JPS58159676A - Starting method for motor - Google Patents

Abstract

PURPOSE:To suppress the rush current at the time of changing a tap by automatically switching all taps of an autotransformer and starting a motor. CONSTITUTION:When a start pushbutton switch is closed, electromagnetic contactors 6-N, 6-1 are closed, and a voltage of 25% of full voltage is applied to a motor 1. After several seconds, the contactor 6-N is turned OFF, the contactor 6-1 is OFF, and the 6-2 is ON. At this time an autotransformer 3 operates as a reactor, thereby suppressing the rush current. After several seconds, the contactor 6-N is closed, and the voltage of 42% of the full voltage is applied to the motor 1. Thereafter, the contactors 6-3, 6-4 are similarly sequentially closed, the voltage applied to the motor 1 is sequentially increased. In this manner, the rush current at the time of changing the taps can be suppressed.

Description

[Detailed Description of the Invention] The uninvention is cage-shaped induction! Short d with Kiniso! This article relates to a method for starting a gJ machine using an autotransformer, that is, starting a condolfer.

In conventional Condorfa startup, at the beginning of startup, the transformer is connected to the starting compensator, the Kosumi point is opened and the series reactor is connected, and finally the intermediate tap is connected to the power source and the intermediate tap is opened for operation. It is about to enter the state. By using only one tap at a time, the inrush current was limited by a reactor during switching to full voltage after the transformer was started with a reduced voltage of 1.1. For example, if the starting torque of the load is large or easy, it is difficult to start the motor, so it is necessary to be able to connect the tap. Since it is close to the full weight pressure, if it is large or small, the electric current and pressure 4F will be large and it will be difficult to start, which is the disadvantage of opening the ring.

The non-invention is to try to eliminate the drawbacks of the conventional methods, and is it possible to apply the contrenois starting to tap the transformer? ;+,
, Is it effective to eliminate the N voltage drop due to current and a small amount of IC due to current? It is an object of the present invention to provide a method for starting a cassette, which uses an autotransformer including a cassette, to start the inrush midstream at a 1.tau. The actual state of the present invention will be explained with reference to the drawings.
The squirrel cage-shaped disturbance pier is connected to the autotransformer 3 and the tap, and the contactor 4 includes one contactor 4.
The overflow is applied to the start-up 62, and during start-up, all the taps are sequentially switched as a transformer and a reactor to limit the inrush current and operate. Shio I]
After turning on the start push button switch (not shown),
Magnetic contactor 6-N.

6-1 is turned on, the autotransformer 3 is connected to the 50% tap 3-1 of the rated voltage, and 25% of the total voltage is applied to the motor 1, causing the *magnetic contactor 6 to turn on.
-N goes OFF after a few seconds, and autotransformer 3 acts as a reactor to suppress the inrush current when switching to the next middle tap.

On the other hand, when the electromagnetic contactor 6-N is OFF,
Device 6-2 is turned on, and M1 self-electromagnetic contact? S 6-1 is 0FFL, the autotransformer 3 is connected to the 65% tap 3-2 of the intermediate tap, i'I electric contact gain 6-N is ONu, and similarly, the motor 1 has a total ratio of 42"lo' ) %i.

The pressure is applied and the magnetic contactor 6-N or the red switch is turned off.
Similarly, autotransformer 3 works as a reactor,
Suppressing the rush current, similar to the previous one, 6-3 turns on
L, electromagnetic contact 66-2 is OFF'L.

The electromagnetic contactor 6-N is ON, the magnetic contactor 6-N is OFF, and the oculomagnetic contactor 6-4 is ONL on the female body, and the magnetic contactor 6-3 or 0FFL, 80% tap 3-3. And all the pressure is on the ground! U demand I
K tel] is added and operation begins. Also'i *hate1
At the time of the interaction, the first tap 3-1 was used as a transformer, and the next tap 3-2 was used as a beam accelerator and switched to Il 1st, making the hats of two people! jYou can even drive while asleep. For example, after pressing the pushbutton 1 (not shown), the electrical connections 66-N and 6-1 are turned on (depending on whether they are connected to the autotransformer 3 or the 50% knob 3-1). n, electric (sl l is 25% of the total voltage
When the voltage is applied, the output terminal 6-N turns OFF after a few seconds, and in the unlikely event that the voltage transformer 3 acts as a reactor, the next tap 3-2 enters when the i'C is cut. At the same time as the current-suppressing power supply 46-N is turned OFF, the Kamehachi-cho Debut 6-2 switch is turned ON and connected to the autotransformer 3465% tap 3-2. , and then sequentially electromagnetic contactor 6-3.
t・ONL, -71- Todrance 3 remains as a reactor, and is heated until the output contactor 6-4h・0N-i- is completed 11
When the output contactor 6-4 is turned ON and full pressure is applied to the sleep motion control 1, the output contactor 6-1.6-2.6-3 is turned OFF and the motor 1 enters the operating state 6. It has become.

Also, in the example of Laughing Sadness in Figure 2, ('; l1, Nunobe ± 1
When starting, the first tap will turn deaf V+ as a transformer.
Due to the difference in the resistance value inserted between the taps 9 and 15 of the inkstone next time! v1's K yj Kyaete rush oil M [
It is possible to get up and drive with a certain amount of control. After inserting the ``Hige'' (1 Ki 1 Otsuzu Suinona (not shown))
, 6-1 or ONj, autotransformer 3ge5
0% tamp 3-1 is set to i or #, and all voltage is 0 to Fukaniso l.
) 25% voltage is applied υ[] to start, and after a few seconds the voltage &
B contactor 6-22 is ONL, magnetic gutter contactor 6-1 is OF'
FI,, resistance iR of resistor 5 is 1 [5] contactor 6-2 is O
Do N. At this time, the resistor 5 is used to suppress the inrush 143-1m when the next tap 3-2 is cut. In other words, when the 1st cicada stopper 6-2 is turned on, the autotransformer 3 contacts the 65'% tamp 3-2, and the contactor 6
-22 is 0FFL electric rock 1 vC is the total voltage υ) 42-
1 earth of 1v is marked 7JD. After that (dl n *i contact yis -23 is ONt, xi contact 16-22 is OF
l"L magnetic contactor 6-3 or ONL, autotransformer 3
(Switch to 80% tap 3-3.

Finally, the Kameda 66-4 turns ON, the Kamide-contactor 6-3 turns OFF, and the t-motor 1 enters the operating state. Condorfa hoisting using an autotransformer: Here, in order to limit the number of inrush currents, the potato tamp of the autotransformer is automatically switched and one jujube machine is operated in idle mode. As a result, it suppresses the rush during tap switching, limits the temporary power drop, and limits each power supply line.Even in Kusunoki, the start-up of the load of the highest load is OTN, which saves energy. It not only contributes to τ, but also ensures stable operation, and eliminates the conventional problems.

[Brief explanation of drawings]

The drawings do not show an embodiment of the method of the present invention; the first example is a circuit diagram, and FIG. 2 is a circuit diagram of another embodiment 1. 1...Electric motor, 2...Starter, 3...
...Auto transformer, 3-1.3-2.3-3...
...Tap, 4.6-N, 6-1 to 6-4.6-2
2.8-23...t4B contact @, 5...Resistor. Hayashi Kyoda Ganto Hayashi Public Company Ejokuchi 1

Claims (1)

[Claims] 1. In a method for starting an electric motor, in a Condorpha startup using an autotransformer including a damper, all taps of the autotransformer are automatically switched to limit inrush current. wfji 3 Features of dynamic operation and 1 How to start the electric motor. 2. The method for starting the motor according to claim 1, wherein, when switching the taps for starting the motor, a +a-order hitransactor is applied to each tap to switch to mating, and the inrush current is limited to start the motor. 3. When switching taps to start the generator, the first tap starts as a transformer, and the next tap sequentially switches as a beam accelerator to reduce the inrush current l5.
Claim 1, which operates while limiting It.
How to start the electric motor as described in section. 4. When changing the tap to start the motor, the first tap starts as a transformer, so the resistance between the next tap changes automatically switches the inrush current to limit the starting operation. A method for starting an electric motor according to claim 1.