10 denotes a rectifier, and 11 denotes a smoothing capacitor. (12)-(15) indicate a transistor, (16) is a surge voltage absorption capacitor due to excitation coil reactance of the motor 3, and (17) and (18) are transistors 13 and (15) is a diode for overvoltage protection. (19)-(26) indicate a resistance, respectively, and the resistor 22 is a resistance for short-circuit protection when the transistors 13 and 15 are simultaneously conducted.

+ Indicates positive polarity,-indicates negative polarity, and 0 indicates zero potential.

Next, the operation will be described.

Assuming that there are no input pulses at the input terminals 41 and 42, the transistor 12 is not conducting because the base current does not flow.

The collector of the transistor 12 is connected to the base of the transistor 13 via a resistor 21. When the transistor 12 is not conducting, the transistor 13 is in an off state because the base current does not flow. This cut | disconnects the electric current which flows into the motor 3 from the side.

On the other hand, since the base of the transistor 14 is biased on the side by the resistor 24, a base current flows in the transistor 14, so that the transistor 14 conducts.

The collector of this transistor 14 is connected to the base of the transistor 15 via a resistor 26. Since a current flows through the base of the transistor 15, the transistor 15 is conducting.

Therefore, the current flows to the motor 3 in the opposite direction to the arrow shown in the drawing via the resistor 22 and the transistor 15.

Next, when an input pulse enters the input terminals 41 and 42, the base potential of the transistor 14 is displaced to the side by the resistor 23 so that the base current does not flow. do.

Since the transistor 14 becomes non-conductive, the base current of the transistor 15 also does not flow, so that the transistor 15 becomes non-conductive and cuts the current flowing through the motor 3 on the negative axis.

On the other hand, the transistor 12 conducts because the base current flows through the resistor 19, and because the current flows through the base of the transistor 13, the transistor 13 conducts.

Due to the conduction of the transistor 13, current flows in the direction of the arrow from the + axis to the motor 3.

By this current, the stator of the motor 3 is magnetized as shown in FIG. 2 (b), the magnetic flux phase of the stator is generated, and the rotation torque is generated, and the rotor of the motor 3 rotates 1 / 16th of a second. To stop.

When the input pulses disappear from the input terminals 41 and 42 next, the transistors 12 and 13 become non-conductive, and the transistors 14 and 15 conduct current to flow to the motor 3. Flows in the opposite direction to the arrow.

By this current, the rotating torque is generated in the motor 3, and the rotor stops at 1/16 rotation.

As described above, the present invention eliminates the need for expensive amplification motors and receiving relays as in the prior art, and can be used as a stepping motor by stepping a shading type synchronous motor with a permanent magnet rotor. In addition, since the followability is good and the pulse transmission lines of the measured amount are two, there is an advantage that the facility cost can be reduced.

Claims (1)

Weighing apparatus for receiving a pulse of a period proportional to the measurand and displaying the measurand, wherein the relay 5 converts the pulse into an alternating DC pulse, an electronic circuit, or a permanent magnet rotor C _1- ( C ₁₆₎ provided and, further driving the assay dinghyeong synchronous electric motor 3 by the alternating direct current pulses to the metering mechanism (1) for displaying assay dinghyeong synchronous motor (3), the letter to the measured amount with, the assay Weighing device using a shading synchronous motor (3), characterized in that to guide the rotation of the ding-type synchronous motor (3) to the metering mechanism (1).