KR20080087967A

KR20080087967A - A motor

Info

Publication number: KR20080087967A
Application number: KR1020070030210A
Authority: KR
Inventors: 이원용
Original assignee: 엘지전자 주식회사
Priority date: 2007-03-28
Filing date: 2007-03-28
Publication date: 2008-10-02

Abstract

A motor is provided to reduce material cost by reducing the number of coils without necessity of increasing a thickness of a stator to equalize magnetic flux density to that of a motor rotating in one direction. A motor includes a stator, a rotor, and a switching unit(RY1). The stator is wound with coils. The rotor rotates around the stator. The coils include a main winding(MAIN) connected to power and a sub winding(SUB) connected to the power in parallel with the main winding. The switching unit switches a direction of current flowing in the sub winding in correspondence to a rotation direction of the rotor. The switching unit is a reverse relay to switch a start end and a terminal end of the sub winding to each other.

Description

Motor {A motor}

1 is a circuit diagram showing a connection of a conventional motor.

2 is a conceptual diagram showing the structure of a motor according to the present invention.

3 is a circuit diagram showing the connection of the motor according to the present invention.

Figure 4 is a first circuit diagram showing the connection of the switching unit of the motor according to the present invention.

5 is a second circuit diagram showing the connection of the switching unit of the motor according to the present invention.

The present invention relates to a motor, and more particularly, to a motor manufactured to enable forward rotation or reverse rotation.

In general, laundry that is completed washing is transported to a drying machine to perform natural drying. In the case of rainy season or irregular weather, natural drying of the laundry is delayed, causing a lot of inconveniences for busy modern people.

Accordingly, a device capable of drying laundry regardless of the weather has been required, and thus the developed device is a clothes dryer.

The clothes dryer is in a trend of increasing demand for busy modern people.

In addition, the clothes dryer is a device configured to heat dry air by heating means, and then blow the dry air into a drum to evaporate the moisture of the object to be dried.

Like the washing machine, the clothes dryer is provided with a motor that rotates the drum to dehydrate or evenly mix the drying objects.

Referring to Figure 1, the connection of the conventional dryer motor is as follows.

Here, a single-phase induction motor having two auxiliary windings in opposite directions in which the windings are wound and capable of rotating the rotor in a direction selected from forward and reverse directions will be described.

First, the main winding MAIN is connected in series to a power source, and the first and second auxiliary windings SUB1 and SUB2 are connected in parallel to the main winding. The auxiliary windings are preferably wound and overlapped in the same manner.

The conventional induction motor may control the rotation direction of the motor by applying power only to one of two auxiliary windings. When power is applied to the second auxiliary winding SUB2, the rotor of the motor rotates in a clockwise direction, and when power is applied to the first auxiliary winding SUB1, it may rotate in a counterclockwise direction.

In general, the centrifugal switch (C / SW) is connected in series with the first and second auxiliary windings, and when the rotational speed of the rotor reaches 75 percent of the rated speed, the contact is turned off to operate only the main winding.

In addition, the motor is preferably provided with a circuit protection device such as OLP (POP) between the power supply and the coil for the purpose of preventing overcurrent flow in the circuit or fire due to overheating.

However, in the conventional induction motor, the slot size of the stator core is constant in order to rotate in both directions, but it is difficult to insert the winding because two auxiliary windings must be wound.

In addition, since two auxiliary windings are wound around the stator core, the magnetic flux density is inevitably lowered, so that more steel sheets must be laminated to the stator core in order to exhibit equivalent performance to a motor rotating only in one direction. Therefore, the stacking height of the stator core is increased and the number of auxiliary windings is increased compared to the motor which can rotate only in one direction, thereby increasing the material cost.

The present invention is to solve the above problems, an object of the present invention is to provide a motor that is easy to manufacture by reducing the number of parts inside the motor and the required space.

In order to achieve the above object, the present invention includes a stator in which a coil is wound and a rotor that rotates with respect to the stator, wherein the coil includes a main winding connected to a power source and the power supply in parallel with the main winding. It comprises a connected auxiliary winding, and provides a motor comprising a switching unit for switching the direction of the current flowing in the auxiliary winding corresponding to the rotation direction of the rotor.

In this case, the auxiliary winding is one auxiliary winding connected in parallel with the main winding.

The switching unit is a reverse relay for switching the start end and the end of the auxiliary winding connected to the main winding with each other.

In addition, the reverse relay is provided outside the bracket forming the appearance of the motor.

On the other hand, the motor according to the invention further comprises a connector for connecting the start and end of the auxiliary winding to the reverse relay.

A centrifugal switch is connected in series with the auxiliary winding, and a capacitor is connected in series with the centrifugal switch.

In addition, the auxiliary winding is characterized in that the capacitor is connected in series.

The motor according to the invention is preferably used in a dryer.

Therefore, the motor according to the present invention has only one auxiliary winding to facilitate winding the winding and does not need to increase the thickness of the stator.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

Referring to Figure 2 and 3 will be described the structure of the motor according to the present invention.

Figure 2 is a plan view showing the structure of the winding of the motor according to the present invention, Figure 3 is a circuit diagram showing the connection of the motor according to the present invention.

The motor according to the present invention is provided with only one main winding and one auxiliary winding. In FIG. 2, the main line MAIN is indicated by a solid line and the dotted line corresponds to the sub winding SUB. At this time, the main winding is connected to one, but if the current flows, each of the coils are wound in polarity and can operate as a multi-pole motor. It can be seen in the drawing that the auxiliary winding is wound in the same manner.

Referring to Figure 3 describes the wiring of the motor according to the present invention.

First, the main winding is connected in series with the power supply, and the auxiliary winding is also connected in series with the power supply and in parallel with the main winding.

In addition, the centrifugal switch (C / SW) for controlling the power supply of the auxiliary winding is preferably connected in series with the auxiliary winding.

In addition, it is preferable to connect the capacitor C1 in series with the centrifugal switch. At this time, it is preferable that a conductive line connecting the power supply and the centrifugal switch is provided and connected in parallel with the capacitor C1.

The capacitor C1 is in a state of charging current and shutting off the power when the power is applied, and has a characteristic of discharging the current when the contact of one side of the capacitor C1 is turned off.

When power is applied to the auxiliary winding, the rotation direction of the rotor is determined by the phase difference between the main winding and the auxiliary winding. Both ends of the main winding and the auxiliary winding is preferably connected to a wire having a specific color to prevent confusion of the wiring as shown in the figure. When the black (BK) line of the auxiliary winding is connected to the main winding side and the red (RD) color line of the auxiliary winding is connected to the centrifugal switch side as shown in ①, the rotor starts to rotate due to the magnetic field formed by the auxiliary winding. And, if the red line is connected to the main winding side and the black line is connected to the winshim switch side as in ②, the direction of the current flowing through the auxiliary winding is reversed. Start the rotation.

The centrifugal switch is initially turned on, and the capacitor C1 of the motor stores electricity when the centrifugal switch is turned on.

When the motor accelerates and reaches a certain level of the rated speed, the centrifugal switch is turned off, and as soon as the centrifugal switch is turned off, the electric current stored in the capacitor C1 connected in series with the centrifugal switch increases the torque of the motor.

Therefore, the motor according to the present invention includes a capacitor C1, and after a certain time, a magnetic field is formed by the current input from the capacitor C1 without applying power to the auxiliary winding side, thereby improving the efficiency of the motor.

It is preferable that the motor according to the present invention includes a switching section RY1 for switching the polarity of the current applied to the coil. As the switching unit RY1, it is most preferable to select a reverse relay that can be easily controlled by a microcomputer. It is preferable to use the reverse relay as having a large capacity in case of a large current used in the motor.

Since the motor is generally used in a system requiring a driving force, it is preferable that the motor is small in assembly and use. Therefore, since it is difficult to provide the said switching part RY1 which did not exist in the inside of a motor conventionally, it is preferable to provide the said switching part RY1 outside the motor. In addition, the switching unit RY1 is preferably connected through a separate wire so as to be electrically connected to the components inside the motor.

4 and 5 are circuit diagrams showing the connection of the switching unit of the motor according to the present invention.

In the motor, terminals 2 and 3 of the switching unit RY1 are connected to the auxiliary winding through a connector, the terminal 4 is connected to the main winding through a connector, and the terminal 1 is the contact point (a) of the centrifugal switch. ) Can be connected.

At this time, the contacts 3, 6 of the switching unit RY1 can be selectively connected to the contacts 4, 5 or the contacts 2, 7 by the control signal of the microcomputer.

In the centrifugal switch, the contact point a may be connected to the contact point b to supply power to the auxiliary winding or to the contact point c to discharge the current of the capacitor C1 according to the rotational speed of the rotor.

Referring to the operation of the motor according to the present invention.

As shown in Fig. 4, when the two contacts 6 and 9 of the switching unit RY1 are switched by the control signal of the microcomputer and connected to the contacts 5 and 8, respectively, the black (BK) line of the auxiliary winding is connected to the centrifugal switch. The red (RD) line is connected to the main winding side and the motor starts to rotate.

The motor starts to rotate and the centrifugal switch is turned off when the rotational speed reaches a predetermined speed (75 percent of the rated speed), thereby increasing the rotational torque of the motor while the current stored in the capacitor C1 is discharged.

On the other hand, when the two contacts 6 and 9 of the switching unit RY1 are connected to the contacts 4 and 7, respectively, as shown in FIG. 5, the red (RD) line of the auxiliary winding is connected to the centrifugal switch, and the black (BK) line is the sovereignty. It is connected to the ship side. At this time, if the rotation direction in the above case is the forward direction, the motor starts to rotate in the reverse direction.

Similarly, in the motor, when the contact point a of the centrifugal switch is connected to the contact point b, the contact point a of the centrifugal switch is connected to the contact point c when the rotational speed of the motor reaches 75 percent of the rated speed. . Therefore, the auxiliary winding is disconnected from the power source and generates rotational torque by the current discharged from the capacitor C1.

Therefore, since the motor according to the present invention does not need to have two coils to rotate in both directions, the size of the motor can be kept constant and the work of winding the coil is simple.

The present invention is not limited to the above-described embodiments, and can be modified by those skilled in the art as can be seen from the appended claims, and such modifications are within the scope of the present invention. .

Referring to the effect of the motor according to the invention as follows.

First, since only one auxiliary winding is provided in the conventional motor, which requires two auxiliary windings, it is easy to wind a coil on the stator.

Second, it is not necessary to increase the thickness of the stator for the purpose of equalizing the strength of the magnetic field, and the number of coils can be reduced, thereby reducing the material cost.

Claims

In a motor comprising a stator in which a coil is wound and a rotor that rotates with respect to the stator,

The coil includes a main winding connected to a power supply and an auxiliary winding connected to the power supply in parallel with the main winding,

And a switching unit for switching the direction of the current flowing in the auxiliary winding in correspondence with the rotation direction of the rotor.

The method of claim 1,

And the auxiliary winding is one auxiliary winding connected in parallel with the main winding.

The method of claim 2,

The switching unit is a motor, characterized in that the reverse relay for switching between the start end and the end of the auxiliary winding connected to the main winding.

The method of claim 3, wherein

The reverse relay is a motor, characterized in that provided on the outside of the bracket forming the appearance of the motor.

The method of claim 3, wherein

And a connector connecting the start end and the end of the auxiliary winding to the reverse relay.

The method of claim 2,

And a centrifugal switch is connected in series with said auxiliary winding.

The method of claim 6,

And a capacitor is connected in series with the centrifugal switch.

The method of claim 7, wherein

And a capacitor is connected in series with the auxiliary winding.

The method of claim 1,

The motor is characterized in that the motor for drum rotation of the dryer.