KR20020009906A - Pole change motor - Google Patents

Abstract

PURPOSE: A pole change motor is provided to achieve an improved operating efficiency of the motor by connecting a compensation coil in serial to the main coil, while reducing power consumption and noise. CONSTITUTION: A pole change motor comprises a rotor; a stator including first to fourth main coils(M1 to M4) which operate in two or four poles and generate a starting torque for the rotor, and first and second main compensation coils(MC1,MC2) connected in serial to first to fourth main coils so as to compensate for the abnormality of magnetic field between adjacent coils of the same polarity, from among first to fourth main coils, during operation in two poles; and a relay unit(12) for converting the polarity of first to fourth main coils into two or four poles, and switching the connection state of first and second main compensation coils.

Description

Pole CHANGE MOTOR

The present invention relates to a motor for a compressor, and more particularly to a pole conversion motor for a compressor.

Generally, a compressor is a device that compresses a refrigerant by using a rotational force of an internal motor, and is used in a refrigerator, an air conditioner, and the like.

In particular, the compressor motor applied to the refrigerator is made of a stator and a rotor of two poles (N / S), as shown in Figure 1, but can vary only depending on product characteristics, but constant speed operation (for example, 3600rpm) is possible. .

On the other hand, the refrigerator has a rapid cooling mode and a standard operation mode as a typical operation mode, the actual time of operation in the rapid cooling mode is less than 10% of the actual use time, other times are operated in the standard operation mode.

At this time, in the rapid cooling mode, the temperature range to be adjusted is large. Therefore, the motor must be operated at a fixed speed, that is, at a high speed, so that rapid cooling is achieved. However, in the standard operation mode, the high temperature range is not so large. It only adversely affects noise, increased power consumption and overwhelms the product.

Nevertheless, in actual refrigerators, the compressor motor is operated at a high speed according to the rapid cooling mode regardless of the operation mode.

In other words, as shown in FIG. 2, the device operates only at a single speed and operates at a set temperature through full duty in the rapid operation mode and duty ratio control for each temperature in the standard operation mode. It is to operate in standard operation mode after stabilizing load temperature through rapid operation.

As described above, the compressor motor according to the prior art is driven at a high speed regardless of the operation mode, so the power consumption is large and noise is generated a lot, and the frequent on / off causes a problem in shortening the product life. There is this.

The present invention has been made to solve such a problem, by connecting the compensation winding in series with the main winding in order to improve the operation efficiency and to enable low-speed / high-speed operation according to the operation mode to reduce power consumption and noise and shorten the product life It is an object of the present invention to provide a pole conversion motor for a compressor to prevent the damage.

1 is a view showing a motor for a compressor according to the prior art

2 is a graph showing the relationship between the rotational speed and load of a compressor motor according to the prior art.

3 is a view showing a pole conversion motor for a compressor according to the present invention

4 is a view showing the winding form when the two-pole driving of the pole conversion motor for a compressor according to the present invention

5 is a circuit diagram showing a detailed configuration of the two-pole driving of the pole conversion motor for a compressor according to the present invention

Explanation of symbols for main parts of the drawings

12: relay section M1 to M4: main winding

MC1, MC2: main compensation winding RY1, RY2: first and second relay

The pole conversion motor according to the present invention for achieving the above object is the rotor and the first to fourth main winding, the second pole to operate the two poles or four poles to generate the starting torque of the rotor A stator including first and second main compensation windings connected in series with the first to fourth main windings to compensate for magnetic field abnormalities between adjacent windings of the same polarity among the first to fourth main windings, the first And a relay unit for changing the polarity of the fourth main winding to two or four poles and switching the connection state of the first and second main compensation windings.

Hereinafter, the pole conversion motor according to the present invention will be described in more detail with reference to the accompanying drawings.

Figure 3 is a view showing a pole conversion motor for a compressor according to the present invention, Figure 4 is a view showing the winding form during the two-pole drive of the pole conversion motor for a compressor according to the present invention, Figure 5 is a compression according to the present invention It is a figure which shows the circuit at the time of 2-pole driving of a conventional pole conversion motor.

As shown in FIG. 3, the pole change motor for a compressor according to the present invention includes a rotor and a stator for performing high speed / low speed operation of the motor through pole change (2 poles / 4 poles).

The configuration of the pole conversion motor for a compressor according to the present invention will be described with reference to Figs. 4 and 5, the first to the fourth winding for generating a starting torque of the rotor (not shown) by operating in two or four poles The first to fourth main windings M1 to M4 to compensate for magnetic field abnormalities due to the same polarity adjacent to the lines M1 to M4 and the first to fourth main windings M1 to M4 during two-pole operation. ) And the first and second main windings (MC1, MC2) and the first to fourth main windings (M1 to M4) and the first and second according to the detection result of the difference between the internal temperature and the set temperature The relay unit 12 is configured to switch the connection state of the main compensation windings MC1 and MC2 and to convert the polarity of the first to fourth main windings M1 to M4 into two or four poles.

Referring to the operation of the pole conversion motor for a compressor according to the present invention configured as described above is as follows.

First, when the detection result of the difference between the internal temperature and the set temperature is detected to be higher than a predetermined value, that is, when the temperature detection result of the temperature sensor (not shown) indicates that the device, for example, the refrigerator needs to be operated in the rapid cooling mode, Since it must be driven at high speed, the pole conversion motor for the compressor should be operated two poles.

In this case, the relay unit 12 is designed to have a circuit connection configuration in which all the contacts are 'on' so that the motor can operate in two poles when the temperature detection result requires the rapid cooling mode by operating in conjunction with the temperature sensor. Designed to have a circuit-connected configuration where all contacts are 'off' to allow the motor to operate on four poles when no fast cooling mode is required.

At this time, the relay unit 12 series the first and second main compensation windings MC1 and MC2 between the first and fourth main windings M1 and M4 and the second and third main windings M2 and M3. At the same time, the first to fourth main windings M1 to M4 are converted into two poles, or the first and fourth main compensation windings MC1 and MC2 are disconnected from each other. A plurality of first and second relays RY1 and RY2 for serially connecting the main windings M1 and M4 and the second and third main windings M2 and M3.

Therefore, as shown in FIG. 4, all the contacts of the relay unit 12 are switched to an 'on' state, and thus, between the first and fourth main windings M1 and M4 and the second and third main windings M2 and M3. First and second main compensation windings MC1 and MC2 are connected in series.

In addition, current flows from the power supply to each winding to have the polarity of 'N-N-S-S' in the order of the first to fourth main windings M1 to M4, that is, 'M1-M2-M3-M4'.

In addition, the first main compensation winding MC1 has an 'N pole' having the same polarity as the first main winding M1 and the second main winding M2, and the second main compensation winding MC2 has a third main winding ( M3) and the fourth main winding M4 have the same polarity as the 'S pole'.

Subsequently, rotation of the rotor is started by the starting torque of the first to fourth main windings M1 to M4 generated by receiving power, and the motor is driven at high speed by two poles.

Therefore, an external speed sensor (not shown) detects a predetermined number of revolutions (for example, 3600 rpm) and repeats the on / off of the motor to maintain the speed.

In this case, when the motor operates in two poles, since the first main winding M1 and the second main winding M2 have an 'N pole', the space magnetic flux distribution for which a 'S pole' is forcibly generated in the space therebetween Since the first main compensation winding MC1 exhibits the 'N pole', the 'S pole' component is canceled to compensate for the abnormality of the spatial magnetic flux distribution.

In addition, since the third main winding M3 and the fourth main winding M4 have a 'S pole', an abnormality in the spatial magnetic flux distribution to generate 'N pole' is forcibly generated in the space therebetween. Since the main compensation winding MC2 exhibits the 'S pole', the 'N pole' component is canceled to compensate for the abnormality of the spatial magnetic flux distribution.

In addition, all the contacts of the relay unit 12 are switched to an 'off' state, and thus, the first and fourth main windings M1 and M4 and the second and third main windings M2 and M3 are connected in series. And the second main compensation windings MC1 and MC2 are disconnected.

In the first and fourth main windings M1 and M4, current flows in the same direction as in the two-pole operation, and maintains the same polarity, whereas the second and third main windings M2 and M3 reverse the flow of current. Therefore, the polarity is also reversed so that the first to fourth main windings (M1 to M4) have the order of 'NSN-S' in the order of 'M1-M2-M3-M4'. do.

Subsequently, the rotation of the rotor is started by the starting torque of the first to fourth main windings M1 to M4 supplied with power, and the motor is driven at low speed to four poles.

Therefore, an external speed sensor (not shown) detects a predetermined number of revolutions (for example, 1800 rpm) and repeats the on / off of the motor to maintain the speed.

In this case, when the motor operates with four poles, the first to fourth main windings M1 to M4 do not need the first and second main compensation windings MC1 and MC2 because windings adjacent to each other have opposite polarities. .

For example, since the first main winding M1 has an 'N pole' and the second main winding M2 has an 'S pole', there is no abnormality in the spatial flux distribution in the space therebetween, and thus the first main winding M1 has a 'N pole'. The compensating winding MC1 is not necessary, and the second main compensation winding MC2 is also unnecessary for the above-described reason.

Therefore, when the motor is operated with four poles, the connection state of the first and second main compensation windings MC1 and MC2 is released.

Therefore, when the load is large, that is, when it is necessary to operate in the rapid cooling mode, the motor is operated at 2 poles high speed to achieve rapid cooling. It is configured to allow efficient cooling.

As described above, the pole conversion motor according to the present invention has the following effects.

First, it is possible to improve the operation efficiency of the pole conversion motor by connecting the compensation winding to the main winding in series to prevent deterioration or abnormal operation characteristics of the two-pole operation.

Second, low speed / high speed operation is possible according to the operation mode, which can reduce power consumption and noise and prevent product life.

Third, as the load increases and decreases, the winding current increases and decreases, and accordingly, the opposite pole occurring between the windings increases. At this time, the current flowing through the compensation winding also increases and decreases with the same current, so that the opposite pole can be offset so that the compensation efficiency can be improved. Can be.

Claims (4)

Rotor; Compensating for magnetic field abnormalities between adjacent windings of the same polarity among the first to fourth main windings for operating starting torque of the rotor by operating in two or four poles, and the first to fourth main windings in two-pole operation. A stator including first and second main compensation windings connected in series with the first to fourth main windings; And, And a relay unit configured to change the polarity of the first to fourth main windings to two or four poles and to switch the connection state of the first and second main compensation windings. The method of claim 1, And the first and second main compensation windings are located between adjacent windings of the same polarity among the first to fourth main windings during the two-pole operation of the motor. The method of claim 1, And the first and second main compensation windings are connected in series between the first and fourth main windings in a two-pole operation of the motor. The method of claim 1, The method of claim 1, The relay unit connects the first and second main windings in series between the first and fourth main windings and the second and third main windings, and simultaneously converts the first to fourth main windings into two poles. For disconnecting the first and second main compensation windings, connecting the first and fourth main windings and the second and third main windings in series, and simultaneously converting the first to fourth main windings into four poles. Polar conversion motor, characterized in that consisting of the first and second relay.