KR20010016492A - Method for raising efficiency of single phase induction motor and detecting operation completion - Google Patents

Abstract

PURPOSE: A method for raising efficiency of a single phase induction motor and detecting the operation completion is provided to improve the output of a motor by using an operation winding and the armature reaction. CONSTITUTION: If the operation of a motor is started and the rotational number is over a predetermined value, a centrifugal switch operated by the centrifugal force is operated and the operation winding and a condenser are separated from a circuit. When the motor is operated, the current is not flowed in the operation winding. When the motor is operated, condensers(c1,c2) are operated together. If the operation switch is operated, the condenser(c2) is separated from the circuit, and the current according to the condenser(c1) is flowed through the motor.

Description

Method for increasing efficiency and starting completion of a single-phase induction motor.

The present invention is a single-phase induction motor that is used as a general industrial power, it requires a lot of initial starting power, has a built-in centrifugal switch for starting, and the winding of the motor is composed of a main winding and a starting winding. The motor is driven by the magnetic flux produced by a starting winding with an electrical phase difference of 90 ° C. If the mover of the centrifugal switch attached to the rotor of the motor is operated by centrifugal force to open the centrifugal switch (OPEN) before the motor starts and reaches the registered speed, the start winding connected to the centrifugal switch stops. The motor will continue to run only by the main winding.

If the power supply is cut off, the centrifugal switch will be attached to the original state.

In the conventional motor, the centrifugal switch is fixed to the shaft of the motor, which limits the size of the motor in the longitudinal direction, and the efficiency is much lower than that of the three-phase induction motor, which is a problem for the consumer to select.

In addition, there was a limit to reduce the electrical noise because it operates only with the main winding.

At the same time, single-phase induction motors were much heavier than three-phase induction motors.

The present invention seeks to improve these.

Representative drawing: It shows the schematic diagram of the motor and the internal structure diagram of the condenser and relay installation box.

Circuit diagram [FIG. 1]: conventional circuit

2: Circuit diagram using the present patent while using a centrifugal switch.

Fig. 3 is a circuit diagram of the present patent with a relay operating by the voltage of the start winding.

Fig. 4 is a circuit diagram of this patent with a relay operated by a voltage at startup applied to a capacitor.

[Fig 5]: The relay is operated by the voltage appearing at the start winding at the start, and the operation is connected by connecting two capacitors in series, and the impedance for flowing the discharge current of the charged c ₃ capacitor is attached.

① The main theory of the present invention has been interpreted that the armature reaction only appears in the direct current, such as a direct current motor, a generator or a synchronous motor, the present invention, the present invention, the armature reaction also appears in the induction motor and among the many phenomena of this armature reaction When the forward current flows, it increases the output by increasing the main magnetic flux, increasing the efficiency and increasing the power factor at a constant output, and reducing the loss on the power supply with the lower input current.

② The present invention is applied to a single phase induction motor, that is, a motor having a centrifugal switch, which is frequently used as a power source for industrial and small machinery and farming and fishing villages.

Now, the single phase induction motor is the same circuit as [Figure 1].

In other words, when the motor starts to start and rises above a certain speed, the centrifugal switch operated by centrifugal force operates, and the starting winding and the condenser are separated from the circuit, and no current flows in the starting winding during operation.

However, in the present invention, when the capacitor is placed in multiple stages and the c ₁ and c ₂ capacitors are operated at the same time as shown in FIG. 2, the c ₂ is separated from the circuit if the start switch is opened according to the starting condition. And current according to c ₁ condenser flows to the motor, and the phase current flows in the starting winding during operation, which causes the increase of steam.

③ The main winding and the starting winding are inserted into the throat of the iron core so as to have a phase difference of 90 ° C. So the magnetic flux by the sovereignty is not offset by each other in the maneuverable winding. However, the main winding and the rotor winding, the rotor winding and the starting winding act as transformers, and if the condenser is connected to the starting winding to flow the forward current, the forward current flows to the rotor and causes a boost.

④ When the rotor of the motor starts to rotate and gain the rotational force, the magnetic flux is generated according to the current flowing in the rotor winding. The magnetic flux is induced to the starting winding, and the faster the rotation, the higher the voltage appearing on the starting winding.

When the motor closes to the synchronous speed and completes the start, the voltage of the start winding becomes constant. In this way, the voltage (rotation voltage) corresponding to the rotation speed is displayed on the start winding. That is, the rotation voltage appearing at the start winding is low at the start, gradually increases during the start, and becomes constant when the start is completed.

⑤ The motor's output is proportional to the square of the magnetic flux by using the starting winding, which has been started but not used in the past, while the forward current flows during operation. Therefore, the output of the motor increases according to the increase of the torque. This reduces the rotor resistance loss. In addition, the current flowing in the main winding also decreases, which is greater than the increase in resistance loss generated in the starting winding, resulting in increased efficiency.

⑥ The rotation voltage can be adjusted according to the number of turns of the starting winding. The voltage applied to the start winding and the capacitor varies depending on the number of turns, the power supply voltage and the capacitor capacity. Therefore, it detects the rotation voltage appearing on the starting winding or condenser and connects a relay that operates to this voltage and can be used as a starting relay instead of a centrifugal switch.

The motor's output was increased by using the increase of the armature reaction by using the starting winding that was not used during the operation of the single-phase induction motor.

This results in the following effects:

① output increases in the same structure

② Loss decreases at the same output, resulting in a high efficiency motor.

③ The load current decreases, so the loss of the line is reduced.

④ Energy consumption is reduced.

⑤ It can reduce the size of the motor in the longitudinal direction by removing the centrifugal switch and using the relay by detecting the rotation voltage by the reaction of the armature.

⑥ It can increase the volume of motor with ⑤ by reducing iron core.

Claims (2)

Multi-stage condenser starting and operation single phase induction motor that increases efficiency by the action of armature by using the starting winding of condenser starting single phase induction motor during operation. Multi-phase capacitor start and operation single-phase induction motor replacing the existing centrifugal switch by operating relay with voltage shown on starting winding or capacitor connected to starting winding by the armature reaction of paragraph 1.