KR100697075B1 - Speed Changeable Motor - Google Patents

Abstract

The present invention relates to a variable speed motor capable of expanding the high speed to low speed variable range of the motor without a separate driving device by switching at least one winding which forms the main winding and the auxiliary winding in series and parallel through a relay. In order to form a plurality of poles wound on the stator, primary windings and auxiliary windings in which first and second windings are formed, respectively, and the first and second windings and first and second auxiliary windings are switched in series and parallel, respectively. It is configured to include a relay to adjust the rotational speed of the motor, it is possible to greatly expand the rotational speed variable range of the motor and does not require a separate drive device for the variable speed production cost is reduced, In addition to greatly reducing the electromagnetic vibration noise generated during low speed control, the motor may be applied to a washing machine. It operates as a 12-pole motor in the stroke and a 4-pole motor in the dehydrating stroke to control the rotational speed of the motor through phase control and winding switching, so that the speed control of the motor can be efficiently performed and power consumption is high. The effect is greatly reduced.

Main winding, auxiliary winding, relay, switching, pole number conversion, abduction motor

Description

 Speed Changeable Motor

1 is an exploded perspective view showing an abduction type motor according to the present invention;

2 is a circuit diagram showing the connection of the main winding and the auxiliary winding in the variable speed motor according to the present invention,

3 is a graph showing a change in the dehydration speed according to the serial and parallel switching of the main winding and the auxiliary winding in the variable speed motor according to the present invention,

Figure 4 is a winding connection diagram for the number of poles of the variable speed motor according to the present invention.

<Explanation of symbols on main parts of the drawings>

L _M1 , L _M2 : Main winding L _S1 , L _S2 : Sub winding

B _M1 , B _M2 , B _S1 , B _S2 : Relay Box

The present invention provides a variable speed motor, in particular, by switching at least one or more windings forming the main winding and the auxiliary winding in parallel through a relay to expand the high to low speed variable range of the motor without a separate driving device. It relates to a variable speed motor.

In general, the single-phase induction motor has no starting torque because the alternating magnetic field is generated by the main winding, unlike the three-phase induction motor that naturally generates the rotating magnetic field, and thus the stopped single-phase motor cannot rotate by itself.

Therefore, a separate starting device for starting the motor is required. Such single-phase induction motors are relatively inefficient in terms of performance and cost compared to three-phase induction motors, but they are simple and easy to use. It is widely used in the apparatus which makes a

On the other hand, in the single-phase induction motor provided with a starting device, there is a case where a high speed rotation or a low speed rotation of the motor is required due to the operating characteristics of the device on which the motor is mounted.

In this case, when the single-phase AC power is applied and rotates, the current change of the supplied power is kept constant, and thus the speed change is limited. Therefore, a separate device for changing the speed of the motor should be provided. A robot three-phase motor, inverter circuit, or driver driver circuit were added.

However, there was a problem in that the production cost is increased according to the case of having a separate device as described above, alternatively to varying the speed of the motor by forming a separate tap winding in addition to the coil wound on the stator A method is proposed.

However, in the above method of varying the speed of the motor by using a tap winding, the variable range is quite limited to 2/3 of the synchronous speed of the motor, so that it is difficult to expand the speed range. have.

The present invention has been made in order to solve the above problems of the prior art, in the case of rotating the motor at high speed, the main winding and the auxiliary winding are connected in parallel, respectively, in the case of rotating at low speed, the main winding in series It is an object of the present invention to provide a variable speed motor that is configured to be able to greatly expand the speed variable range of the motor.

The variable speed motor according to the present invention for solving the above problems is the main winding and auxiliary windings each of which the first and second windings are formed to form a plurality of poles are wound on the stator, and the first and second windings And a relay to switch the first and second auxiliary windings in series and parallel to adjust the rotational speed of the motor, respectively.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. First, the speed variable motor according to the present invention is used for the abduction motor. 1 is an exploded perspective view showing an abduction type motor according to the present invention.

As shown in FIG. 1, the speed variable motor according to the present invention is an abduction type motor in which the rotor 2 is installed outside the stator 1 and is externally changed due to a change in the current flowing in the winding of the stator 1. Has a structure in which the rotor 2 rotates.

In the abduction type motor, since the rotor 2 is installed on the outside, the rotation radius is increased as compared with the electric type motor, and thus, the generation of torque per unit volume is relatively increased, thus starting torque without requiring an expensive starting device. Can be used for the use of a large load, it can be implemented more compact than the structure of the electric-proof motor when the generation of the same torque is required.

2 is a circuit diagram showing the connection of the main winding and the auxiliary winding in the variable speed motor according to the present invention, Figure 2a is a circuit diagram showing the connection of the main winding and the auxiliary winding as a whole, Figure 2b is the main winding and the auxiliary 2C is a circuit diagram when the windings are connected in parallel, respectively, and FIG. 2C is a circuit diagram when the first main winding and the second main winding are connected in series and are connected in parallel with the auxiliary winding.

First, in the variable speed motor according to the present invention, the main winding wound on the stator 1 has two windings each forming poles on the stator 1 and winding the coil in the opposite direction, thereby providing a single-phase AC power source. When it is applied, the direction of the electric current to form the adjacent poles is reversed so that the magnetic polarity generated thereby alternately shows the N pole and the S pole.

The motor may further include an auxiliary winding L _{S in} addition to the main winding L _M in the stator to generate a rotation torque.

That is, the motor has an alternating magnetic field generated in the main winding L _M when the single-phase AC power is applied. However, since the motor does not rotate by the generation of the alternating magnetic field, the auxiliary winding L _S is the capacitor. According to the operation of the main winding (L _M ) to form an auxiliary magnetic field having an electrical phase difference of 90 degrees, the magnetic field does not cancel each other by the phase difference between the auxiliary magnetic field and the alternating magnetic field, thereby generating a rotating magnetic field To rotate the induction motor.

In addition, the variable speed motor according to the present invention, the first, second winding (L _M1 , L _M2 ) and the first, second auxiliary winding for forming the main winding (L _M ) and the auxiliary winding (L _S ) It is comprised including (L _S1 , L _S2 ).

As shown in FIG. 2A, the first and second main windings L _M1 and L _M2 and the first and second auxiliary windings L _S1 and L _S2 may be connected and switched through a relay. It comprises at least one relay box (B _M1 , B _M2 , B _S1 , B _S2 ), the overall main winding (L _M ) and auxiliary winding (L _S ) is also the relay box (B _M1 , B _M2 , B) _S1 , B _S2 ) can be connected in series or in parallel.

In this case, the relay box (B _M1 , B _M2 , B _S1 , B _S2 ) is connected to the main winding (L _M ) and auxiliary by selectively connecting the terminals of each circuit to which the box is connected by a relay provided separately from the outside. Allow winding L _S to be switched in series or parallel.

Accordingly, as shown in FIG. 2C, the first and second main windings L _M1 and L _M2 and the first and second auxiliary windings L _S1 and L _S2 are connected in parallel through the relay. When the single-phase AC voltage applied to the stator is 220V, the voltage across the first and second windings L _M1 and L _M2 and the first and second auxiliary windings L _S1 and L _S2 is 220V. A magnetic field is formed, and the motor rotates.

In addition, as shown in FIG. 2B, when the first and second main windings L _M1 and L _M2 are connected in series, the first and second main windings L _M1 and L _{M2 are} disposed over the entirety of the first and second main windings L _M1 and L _M2 . 220V is applied and the voltage applied to each main winding is 110V, and thus the rotation speed of the motor is variable.

This will be described in more detail with an example.

When an AC voltage is applied to the circuit and the relay connects the main winding and the auxiliary winding in series and parallel, the motor satisfies the following equation.

V = 4.44 * f * Φ * N

(V is the magnitude of the voltage applied to both ends of the motor stator winding, f is the frequency of the power applied to the motor, Φ is the magnetic flux generated in the motor, N is the number of turns of the winding wound on the stator). )

That is, since the magnetic flux generated in the motor is a voltage applied to both ends of each coil wound on the motor stator, the first and second main / secondary windings L _M1 , L _M2, L _S1 , L by the relay. _{When the S2} ) is connected in parallel is increased in proportion to a certain number compared to the case where the series is connected, the rotational speed of the motor is also greatly increased accordingly.

The variable speed motor according to the present invention can be applied to a machine such as a washing machine, a dishwasher, which requires shifting, and in a washing operation or a dehydration operation, it is required to vary the speed of the motor from high speed to low speed or low speed to high speed. .

3 is a graph showing a change in the dehydration speed of the variable speed motor according to the present invention according to the parallel winding of the main winding and the auxiliary winding.

That is, the graph is a graph showing the relationship between the rotational speed and the rotational torque of the motor through the serial / parallel switching of the variable speed motor according to the present invention, the main winding and the auxiliary winding is connected in series, in parallel The load curve of the motor applied to the washing machine is shown together.

Therefore, as shown in FIG. 3, in the case where the motor is applied to the washing machine and the dehydration stroke is performed, the main winding of the motor by the operation of a relay when the motor is to be rotated at high speed for the high speed dehydration stroke. When the auxiliary winding is connected in parallel, the motor rotates at the speed S1 at the point where the rotation torque curve A and the load curve L intersect in parallel connection.

In addition, when the motor is to be rotated at low speed for low speed dehydration stroke, when the main winding and the auxiliary winding of the motor are connected in series by the operation of the relay, the rotation torque curve B and the load curve at the time of series connection The motor is rotated at the speed S2 at the point where L) intersects, so that the speed of the motor can be largely changed from high speed to low speed.

On the other hand, the variable speed motor according to the present invention is operated so that the four poles and 12 poles are separately wound and the number of poles is converted according to the stroke operation of the washing machine.

4 is a winding connection diagram of the pole number conversion of the variable speed motor according to the present invention.

That is, the speed variable motor according to the present invention operates as a motor wound with 12 poles (a) in the case of a washing stroke requiring low speed and high torque, and in the case of a dehydrating stroke of high speed / high torque or low speed / low torque. By operating as the four-pole motor (b) described above, the speed of the motor can be largely changed according to the serial / parallel switching of the main winding and the auxiliary winding wound as the four-pole motor (b).

In addition, when operating as a 12-pole motor (b) a plurality of poles are formed to reduce the speed controllability by the main winding and auxiliary windings to change the speed through the phase control of the input power applied to the motor. .

Therefore, the variable speed motor according to the present invention is an abduction type motor in which four poles and twelve poles are formed, respectively, and main and auxiliary windings forming four poles are switched in series / parallel by a relay to greatly increase the speed variable range of the motor. It is possible to enlarge and maximize the effect of reducing power consumption by operating as a 12-pole motor through pole number conversion.

As described above, the variable speed motor according to the present invention has been described with reference to the illustrated drawings. However, the present invention is not limited by the embodiments and the drawings disclosed herein, and a main winding that uses a pole number modified motor and forms a pole And the technical idea of the present invention to greatly increase the speed variability of the motor by switching the connection of the auxiliary winding can be easily applied by those skilled in the art within the scope of protection.

The variable speed motor according to the present invention configured as described above can greatly expand the rotational speed variable range of the motor by switching the connection of the main winding and the auxiliary winding forming the poles in series / parallel through a relay, and the speed is variable. There is no need for a separate drive device for the production cost is reduced, there is an effect that the electromagnetic vibration noise generated during low-speed control of the motor is greatly reduced.

Particularly, when the motor is applied to a washing machine, the motor operates as a 12-pole motor in the washing stroke and a 4-pole motor in the dehydrating stroke to control the rotational speed of the motor through phase control and winding switching. Speed control can be made efficiently and the power consumption is greatly reduced.

Claims (5)

In single phase induction motor, First and second windings wound around the stator; First and second auxiliary windings wound around the stator; The first and second main windings and the first and second auxiliary windings are configured to include a relay for changing the rotational speed range of the motor by switching so as to be connected in series and parallel respectively, And the first and second main windings and the first and second windings are wound with at least two types of turns on the stator such that at least two poles are formed in the single-phase induction motor. The method of claim 1, The variable speed motor is a variable speed motor, characterized in that the pole number is converted according to the washing process. The method of claim 1, And the first and second main windings and the first and second auxiliary windings are wound to form four poles and twelve poles in the variable speed motor. The method of claim 3, wherein The speed variable motor operates as a 12-pole motor when the washing stroke, and operates as a 4-pole motor when dehydrating. The method of claim 1, The relay connects the first and second main windings and the first and the second auxiliary windings in parallel when the speed variable motor rotates at high speed, and the first and second main windings in series when the motor rotates at low speed. Variable speed motor, characterized in that for connecting.

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