JPH11252975A - Motor, power generator, and electric washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the temperature of a motor from exceeding a prescribed one, even if the motor is heated by an overload or the like. SOLUTION: This motor is provided with a first object involving a three- phase winding which consists of a first winding 2u, second winding 2v, and third winding 2w, and a second object rotatably retained for the first object, in which the first fusing means 6 is inserted into the first winding 2u in series, and a second fusing means 7 is inserted in the second winding 2v in series, thereby supplying three-phase electric power to a three-phase winding 2 via the first fusing means 6 and the second fusing means 7. The ratings of the prescribed temperature at which the first fusing means 6 and the second fusing means 7 are fused are the same. If the three-phase winding 2 rises due to overcurrent, the first fusing means 6 and the second fusing means 7 are fused sequentially to have the motor stopped. The motor is driven by an inverter, to serve as a power generator, and used for electric washing machines to improve safety.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor and a power generator used for consumer and industrial equipment, and to an electric washing machine used for ordinary households and businesses.

[0002]

2. Description of the Related Art A conventional motor will be described below with reference to the drawings. FIG. 12 is a schematic diagram showing a configuration of a conventional electric motor. In the figure, a first object as a stator includes a first iron core 1 having a slot, a first winding 2u wound around the slot to form a three-phase winding 2, and a second winding 2u.
Of the Hall IC 3u, Hall IC 3v, and Hall IC 3w constituting the position detecting means 3 for detecting the relative position of the second winding 3v, the third winding 2w, and the second object as the rotor. We prepare for every degree.

On the other hand, the second object here has a four-pole ring-shaped permanent magnet 4 arranged around a second iron core 5.

The operation of the above configuration will be described.
When three-phase power is input to the three-phase winding 2, a current flows through the three-phase winding 2, and the field between the permanent magnet 4 causes the permanent magnet 4 to move between the permanent magnet 4 and the three-phase winding 2 according to Fleming's left-hand rule. When the second object is rotatably arranged with respect to the first object in a state where the first object is fixed, an electromagnetic force is generated in the second object. It starts operation by force and rotates.

The current flowing through one conductor of the three-phase winding 2 is i, the magnetic flux density generated by the permanent magnet 4 is b,
If the length of the conductor passing through the iron core 1 is 1 and the generated electromagnetic force is f, f = b · i · l, and the generated torque is a value obtained by multiplying f by the number of conductors and the radius. Becomes

As described above, the second object generates power by receiving the torque and rotating.

[0007]

In such a conventional motor, for example, when the load is large, a large current for driving the motor may flow through the three-phase winding 2, and the electric power may be supplied. If the DC power supply voltage rises abnormally, or if the control of each phase malfunctions due to noise and the current flowing through the three-phase winding 2 becomes extremely unbalanced, the three-phase winding 2 will overheat. In order to prevent such a situation, the components of the electric motor need to have a high heat-resistant temperature.

The present invention solves the above-mentioned problems, and does not require components having a high heat-resistant temperature, is safe and has a low cost, and provides a low-cost electric motor and a power generator, and an electric washing machine using the power generator. Machine and to provide.

[0009]

According to the present invention, there is provided a first object having a three-phase winding composed of a first winding, a second winding, and a third winding. A second object that generates electromagnetic force between the first object and the first object by a current flowing through the three-phase winding; and one of the first to third windings A first fusing unit connected in series to one of the two, and a second fusing unit connected in series to any one of the remaining two, wherein the first fusing unit and the second fusing unit are Both are electric motors that melt when the temperature exceeds a predetermined temperature.

According to the present invention, by connecting the first fusing means and the second fusing means in series to any two of the first to third windings, for example, When current flows excessively through the three-phase winding due to overload, the three-phase winding generates heat, and the first fusing means and the second fusing means are sequentially blown when the temperature exceeds a predetermined temperature. Thereby, in any abnormal state, when the electric motor overheats, the current path of the three-phase winding is completely cut off,
By not supplying the three-phase power to the three-phase winding, it is possible to completely prevent the temperature of the electric motor from rising to the predetermined temperature or more, to prevent performance deterioration with a minimum number of parts, and to prevent fire. It is possible to provide a highly stable electric motor that can prevent occurrence of the electric motor.

The present invention according to claim 2 is the electric motor according to claim 1, wherein the first fusing means and the second fusing means are detachable.

According to the present invention, when the first fusing means and the second fusing means are blown, there is no need to replace the electric motor only by replacing them with new ones. Therefore, maintenance is easy, the repair cost is low, and the safety is low. A simple electric motor can be provided.

According to a third aspect of the present invention, there is provided the electric motor according to the first or second aspect, wherein the second object includes a permanent magnet.

According to the present invention, since the second object gives a field by the permanent magnet to generate an electromagnetic force between the second object and the first object, no special electric power for the field is required. For this reason, it is possible to provide a highly stable electric motor which has high efficiency and prevents overheating by the operation of the first fusing means and the second fusing means.

According to a fourth aspect of the present invention, there is provided the electric motor according to any one of the first and second aspects, wherein the second object includes a short-circuited fourth winding.

According to the present invention, there is provided a highly safe electric motor in which the second object can be constructed simply, at low cost and robustly, and in which heating is prevented by the action of the first fusing means and the second fusing means. be able to.

According to a fifth aspect of the present invention, there is provided the electric motor according to the first or second aspect, wherein the second object includes a magnetic material having hysteresis characteristics.

According to the present invention, the rotation synchronized with the power supply frequency can be obtained with a relatively simple configuration, the rotation can be easily started, and the safety by preventing the heating by the action of the first fusing means and the second fusing means. Motor with high performance can be provided.

According to a sixth aspect of the present invention, in the first aspect, the second object includes a magnetic body having magnetic irregularities.
An electric motor according to claim 2.

According to the present invention, a high-safety electric motor which can be rotated with a robust and relatively simple configuration and is synchronized with the power supply frequency and which is prevented from heating by the action of the first fusing means and the second fusing means. Can be provided.

According to a seventh aspect of the present invention, there is provided the electric motor according to any one of the first to sixth aspects, wherein the periphery of the first object is filled with a resin.

According to the present invention, the first fusing means and the second fusing means are provided.
By setting the fusing temperature of the fusing means to be equal to or lower than the heat-resistant temperature of the resin to be filled, overheating of the resin can be prevented, so that performance degradation of the electric motor can be prevented and noise can be reduced.

According to an eighth aspect of the present invention, there is provided the electric motor according to any one of the first to seventh aspects, an inverter, and control means for controlling the inverter, wherein the control means is connected via the inverter. A power generating device for controlling the motor to supply a three-phase current to the motor.

According to the present invention, not only when an overload is applied but also when an inverter fails, the current path of the three-phase winding is finally completely cut off, so that it is simple, low-cost, and safe. It is possible to provide a power generation device having high reliability.

According to a ninth aspect of the present invention, the control means includes:
A disconnection detecting means for detecting that at least one of the first fusing means and the second fusing means is in a fusing state; and a notifying means for notifying a user, wherein the disconnection detecting means comprises the first fusing means. 9. A power generating apparatus according to claim 8, wherein when it is detected that at least one of said second fusing means is in a fusing state, said motor is informed of a breaking state.

According to the present invention, when at least one of the first fusing means and the second fusing means is in a fusing state, the disconnection detecting means detects the state, and the informing means is that the electric motor is in a disconnected state. Since the power generation device does not operate, it is possible to reliably confirm the failure location,
A safe power generator that can be easily repaired can be provided.

According to a tenth aspect of the present invention, there is provided an electric washing machine provided with the power generating device according to the eighth or ninth aspect.

According to the present invention, for example, when the laundry is overloaded, when the laundry is entangled with the movable portion, an overload state occurs, or when the inverter constituting the power generating device is in a failure state, the first state can be obtained. To provide an electric washing machine with high safety, since the fusing means and the second fusing means completely shut off the current path of the three-phase winding to stop the electric motor and prevent overheating. Can be.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention according to claim 1, the first fusing means and the second fusing means are any two of a first winding to a third winding in a three-phase winding. Are connected in series with each other, and are blown at a predetermined temperature in response to a rise in the temperature of the motor. The motor is always stopped, including the single-phase driving state, by being inserted into any two of the windings. In the embodiment, a temperature fuse that blows at a predetermined temperature is used as the first fusing means and the second fusing means, but a current fuse that blows at a predetermined overcurrent may be used. In this case, the ratings for the predetermined temperature or the predetermined overcurrent of the first fusing means and the second fusing means are the same. The second object has a configuration in which a fourth coil is wound around a second iron core and an exciting current is supplied from a DC power supply, but the present invention is not limited to this.

In the present invention according to claim 2, the configuration in which the first fusing means and the second fusing means are detachably provided means means that can be easily replaced by the user when they are blown. In the example, the first fusing means and the second
The fusing means are housed in a detachable case to form an integral part, and both ends of the first fusing means and both ends of the second fusing means are connected to four exposed terminals of the detachable case.
On the motor side, the outer case is provided with an arrangement portion for accommodating the detachable case, and receiving terminals for the four terminals are provided. However, it is not limited to this.

According to the third aspect of the present invention, the configuration of the second object having the permanent magnet is the same as that of the conventional example, and in the embodiment, the permanent magnet is bonded to the iron core.
In this case, since the operation is stopped at a predetermined temperature by the action of the first fusing means and the second fusing means, deterioration of the adhesive due to high temperature can be prevented.

In the present invention according to claim 4, the structure of the second object having the fourth winding is equivalent to a rotor of a motor generally known as an induction motor. A cage-type rotor in which a large number of aluminum die-casting conductor rods are embedded in grooves of the second core between short-circuit rings made of aluminum die-casting is not limited to this.
For example, a configuration in which a copper wire is wound around the second iron core and both ends are short-circuited may be used. The second object is rotated by the induced current of the fourth winding in a short-circuit state and the rotating magnetic field by the three-phase winding. A solid second object can be realized with a relatively simple configuration.

In the present invention according to claim 5, the structure of the second object provided with the magnetic material having hysteresis characteristics is equivalent to a rotor of an electric motor generally known as a hysteresis motor. Can be used. In the embodiment, the ferrite is formed in a ring shape and provided by being adhered and fixed to the surface of the second iron core. However, the present invention is not limited to this. The second object generates a field whose phase is delayed with respect to the rotating magnetic field of the three-phase winding, and rotates following the rotating magnetic field.
A second object having a feature of easily starting and having a simple configuration can be realized.

In the present invention according to claim 6, the structure of the second object having the magnetic material having mechanical irregularities is equivalent to a rotor of an electric motor generally known as a reluctance motor, Although the magnetic body has a configuration in which projections of an arbitrary shape are provided, the embodiment has a configuration in which four projections are provided. However, it is not limited to this,
For example, a configuration having magnetic irregularities by changing the distribution of magnetic characteristics may be used. The second object rotates with the protrusion attracted to the rotating magnetic field. A solid and very simple second object can be realized.

In the present invention according to claim 8, the inverter includes a first winding, a second winding, and a third winding which form a three-phase winding by connecting a series circuit in which two switching elements are connected in series. The two ends of each series circuit are respectively connected to a DC power supply, and one of the three series circuits
The common connection point of the two switching elements
And the common connection point of the two switching elements in another series circuit is connected to the second winding via the second fusing means, but remains. The common connection point of the two switching elements in one series circuit is directly connected to the third winding. The fusing means does not need to be inserted into all windings, and the first fusing means and the second
If both of the fusing means are blown, the current of the three-phase winding is cut off in all of the first to third windings, and the electric motor always stops. Even if one of the first fusing means and the second fusing means is blown, the other fusing in the process of single-phase driving is also blown. The control means controls the opening and closing of each switching element in each of the series circuits so that the driving direction and the driving speed input by the user via the operation unit are achieved. I do. However, it is not limited to this.

In the ninth aspect of the present invention, the disconnection detecting means is means for detecting a state in which at least one of the first fusing means and the second fusing means is fusing.
In the embodiment, a current detecting means for detecting an input current of the inverter is provided, and a disconnection state is detected based on a relationship between an operation command and a current. In this case, if either one is blown, the current of the inverter will cause an abnormality in the conduction pattern due to single-phase drive, and if both are blown, the operation command will be output. Regardless, it can be detected by no current flowing. Note that the disconnection detecting means can be realized by microcomputer processing. Further, the current detecting means inserts a low resistance into a current path from the DC power supply to the inverter, and detects a current based on a voltage between both ends. The notifying unit is a unit for notifying the user of the fusing result, and includes a display unit using a light emitting element or the like, a unit using sound or voice, and is not limited to any one. This notification means is particularly effective when the operation of the electric motor cannot be visually confirmed.

According to a tenth aspect, an electric washing machine includes the power generating device according to the eighth or ninth aspect.

Hereinafter, embodiments of the present invention will be described.

[0039]

(Embodiment 1) Hereinafter, Embodiment 1 of an electric motor according to the present invention will be described with reference to the drawings. This embodiment relates to claim 1.

FIG. 1 is a schematic diagram showing the configuration of this embodiment. The same components as those in the conventional example are given the same numbers. The main difference between the present embodiment and the conventional example is that the present embodiment is provided with a detachable first fusing unit 6 and a second fusing unit 7, and the fusing is performed when the current flowing through the three-phase winding 2 becomes excessive. That's what I did.

In FIG. 1, a first object is a three-phase winding 2
, The first winding 2u, the second winding 2v, and the third winding 2w, the first fusing means 6, the second fusing means 7, and the first iron core 1. You. The first winding 2u and the first fusing means 6 are connected in series.
Winding 2v and the second fusing means 7 are connected in series,
One terminal of the winding 2u, the second winding 2v, and the third winding 2w are commonly connected, and a three-phase current is supplied from the other terminal. The first iron core 1 is configured by stacking, for example, silicon steel sheets in multiple layers, and has a slot. First winding 2u, second winding 2v, and third winding 2w
Means that, as shown in FIG. 1, each is equally divided into two and wound around the slot, and the two divided windings are connected in series.

Here, the first fusing means 6 and the second fusing means 7 use temperature fuses that blow when the temperature exceeds a predetermined temperature. The thermal fuse is connected to the first blowing means 6.
And the second fusing means 7 have the same rating.
However, this configuration is merely an example, and the present invention is not limited to this. For example, a current fuse that breaks when the current flowing through the three-phase winding 2 exceeds a predetermined value instead of the temperature may be used.

In the present embodiment, the second object comprises a field coil 8, a DC power supply 9 and a second iron core 5. As shown in FIG. Wound around the iron core 5, a DC power supply 9 supplies electric power to the field coil 8 to generate a field. Further, the second iron core 5 is formed by laminating silicon steel sheets similarly to the first iron core 1.

At this time, the first object is a stator fixed with screws or the like, and the second object is a rotor rotatably held by bearings. In addition,
The above configuration is an example, and any configuration may be used as long as an electromagnetic force is generated between the first object and the second object by the current flowing through the three-phase winding 2 of the first object. It is not limited.

The operation of the above configuration will be described.
When power is supplied to the three-phase winding 2, a current flows through the three-phase winding 2, and the second object is driven by the field coil 8 and the DC power supply 9 to control the current between the field and the three-phase winding 2. As a result, an electromagnetic force is generated between the first object and the first object according to Fleming's left-hand rule, and rotation starts in a direction based on Fleming's left-hand rule. At this time, if it is assumed that the locked state occurs due to an obstacle being mixed between the first object and the second object, the current flowing through the three-phase winding 2 increases, and the current value and the three-phase winding The loss increases due to the resistance value of the winding 2 and the three-phase winding 2
The heat generation of this increases.

In this embodiment, when the temperature exceeds a predetermined temperature, the first fusing means 6 and the second fusing means 7 are sequentially turned on by the temperature fuses constituting the first fusing means 6 and the second fusing means 7. The current path of the three-phase winding 2 is cut off by fusing. Therefore, no current flows through the three-phase winding 2 and the motor does not generate heat.

Here, the first fusing means 6 and the second fusing means 7 use the same rated temperature fuses.
Due to the variation of the thermal fuse or the variation of the first to third windings 2u to 2w, one of them may be blown first. However, through the other fusing means,
If a single-phase current is still supplied and the temperature continues to rise, the other fusing means is also blown when the temperature exceeds a predetermined temperature, and the power supply from the three-phase power supply is completely stopped. Therefore, even if any abnormality occurs, the power supply from the three-phase power supply can be completely stopped before the temperature of the electric motor rises to a predetermined temperature or more.

When the temperature at which the motor is stopped is set, the motor can be stopped at any predetermined temperature only by selecting the rating of the thermal fuse.
For example, a three-phase winding 2 or the like having a low heat-resistant temperature can be used, and a highly safe electric motor can be realized.

As described above, according to the present embodiment, the first fusing means 6 and the second fusing means 7 are inserted in series in the three-phase winding 2 and provided, so that the It is possible to prevent a temperature rise above a predetermined temperature and realize a highly safe electric motor with a simple configuration.

(Embodiment 2) Hereinafter, Embodiment 2 of the electric motor of the present invention will be described with reference to the drawings. This embodiment relates to claim 2.

FIG. 2 is a sectional view showing the structure of this embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. In FIG. 2, the second iron core 5 is rotatably held with respect to the first iron core 1 by an outer case 10, a bearing 11, and a shaft 12. Here, the three-phase winding 2 is wound around a slot provided in the first iron core 1. The first fusing means 6 and the second fusing means 7 are composed of, for example, two thermal fuses having the same rating, and are housed inside the detachable case 13. On the outer shell of the detachable case 13, two terminals are exposed for one fusing means, and a total of four terminals are provided.
At this time, the inside of the detachable case 13 is filled with a filler having a high thermal conductivity such as silicon, and the first fusing means 6 and the second fusing means 7 are connected to the surrounding temperature through the filling. Responsiveness is ensured. Further, by disposing two fusing means in one attachment / detachment case 13, consideration is given so that there is no variation in temperature due to a difference in arrangement position.

The first iron core 1 is provided with an arrangement portion 14 on which a detachable case 13 can be disposed, and the disposition portion 14 is provided with four terminals for inserting the four terminals of the detachable case 13. . By inserting the detachable case 13 into the arrangement portion 14, the four terminals are connected to each other, and the first fusing means 6 and the second fusing means 7 and the three-phase winding 2 are connected in series. Note that this configuration is an example, and the means for detaching the first fusing means 6 and the second fusing means 7 is not limited to this.

A field coil 8 is wound around a slot provided in advance in the second iron core 5. Further, the shaft 12 is provided at the center of the second iron core 5, and as shown in the figure, by inserting the shaft 12 into the bearing 11, the second iron core 5 is rotatable about the shaft 12 as a central axis. Will be arranged.

As described above, according to the present embodiment, the first fusing means 6 and the second fusing means 7 are housed in the detachable case 13 so as to be detachably provided. Even if the fusing means 6 and the second fusing means 7 are blown, it is possible to operate again simply by replacing them with new ones. In addition, since there is no need to replace the motor itself, the cost for repair is not so large, and an inexpensive and highly safe motor can be realized.

(Embodiment 3) Hereinafter, Embodiment 3 of the motor of the present invention will be described with reference to the drawings. This embodiment relates to claim 3.

FIG. 3 is a schematic diagram showing the configuration of the present embodiment. The same components as those in the first and second embodiments are denoted by the same reference numerals, and the detailed description is omitted. This embodiment is different from the first and second embodiments in the configuration of the second object.

In FIG. 3, the second object is, for example,
It comprises a second iron core 5 and a ring-shaped four-pole permanent magnet 4. The permanent magnet 4 forms a ring covering the second iron core 5 and is fixed to the second iron core 5 with an adhesive. At this time, the second iron core 5 is disposed rotatably with respect to the first object by the shaft 12, the bearing 11, and the like.

The first object is composed of first iron cores 1 and 3
A first winding 2u, a second winding 2v,
And the third winding 2 w, the first fusing means 6, and the second fusing means 7. These arrangements and connections are the same as in the first and second embodiments. However, this is an example, and the present invention is not limited to this. Further, the Hall ICs 3u to 3w are arranged for every 120 electrical degrees, and the position of the permanent magnet 4 with respect to the first object is detected by a combination of the output signals of the Hall ICs 3u to 3w. However, this is only an example, and the permanent magnet 4 may have two poles or may be embedded in the second iron core 5.
The means provided with the permanent magnet 4 is not limited to this, and the permanent magnet 4 is not limited to two poles.

The operation in the above configuration will be described.
When three-phase power is input to the three-phase winding 2 in response to the output signals of the Hall ICs 3u to 3w, a current flows through the three-phase winding 2 and the permanent magnet 4 of the second object generates a field. Therefore, based on Fleming's left-hand rule, the direction between the first object and the second object depends on the direction of the current flowing through the three-phase winding 2 and the direction of the field of the permanent magnet 4. An electromagnetic force is generated, and the second object rotates in the direction of the electromagnetic force.

As described above, according to the present embodiment, the permanent magnet 4 is provided for the second object to provide a field, so that a field winding and a power supply for the field are not required, and It is possible to realize an electric motor with high efficiency with reduced loss and high safety against abnormal conditions.

(Embodiment 4) Hereinafter, Embodiment 4 of the motor of the present invention will be described with reference to the drawings. This embodiment relates to claim 4.

FIG. 4 is a schematic diagram showing the structure of this embodiment, and FIG.
FIG. 3 is a perspective view illustrating a configuration of a second object in the present embodiment. The same components as those in the first to third embodiments are denoted by the same reference numerals, and the detailed description will be omitted. This embodiment is different from the first to third embodiments in the configuration of the second object.

In FIG. 5, the second object has a large number of aluminum die-casting conductor rods 16 arranged between two aluminum die-casting short-circuit rings 15 and embedded in a groove provided in the second iron core 5. Shall be. However, the short-circuit ring 15 and the conductor rod 1
6 is not limited to this, for example, the second iron core 5 provided with a slot
The copper wire may be wound in a coil shape and both ends of the copper wire may be connected.

In FIG. 4, the first object is composed of a first iron core 1 provided with a slot, a first winding 2u, a second winding 2v, and a 3 winding 2w
And a first fusing unit 6 and a second fusing unit 7. These connections and arrangements are the same as in the second embodiment. However, this is an example, and the connection method and the arrangement method are not limited to this.

The operation in the above configuration will be described.
When three-phase power is input to the three-phase winding 2, a current flows through the three-phase winding 2 to generate a rotating magnetic field. In other words, the state is the same as the state where the two-pole permanent magnet is rotating. Based on Fleming's left-hand rule, the conductor rod 16 made of aluminum die-casting is used.
, An induced electromotive force is induced by the rotating magnetic field, and an induced current flows through the conductor bar 16 made of aluminum die casting. At this time, an electromagnetic force is generated between the induced current and the rotating magnetic field according to Fleming's left-hand rule, and the second object rotates in the same direction as the rotating direction of the rotating magnetic field.

As described above, according to the present embodiment, the second
By providing the conductor rod 16 made of aluminum die-casting, the structure of the object can be made rigid, sufficiently endure high-speed rotation, and realize a motor with high safety against abnormal conditions.

(Embodiment 5) Hereinafter, Embodiment 5 of the motor of the present invention will be described with reference to the drawings. This embodiment relates to claim 5.

FIG. 6 is a schematic diagram showing the configuration of this embodiment. The same components as those in the first to fourth embodiments are denoted by the same reference numerals, and description thereof will be omitted. This embodiment is different from the first to fourth embodiments in the configuration of the second object.

In FIG. 6, the second object is composed of the second iron core 5 and a ring-shaped ferrite 17, and the ferrite 17 is formed in a ring shape so as to cover the second iron core 5. The joint between the iron core 5 and the ferrite 17 is fixed with an adhesive. However, this is only an example, and the magnetic material having hysteresis characteristics is not limited to ferrite, and the configuration in which the second object includes the magnetic material having hysteresis characteristics is not limited to the above.

The first object is composed of a first winding 2u, a second winding 2v, and a third winding 2w constituting the three-phase winding 2, and the first fusing means 6 and the third winding 2w. 2 fusing means 7;
And a first iron core 1 provided with slots. These connections and arrangements are the same as in the first and second embodiments. However, this is an example, and the connection method and the arrangement method are not limited to this.

The operation in the above configuration will be described.
When three-phase power is input to the three-phase winding 2, a current flows through the three-phase winding 2 to generate a two-pole rotating magnetic field. Here, since the ferrite 17 has a hysteresis characteristic, magnetic induction is generated in response to the rotating magnetic field, and a magnetic pole of the opposite polarity is generated in the ferrite 17 just. At this time, if there is a difference between the rotation speed of the rotating magnetic field and the rotation speed of the second object, a change in the magnetic field occurs at the frequency of the difference, so that the ferrite 17 is located on the BH plane. It draws a hysteresis loop and generates torque so as to be attracted to the rotating magnetic field.

When the torque of the load is smaller than a predetermined value, the speed of the second object becomes the synchronous speed, the magnetic field of the ferrite 17 does not change, and the hysteresis loss generated in the second object becomes almost zero. Thus, relatively efficient operation becomes possible.

As described above, according to the present embodiment, the second object is provided with the ferrite 17 so that the rotation synchronized with the power supply frequency can be obtained with a simple structure, With respect to the abnormal state of the phase power supply, a motor with high safety can be realized as in the first to fourth embodiments.

(Embodiment 6) Embodiment 6 of the motor of the present invention will be described below with reference to the drawings. This embodiment relates to claim 6.

FIG. 7 is a schematic diagram showing the configuration of this embodiment. The same components as those in the first to fifth embodiments are denoted by the same reference numerals, and description thereof will be omitted. This embodiment is different from the first to fifth embodiments in the configuration of the second object.

In FIG. 7, the second object is provided with mechanical irregularities on the surface of the second iron core 5 so as to have magnetic irregularities. However, this is an example, and as a means for providing magnetic irregularities, mechanical irregularities are not necessarily required.For example, by changing the material or using an iron plate having a laminated structure, depending on the angle, A configuration in which the ease of magnetism changes may be adopted, and the present invention is not limited to the above method.

The first object is composed of a first winding 2u, a second winding 2v, and a third winding 2w constituting the three-phase winding 2, and the first fusing means 6 and the third winding 2w. 2 fusing means 7;
And a first iron core 1 provided with a slot. These connections and arrangements are the same as in the first and second embodiments. However, this is an example, and the present invention is not limited to this.

The operation in the above configuration will be described.
When three-phase power is input to the three-phase winding 2, a current flows through the three-phase winding 2 to generate a two-pole rotating magnetic field. Here, since the second iron core 5 is provided with magnetic irregularities by providing mechanical irregularities on the surface, reluctance torque is generated corresponding to the rotating magnetic field. In other words, the portion where the absolute value of the magnetic flux of the rotating magnetic field is the maximum and the portion where the magnetic resistance of the second iron core 5 is the smallest attract the second iron core 5 to the rotation speed of the rotating magnetic field. It rotates at speed and generates torque. Therefore, when the torque of the load is smaller than the predetermined value, the second object can rotate at the synchronous speed.

As described above, according to the present embodiment, since the second object is provided with the second iron core 5 having mechanical irregularities, rotation in synchronization with the power supply frequency can be performed with a relatively simple configuration. As with the first to fifth embodiments, it is possible to realize a motor with high safety against overload and abnormal state of the three-phase power supply.

(Embodiment 7) Hereinafter, an electric motor according to a seventh embodiment of the present invention will be described with reference to the drawings. This embodiment relates to claim 6.

FIG. 8 is a sectional view showing the structure of this embodiment. The same components as those in the first to sixth embodiments are denoted by the same reference numerals, and description thereof is omitted. This embodiment is different from the first to sixth embodiments in the configuration of the first object.

In FIG. 8, a first object is composed of a first winding 2u, a second winding 2v, and a third winding constituting a three-phase winding 2.
Winding 2w, a first fusing means 6 and a second fusing means 7 (not shown), and a first
And an iron core 1. These connections and arrangements are the same as in the first and second embodiments. In the present embodiment, the periphery of the first iron core 1 and the three-phase winding 2 is molded with a resin 18, and the thermal fuses constituting the first fusing means 6 and the second fusing means 7 are in a blown state. The rating of the predetermined temperature is selected so as to be lower than the heat resistant temperature of the resin 18.

The second object is composed of a second iron core 5 and a four-pole permanent magnet 4, and the constituent means is the same as that of the third embodiment. However, this is an example, and the present invention is not limited to this. Absent.

The operation in the above configuration will be described.
The motor shown in FIG. 8 operates in the same manner as in the second embodiment. For example, a large current flows through the three-phase winding 2 so that the three-phase winding 2 is overheated. If the temperature of the resin 18 is to exceed the heat resistant temperature due to the rise in temperature, the thermal fuses constituting the first fusing means 6 and the second fusing means 7 are blown. The motor is stopped by being shut off, and the resin 18 does not deteriorate or be damaged at a temperature exceeding the heat-resistant temperature.

As described above, according to the present embodiment, the electric motor is molded with the resin 18 and the fusing temperature of the first fusing means 6 and the second fusing means 7 is set lower than the heat resistant temperature of the resin 18. Therefore, even if the electric motor generates heat, the temperature does not exceed the heat resistant temperature of the resin 18, and the resin 18 can be prevented from expanding due to overheating, cracking, smoking or ignition, and high safety is provided. Motor can be realized. Furthermore, by molding the motor with resin, electromagnetic noise can be reduced and the motor can be made quieter.

(Embodiment 8) Hereinafter, a first embodiment of a power generating apparatus according to the present invention will be described with reference to the drawings. This embodiment relates to claim 7.

FIG. 9 is a circuit diagram showing the configuration of this embodiment. The same components as those in the first to seventh embodiments are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 9, reference numeral 19 denotes a motor, which is the same as the motor shown in the third embodiment, but is not limited to this. The inverter 20 includes a series circuit of a switching element 21u and a switching element 22u,
The switching device includes a series circuit of a switching element 21v and a switching element 22v and a series circuit of a switching element 21w and a switching element 22w. The switching elements 21u to 22w are all IGBTs (Insulated Gate B).
ipolar Transistor) and a reverse conducting diode are connected in parallel. The U terminal of the first winding 2u via the first fusing means 6, the V terminal of the second winding 2v via the second fusing means 7, and the W terminal of the third winding 2w are: Each is connected to a common connection point of two switching elements in the corresponding series circuit, and by a combination of ON and OFF of the switching elements 21u to 22w,
It is controlled to switch between three states: positive voltage, zero voltage, and open.

The switching elements 21u to 22w are turned on / off by a position detecting means 3 having a Hall IC 3u, a Hall IC 3v, and a Hall IC 3w arranged at an electrical angle of 120 degrees, a microcomputer, and the like. The control unit 23 is controlled by a control unit 23. The control unit 23 inputs a setting command from an operation unit 24 including several switches, and controls the electric motor 19 to be in the driving direction and speed of the setting command. Drive control. Here, the control means 23 includes the operation mode command unit 2
5, a three-phase distribution circuit 26, a driving circuit 27, a triangular wave generating means 28, a conduction ratio setting means 29, a comparing circuit 30, and a speed detecting means 31. However, this is an example, and the configurations of the inverter 20, the control unit 23, and the position detection unit 3 are not limited to this. Also, 3
Reference numeral 2 denotes a commercial power supply, 33 denotes a diode bridge, 34 denotes a choke coil, and 35 denotes a smoothing capacitor. The diode bridge 33, the choke coil 34, and the smoothing capacitor 35 constitute a DC power conversion device.
2 is converted to a DC power supply.

The operation in the above configuration will be described.
When the user sets the operation direction and speed of the electric motor 19 via the operation unit 24, the operation mode command unit 25 sets the operation direction and speed of the electric motor 19, and sends the operation direction command to the three-phase distribution circuit 26. At the same time, the speed setting value is input to the conduction ratio setting means 29. Three-phase distribution circuit 26
Stores in advance a data table for each ON / OFF setting of the switching elements 21u to 22w corresponding to the output signals of the Hall ICs 3u to 3w of the position detecting means 3 for each driving direction. An on / off signal for each switching element is output to the drive circuit 27 based on the output signals of ~ 3w.
When the speed set value is input, the conduction ratio setting means 29 receives the speed set value and the switching elements 21u to 21u.
A voltage value based on a predetermined relationship between w and the conduction ratio is input to the comparison circuit 30 as a conduction ratio set value. The control based on the conduction ratio is performed for the switching elements 21u to 21w, and the switching elements 22u to 22w are controlled.
It is assumed that w is turned on and off during the conduction period corresponding to the output signal of the position detection means 3.

The comparison circuit 30 compares the voltage of the conduction ratio set value with the output signal of the triangular wave generating means 28,
An on / off signal for switching W is input to the drive circuit 27 at the same frequency as the output signal of the triangular wave generator 28. The drive circuit 27 outputs the output signal of the three-phase distribution circuit 26 and the comparison circuit 30
And the output signals of the switching elements 21u-21
w, the switching elements 21u to 22w are turned on at a desired conduction ratio. Thereby, a voltage is applied to two terminals of the U terminal, the V terminal, and the W terminal of the three-phase winding 2, and a current flows through the three-phase winding 2, and the second object constituting the electric motor 19 is: As described in the third embodiment, since the magnetic field is generated by the permanent magnet 4, a torque based on Fleming's left-hand rule is generated between the three-phase winding 2 and the permanent magnet 4, and the second object Starts rotation in the direction of the operation command. Thereafter, each time any one of the signals of the Hall ICs 3u, 3v, and 3w changes, the three-phase distribution circuit 26 sets the Hall IC 3u,
An on / off signal for each switching element corresponding to the 3v, 3w signals is input to the drive circuit 27, and the drive circuit 27 uses the on / off signals to switch the switching elements 21u to 22u.
By turning on and off w, a current corresponding to the field direction of the permanent magnet flows through the three-phase winding 2 and the second object continues to rotate.

At this time, the speed detecting means 31 has detected the number of pulses of the Hall IC 3u generated within a predetermined time.
The result is input to the conduction ratio setting means 29. The duty ratio setting means 29 compares the output signal of the speed detection means 31 with the speed setting value, and always sets an optimum duty ratio to input to the comparison circuit 30. As a result, the electric motor 19 continues to rotate at the speed set value set by the user via the operation unit 24.

Now, for example, when the second object is shaken and comes into contact with the first object and decelerates due to the friction, the conduction ratio setting means 29 causes the second object to rotate at a desired speed. It is determined that there is no switching element 21u ~
21 w is increased. As a result, the current flowing through the three-phase winding 2 increases, and the temperature of the three-phase winding 2 increases,
When the temperature exceeds a predetermined temperature, the first fusing means 6 and the second fusing means 7 are sequentially blown, the current path of the three-phase winding 2 is cut off, and the motor 19 stops.

Also, when the switching elements 21u to 22w are broken by an overcurrent or external noise and short-circuited, the three-phase winding 2 has the switching elements 21u to 21w.
Excessive current flows irrespective of the conduction ratio of the three-phase winding 2, even in this case, if the first fusing means 6 and the second fusing means 7 exceed a predetermined temperature, they are sequentially blown. Is shut off, and the motor 19 stops. Since the first fusing means 6 and the second fusing means 7 do not return once the fusing is performed, it is safe even if the control means 23 is out of order.

As described above, according to the present embodiment, the first fusing means 6 and the second fusing means 7 are inserted and provided in the three-phase winding 2 of the electric motor 19 of the power generating apparatus.
Even if the temperature of the electric motor 19 rises due to an increase in load or a failure of the inverter 20 and the control means 23, the current of the three-phase winding 2 is cut off at a predetermined temperature, so that a very safe power generation device can be realized. .

Embodiment 9 Hereinafter, a power generator according to Embodiment 2 of the present invention will be described with reference to the drawings. This embodiment relates to claim 9.

FIG. 10 is a circuit diagram showing the configuration of this embodiment. The same components as those in the eighth embodiment are denoted by the same reference numerals, and the detailed description is omitted. This embodiment is different from the eighth embodiment in that the control means 23 includes a current detection means 36, a disconnection detection means 37, and a display means 38, and at least one of the first fusing means 6 and the second fusing means 7. If one of them is blown, the user is notified.

In FIG. 10, the power generating device includes a motor 19, an inverter 20, a control means 23, and a Hall IC 3u.
3w and the operation unit 24. The control unit 23 includes an operation mode command unit 25, a three-phase distribution circuit 26, a drive circuit 27, a triangular wave generation unit 28, a conduction ratio setting unit 29, a comparison circuit 30, a speed detection unit 31, a current detection unit 36, and a disconnection. Detection means 37
It consists of. The operation unit 24 includes an operation unit 39 and a display unit 38.

The operation of the above configuration will be described.
When the user sets the operation direction and speed of the electric motor 19 via operation means 39 such as a switch of the operation unit 24, the operation means 39 inputs information set in the operation mode command unit 25. The operation mode command unit 25 inputs the ON command and the driving direction command of the electric motor 19 to the three-phase distribution circuit 26 based on this signal,
9 Enter the speed setting value. Thus, the three-phase distribution circuit 26 and the conduction ratio setting means 29 perform the same operations as in the eighth embodiment, and the electric motor 19 rotates.

Here, as in the eighth embodiment, when the electric motor 19 generates heat due to an overload condition or the like and the first fusing means 6 and the second fusing means 7 are sequentially blown, the operation mode command unit 25 Output the ON command of the electric motor 19 to the three-phase distribution circuit 26, no current flows through the three-phase winding 2.

The current detecting means 36 is composed of, for example, a ceramic resistor for high power, and detects the input current value of the inverter 20 by measuring the voltage between both ends.
Further, the disconnection detecting means 37 can be configured by using, for example, a part of a microcomputer, and detects an ON command of the electric motor 19 output by the operation mode command unit 25 and an output signal of the current detecting means 36. If the input current value of the inverter 20 detected by the current detecting means 36 is zero despite the ON command of the motor 19 being output, the first fusing means 6 and the second fusing means 7 are blown. Then, a disconnection state signal is output to the display means 38. Also,
Even when one of the first fusing unit 6 and the second fusing unit 7 is blown, the fusing can be detected based on the voltage waveform pattern output by the current detecting unit 36.

The display means 38 comprises, for example, a light emitting diode or the like, and is configured to receive the disconnection state signal and emit light. Therefore, when the electric motor 19 generates heat to a predetermined temperature and the first fusing means 6 and the second fusing means 7 are blown, the light emitting diode, which is the display means 38, is turned on, so that the user can surely recognize the failed part. be able to. Further, if the display means 38 is a sound means such as a buzzer, the user can immediately recognize that the electric motor 19 is in a disconnected state, so that repair can be performed immediately.

As described above, according to the present embodiment, the disconnection detecting means 37 is provided so that the first fusing means 6 and the second fusing means 7 are provided.
Is detected by the display means 38 to notify the user that at least one of the two has blown, thereby preventing overheating of the electric motor 19 and preventing the electric motor 19 from being overheated.
A power generation device that can be repaired immediately in response to the disconnection state of the power supply can be realized.

(Embodiment 10) Hereinafter, an embodiment of the electric washing machine of the present invention will be described with reference to the drawings. This embodiment relates to claim 11.

FIG. 11 is a sectional view showing the structure of this embodiment. In FIG. 11, the washing machine outer frame 40 has four hanging rods 4.
The washing / dewatering tub 43 is rotatably disposed in the water receiving tub 43, and the stirring blade 44 is rotatably disposed at the bottom of the washing / dewatering tub 43. I have.
The electric motor 19 drives the stirring blade 44 and the washing and dewatering tub 43 via the V-belt 45 and the speed reduction mechanism 46. In addition, 4
7 is a drain valve and 48 is a water supply valve. The operation unit 24 is, for example, a device that allows a user to set a washing method and the like, and also a device that notifies an abnormal state of a component or the like. The control unit 49 controls each step of washing, rinsing, and dewatering based on the information set by the operation unit 24, and controls the electric motor 19. Therefore, the control unit 49 is a means for controlling the water supply valve 48, the drain valve 47, and the like, and the inverter 2 for driving the electric motor 19.
0 and the control means 23. However,
This is an example, and the electric washing machine provided with the power generation device of the present invention is not limited to this. For example, a configuration in which the stirring blade 44 or the washing and dewatering tub 43 is directly driven by the electric motor 19 without providing the V-belt 45 and the speed reduction mechanism 46 may be employed.

The operation in the above configuration will be described.
When the electric motor 19 is driven in a state where the laundry is excessively put in the washing and dewatering tub 43, the motor 19 is driven in an overloaded state,
In order to obtain a high output, a large current flows through the three-phase winding 2 constituting the electric motor 19. As a result, the three-phase winding 2 generates heat,
When the first fusing means 6 and the second fusing means 7 exceed a predetermined temperature, they are sequentially blown and cut off, so that the current path of the three-phase winding 2 is cut off and the motor 19 stops. Therefore, overheating of the electric motor 19 is prevented, and deterioration of the characteristics of the electric motor 19 and its surrounding components, smoke and ignition can be prevented.

If the predetermined temperature at which the first fusing means 6 and the second fusing means 7 are disconnected is set lower than the heat-resistant temperature of the V-belt 45, the V-belt 45 is prevented from being deteriorated by heat. Is also possible.

As described above, according to the present embodiment, too much laundry to be loaded or the inverter 20 constituting the power generation device
In the abnormal state such as the failure of the control unit 23 and the like, the overheating of the electric motor 19 is prevented to prevent deterioration of the components constituting the electric washing machine due to heat, and a failure diagnosis function for notifying the disconnection state of the electric motor 19 is also provided. Thus, a highly safe electric washing machine can be realized.

The motors described in the first to seventh embodiments and the power generators described in the eighth to ninth embodiments all supply power to a load by a rotary motion. The structure is not limited, and may be, for example, a structure generally called a linear motor that performs a linear motion.

[0110]

According to the first aspect of the present invention, there is provided a first object having a three-phase winding composed of a first winding, a second winding, and a third winding; A second object that generates an electromagnetic force between the first object and the first object by a current flowing through the phase winding;
A first fusing means connected in series to any one of the first to third windings, and a second fusing means connected in series to any one of the remaining two windings Means, wherein both the first fusing means and the second fusing means are configured to be blown when the temperature exceeds a predetermined temperature. If the current flows excessively, the three-phase winding generates heat,
The fusing means and the second fusing means are sequentially blown at a stage where the temperature exceeds a predetermined temperature, so that the current path of the three-phase winding is finally completely interrupted in any abnormal condition.
No phase power is supplied, and it is possible to completely prevent the temperature of the electric motor from overheating beyond a predetermined temperature. Therefore, it is possible to provide a highly stable electric motor that can prevent performance deterioration and fire with a simple configuration.

The present invention according to claim 2 provides the electric motor according to claim 1 in which the first fusing means and the second fusing means are detachable. Even if the fusing means 2 is blown, the electric motor can be driven again simply by replacing it with a new one. Therefore, it is possible to effectively utilize resources by eliminating wasteful replacement of the electric motor, and to realize an electric motor with high safety and low repair cost.

According to a third aspect of the present invention, in the motor according to the first or second aspect, the second object is provided with a permanent magnet. By giving a field with a permanent magnet,
Since the electromagnetic force is generated between the first fusing means and the first fusing means, the efficiency is high and the first fusing means and the second fusing means are in an abnormal state. Since the current path of the three-phase winding is completely cut off and the motor is stopped, overheating of the motor can be prevented, and a highly efficient and highly stable motor can be provided.

According to a fourth aspect of the present invention, there is provided the electric motor according to any one of the first and second aspects, wherein the second object includes a short-circuited fourth winding.
The said 2nd object can be comprised simply, at low cost, and robustly, Furthermore, as an electric motor concerning Claim 1, in an abnormal condition, the said 1st fusing means and the said 2nd fusing means are the three-phase windings. Since the current path is completely cut off and the motor is stopped, overheating of the motor can be prevented and a highly stable motor can be provided.

According to a fifth aspect of the present invention, the second object is a motor according to any one of the first and second aspects, wherein the second object is provided with a magnetic material having hysteresis characteristics. 2. The motor according to claim 1, wherein the first fusing means and the second fusing means have three phases in an abnormal state. Since the electric motor is stopped with the current path of the winding completely interrupted, overheating of the electric motor can be prevented, and a simple, low-cost, and highly stable electric motor can be provided.

According to a sixth aspect of the present invention, in the first aspect, the second object includes a magnetic body having magnetic irregularities.
Alternatively, by using the electric motor according to any one of claims 2 to 7, a rotation synchronized with the power supply frequency can be obtained with a robust and relatively simple configuration. Further, the electric motor according to claim 1 performs first fusing in an abnormal state. Since the means and the second fusing means completely shut off the current path of the three-phase winding and stop the electric motor, overheating of the electric motor can be prevented, and it is simple, low-cost, and stable. A high motor can be provided.

According to a seventh aspect of the present invention, there is provided the electric motor according to any one of the first to sixth aspects, wherein the periphery of the first object is filled with a resin. By setting the fusing temperature of the fusing means to be equal to or lower than the heat-resistant temperature of the resin, the electric motor is stopped by completely cutting off the current path of the three-phase winding at the heat-resistant temperature of the resin or lower. It is possible to secure stable performance by preventing overheating, to prevent performance deterioration of the electric motor, and to realize noise reduction.

According to an eighth aspect of the present invention, there is provided the electric motor according to any one of the first to seventh aspects, an inverter, and control means for controlling the inverter, wherein the control means operates via the inverter. The power generation device controls the motor so as to supply a three-phase current to the motor, so that the motor can be overloaded, the control means or the inverter can be destroyed, etc. Finally, since the current path of the three-phase winding can be completely cut off, it is simple and low cost,
Further, it is possible to provide a power generation device with high safety.

According to a ninth aspect of the present invention, the control means comprises:
A disconnection detecting means for detecting that at least one of the first fusing means and the second fusing means is in a fusing state; and a notifying means for notifying a user, wherein the disconnection detecting means comprises the first fusing means. 9. The power generating apparatus according to claim 8, wherein when the motor detects that at least one of the second fusing means is in a fusing state, the motor is informed that the electric motor is in a fusing state. Or, when at least one of the second fusing means is in a fusing state, the disconnection detecting means detects the state, and the notifying means informs that the electric motor is in a disconnected state. It is possible to provide a safe power generation device that can surely confirm a failure location and can easily repair the device.

According to a tenth aspect of the present invention, there is provided an electric washing machine having the power generating device according to any one of the eighth to ninth aspects. In an overload state caused by the laundry being entangled with the laundry, or in a failure state of an inverter constituting the power generation device, the first fusing means and the second fusing means establish a current path of the three-phase winding. Since the motor is stopped by completely shutting off to prevent overheating,
An electric washing machine with high safety can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a motor according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a motor according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram showing a configuration of a third embodiment of the electric motor of the present invention.

FIG. 4 is a schematic view showing a configuration of a motor according to a fourth embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration of a second object in the embodiment.

FIG. 6 is a schematic diagram showing a configuration of a motor according to a fifth embodiment of the present invention.

FIG. 7 is a schematic view showing a configuration of a motor according to a sixth embodiment of the present invention.

FIG. 8 is a sectional view showing a configuration of a motor according to a seventh embodiment of the present invention.

FIG. 9 is a circuit diagram showing a configuration of a power generation device according to a first embodiment of the present invention.

FIG. 10 is a circuit diagram showing a configuration of a power generating apparatus according to a second embodiment of the present invention.

FIG. 11 is a sectional view showing the configuration of an embodiment of the electric washing machine of the present invention.

FIG. 12 is a schematic diagram showing a configuration of a conventional electric motor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st iron core 2 3 phase winding 2u 1st winding 2v 2nd winding 2w 3rd winding 3 Position detection means 3u, 3v, 3w Hall IC 4 Permanent magnet 5 2nd iron core 6 1st Fusing means 7 Second fusing means 8 Field coil (fourth winding) 9 DC power supply 10 Outer case 11 Bearing 12 Shaft 13 Detachable case 14 Arrangement part 15 Short-circuit ring 16 Conductor rod 17 Ferrite 18 Resin 19 Motor 20 Inverter 21u, 21v, 21w, 22u, 22v, 22w Switching element 23 Control means 24 Operation part 25 Operation mode command part 26 Three-phase distribution circuit 27 Drive circuit 28 Triangular wave generation means 29 Conduction ratio setting means 30 Comparison circuit 31 Speed detection means 32 Commercial Power supply 33 Diode bridge 34 Choke coil 35 Smoothing capacitor 36 Current detection means 37 Disconnection Line detecting means 38 Display means (notifying means) 39 Operating means 40 Washing machine outer frame 41 Hanging rod 42 Water receiving tub 43 Washing and dewatering tub 44 Stirrer blade 45 V belt 46 Reduction mechanism 47 Drain valve 48 Water supply valve 49 Control unit

Claims (10)

[Claims] A first object having a three-phase winding composed of a first winding, a second winding, and a third winding; and a current flowing through the three-phase winding, the first object having a three-phase winding. A second object for generating an electromagnetic force between the first and third objects, a first fusing means connected in series to any one of the first to third windings, A second fusing unit connected in series to any one of the remaining two, and the first fusing unit and the second fusing unit are configured to be blown when the temperature exceeds a predetermined temperature. Electric motor. 2. The electric motor according to claim 1, wherein the first fusing means and the second fusing means are detachable. 3. The electric motor according to claim 1, wherein the second object includes a permanent magnet. 4. The electric motor according to claim 1, wherein the second object includes a short-circuited fourth winding. 5. The electric motor according to claim 1, wherein the second object includes a magnetic body having a hysteresis characteristic. 6. The electric motor according to claim 1, wherein the second object includes a magnetic body having magnetic irregularities. 7. The electric motor according to claim 1, wherein the periphery of the first object is filled with a resin. 8. An electric motor according to claim 1, further comprising: an inverter; and control means for controlling the inverter, wherein the control means controls the electric motor through the inverter through a three-phase motor. A power generation device that controls so as to supply current. 9. The control means includes a disconnection detecting means for detecting that at least one of the first fusing means and the second fusing means is in a fusing state, and a notifying means for notifying a user, wherein the disconnection is performed. Detecting means for detecting said first fusing means and said second fusing means;
9. The power generating apparatus according to claim 8, wherein when it is detected that at least one of the fusing means is in a fusing state, it is notified that the electric motor is in a disconnected state. 10. An electric washing machine provided with the power generation device according to claim 8.