JP2002027785A - Inverter and washing machine or cleaner utilizing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small size and light weight inverter. SOLUTION: An inverter circuit 38 is connected to a rectifier circuit 32 which is connected to an outlet of the commercial power supply 31 to output a ripple voltage. Moreover a reluctance motor 5 is connected to the same rectifier circuit 32. As a result, the output frequency of the inverter circuit 38 is set larger than the ripple frequency of the ripple voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to general households and factories,
The present invention relates to an inverter device, such as an air conditioner, a household appliance, a rotary cooker, etc., used in a store or an office, and an electric washing machine.

[0002]

2. Description of the Related Art FIG. 14 shows a circuit diagram of a vacuum cleaner having a conventional inverter device.

FIG. 14 shows a commercial power supply 1 of 100 V and 60 Hz, a rectifier circuit 2 connected to the commercial power supply 1, and a smoothing circuit 3 connected to an output of the rectifier circuit 2. The rectifier circuit 2 is of a full-wave type and includes diodes 4, 5, 6, 7
The smoothing circuit 3 is composed of a choke coil 8 and an electrolytic capacitor 9. The choke coil 8 is formed by laminating a silicon steel plate and winding a copper wire around an iron core provided with a gap. And L has an inductance of 3 mH, and the capacitor 9 has a capacitance of C = 4700.
It has a capacitance of microfarads. The inverter circuit 10 operates by receiving the DC voltage V1 from the smoothing circuit 3 and includes switching elements 11, 12, 13, 1
4, 15, and 16. Electric motor 17
Are connected to the output of the inverter circuit 10 and have an inner rotor structure, which includes stator windings 18, 19, and 20 and a rotor 21 located inside and rotatably provided by a bearing or the like. The rotor 21 uses a permanent magnet, and generates torque by interaction with a current flowing through the stator windings 18, 19, and 20.

Further, the motor 17 is provided with Hall ICs 22 and 2
3 and 24 for detecting the position of the magnetic pole of the rotor 21 and outputting a position detection signal.

[0005] The control circuit 25 receives a position detection signal from the electric motor 17 and switches the switching elements 11, 12, 13, 1.
The drive current is supplied from the inverter circuit 10 to the electric motor 17 by controlling ON, OFF of the switches 4, 15 and 16 in order.

With the above configuration, the inverter device 26
And an impeller-type fan 27, which is a load, is connected to the rotor 21 of the electric motor 17 and rotates. FIG. 15A shows the input voltage V1, and FIG. 15A shows the waveform of the input current Iin from the commercial power supply 1. The smoothing circuit 3 has a voltage pulsation component (a ripple component) at the output of the rectifier circuit 2 that has been subjected to full-wave rectification. The frequency of the pulsation (ripple frequency) is twice the frequency of the commercial power supply 1, and becomes 120 Hertz when the commercial power supply 1 is 60 Hertz.

In the prior art, since the choke coil 8 and the capacitor 9 are provided, the inverter circuit 10
The ripple voltage of the input voltage V1 is considerably absorbed, and the peak-to-peak is suppressed to 10 volts.

[0008]

In such a conventional technique, the choke coil 8 and the capacitor 9 constituting the smoothing circuit 3 are large in weight, volume and cost, so that the weight, volume and cost of the apparatus are large. Has a first problem that the size of the document becomes considerably large.

Further, the waveform of the current Iin supplied from the commercial power supply 1 to the apparatus is considerably deviated from the voltage waveform (sine wave) of the commercial power supply 1, and the peak current is large and the power factor is low. There is a second problem that the loss of the system becomes large and the utilization factor of the power distribution equipment becomes low. In particular, since the motor 17 using a permanent magnet is used, the induced electromotive force corresponding to the speed is generated by the stator windings 18 and 1.
9 and 20, the ripple voltage of V1 needs to be reduced in order to effectively use the torque of the electric motor 17 even near the zero volt point of the commercial power supply 1.

The first problem and the second problem are that the rectifier circuit 2 has a configuration other than the full-wave type shown in FIG. 6, for example, a voltage doubler in which two electrolytic capacitors are connected in series. Even in the case of the shape configuration, they were almost the same.

Further, since a permanent magnet is used for the rotor 21, there is a third problem that the rotor 21 is expensive.

[0012]

SUMMARY OF THE INVENTION In order to solve the first to third problems, the present invention provides a commercial power supply, a rectifier circuit connected to an output of the commercial power supply and outputting a pulsating voltage, An inverter circuit connected to the output of the rectifier circuit, and a reluctance motor driven by the inverter circuit, the motor having a first object having a winding and an iron core, and an iron core And an inverter device having a second object movably provided with respect to the first object, wherein an output frequency of the inverter circuit is higher than a ripple frequency of the pulsating voltage. With this configuration, a device having a high input power factor can be realized while reducing weight, volume, and cost, and an expensive permanent magnet is not required.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 of the present invention
In order to solve the above problems, a commercial power supply, a rectifier circuit connected to an output of the commercial power supply to output a pulsating voltage, an inverter circuit connected to an output of the rectifier circuit, and the inverter circuit A first object having a winding and an iron core, and a second object having an iron core and movably provided with respect to the first object. A small and inexpensive inverter device is realized by having an object and having a configuration in which the output frequency of the inverter circuit is higher than the ripple frequency of the pulsating voltage.

According to a second aspect of the present invention, the motor of the inverter device according to the first aspect has a configuration in which the number of teeth of the first iron core is an integral multiple of the number of teeth of the first iron core. The torque for the current supplied to the wire is increased,
It is an object of the present invention to provide an inverter device that is lightweight and has high torque and high efficiency.

According to a third aspect of the present invention, the number of teeth of the first iron core of the inverter device motor according to the first or second aspect is set to 12, each tooth is provided with a coil, and a one-phase winding is provided. 4 lines
Adjacent coils in the same phase are connected so that they have different polarities, so that the attraction force generated by the current supplied to the winding acts evenly on the axis. With this configuration, an inverter device with small vibration is realized.

The invention described in claim 4 is the first invention.
The washing machine according to any one of 3, wherein the washing shaft is rotated by an electric motor at the time of washing, and the spinning shaft is rotated by the electric motor at the time of spinning, so that the rotation of the electric motor is not performed via a speed reduction mechanism or the like. An electric washing machine having a small-sized and low-cost drive unit configuration for the washing shaft or the spin-drying shaft can be configured by adopting a configuration in which the transmission is performed to the washing shaft or the spin-drying shaft. The inverter device and the invention according to claim 5 include the inverter device according to any one of claims 1 to 3 and a speed reduction mechanism having a predetermined speed reduction ratio. The electric washing machine can be configured as a small-sized and low-cost electric motor by supplying power from the output of the motor through the speed reduction mechanism and rotating the dewatering tub without decelerating the output of the electric motor during dehydration. .

The invention described in claim 6 is the first invention.
3. By having the inverter device according to any one of (3) and (3), the rotation axis of the washing wing during washing or the rotation axis of the spinning tub during dehydration and the rotation axis of the electric motor are the same rotation axis. An object of the present invention is to realize a highly reliable electric washing machine having a simple structure of a mechanical part. The center of gravity of the washing tub and the dewatering tub is located substantially at the center of the rotating shaft, whereby stable rotation is obtained, and vibration during operation is reduced.

The invention described in claim 7 is the first invention.
3. The configuration of the electric vacuum cleaner driven by the inverter device according to any one of the items 3 has a suction fan for suction, whereby the configuration of the inverter device is simple and high-speed rotation can be obtained. Things. The rotating drive unit is low in cost and lightweight and small, and the small motor constitutes a small and lightweight vacuum cleaner.

[0019]

Next, specific examples of the present invention will be described.

Embodiment 1 FIG. 1 is a circuit diagram of a vacuum cleaner having an inverter device according to Embodiment 1 of the present invention.

In FIG. 1, a commercial power supply 31 of 100 V and 60 Hz and a rectifier circuit 32 connected to the commercial power supply 31 are provided. The rectifier circuit 32 is of a full-wave type, is composed of diodes 33, 34, 35 and 36, and outputs a pulsating voltage V1. The output of the rectifier circuit 2 has a small size having a capacitance of 4.7 microfarads.
A lightweight plastic film type capacitor 37 is connected.

The inverter circuit 38 operates by receiving the pulsating voltage V1 from the rectifier circuit 32, and operates by a power MOSFET.
T, switching elements 39, 40, 4
1, 42, 43, 44 and silicon diodes 45, 46, 47, 48, 49, 50.

The motor 51 is connected to the output of the inverter circuit 38 and is a type of a reluctance type motor utilizing a magnetic attraction, and particularly belongs to a type called a switch reluctance motor. Things.

The electric motor 51 has three-phase windings 52, 53, 5
4, and a second body 55 with magnetic asperities, commonly referred to as a rotor or rotor.

The control circuit 56 controls the ripple frequency 1 of the pulsating voltage V1 from the rectifier circuit 32 in a steady state of use.
Switching elements 39, 40, 41, 42, 43, 44 at a frequency of 7 kHz, much higher than 20 Hz.
Are controlled in order, so that the inverter circuit 38 supplies a driving current of 7 kHz to the electric motor 51 and operates at an output frequency of 7 kHz.

With the above configuration, the inverter device 57
And an impeller-type blower fan 58 serving as an additional load is directly connected to a rotor 55 of the electric motor 51 so as to rotate and operate.

The position detecting means 59 provided in the electric motor 51 optically detects the rotational position of the second object 55 and outputs a signal corresponding to the position to the control circuit 56. It has become.

FIG. 2 is a detailed structural view of the electric motor 51.

A first object 60 generally called a stator or a stator is composed of a first iron core 61 formed by stacking silicon steel plates and a portion of a total of twelve teeth 82 provided inside the first iron core 61. And twelve coils 70 to 81 provided by winding an enameled wire.

The second object 55 has a second iron core 62 also formed by stacking silicon steel plates, and is rotated concentrically with the first object 60 relative to the first object 60. It is provided freely.

A total of one tooth 82 is provided inside the first iron core 61.
There are two coils 70 to 81, each of which has a first iron core 6
It is wound around one tooth.

In particular, in the present embodiment, the centers of the twelve coils are not all provided at the same angle, but the angle between the teeth and the center of the teeth is alternately repeated by two types of angles. It is configured to be separated.

That is, the angle between the coils 70 and 71 is 25.7 degrees, and the angle between the coils 71 and 72 is 3
4.3 degrees and the angle between the coils 72, 73 is 25.
7 degrees, the angle between coils 73 and 74 is 34.3 degrees, the angle between coils 74 and 75 is 25.7 degrees, and the angle between coils 75 and 76 is 34.3 degrees. And
The angle between coils 76, 77 is 25.7 degrees, the angle between coils 77, 78 is 34.3 degrees, and coil 7
The angle between 8, 79 is 25.7 degrees, and the coil 79,
The angle between 80 is 34.3 degrees and the coils 80, 81
Is 25.7 degrees, and the angle between the coils 81 and 70 is 34.3 degrees.

Here, 25.7 degrees is obtained by converting 360 degrees to 14
(The number of teeth of the second object 55), which is 34.3.
The degree is an angle obtained by subtracting the aforementioned 25.7 degrees from 60 degrees.

Note that 60 degrees is an angle obtained by dividing 360 degrees by 6.

FIG. 3 shows the winding 5 of the electric motor 51 of this embodiment.
It is a connection diagram of 2,53,54.

The U-phase winding 52 includes coils 70, 71, 7
6, 77 connected in series, and the V-phase winding 53
Is configured by connecting coils 72, 73, 78, and 79 in series, and the W-phase winding 54 includes coils 74, 75, 80,
81 are connected in series to form a three-phase configuration.

In FIG. 3, a black circle attached to each coil is
It indicates the polarity of the coil, and indicates that when a current is supplied from the terminal marked with a black circle to each coil, an N pole is generated on the side facing the second object, that is, on the inside. Is what it is.

Therefore, for example, the U-phase adjacent coil 7
0 and 71 are supplied with current from the U1 terminal,
An N pole and an S pole are generated respectively, and similarly, the coils 76 and 77 also generate an N pole and an S pole, respectively, that is, adjacent coils in the same phase have different poles.

When a current is supplied to the U-phase winding 52, the switching elements 39 and 42 are both turned on and the switching elements 39 and 42 are turned off, and the magnetic energy stored in the inductance of the winding 52 becomes , And are collected by the condenser 37 through the diodes 45 and 48, and the same applies to the V phase and the W phase.

In order to increase or decrease the value of the current supplied to each winding, for example, the switching element 39 is turned on and off at a high frequency such as 50 kHz while the switching element 42 is kept on. And the like, the ratio (duty) can be varied, the operation can be performed with the planar characteristics of torque and speed narrowed, and the speed can be kept constant.

In the present embodiment, the phase order is U, V, W, and when the motor makes one round, the motor 51
At 25.7 degrees in the clockwise direction, and the mechanical rotation of 360 degrees is performed only after 14 times of electrical rotation.

Therefore, when the inverter device is operated at 7 kHz, the mechanical rotation becomes 500 rotations per second, which is 3 times.
The blower fan 58 is driven at 10,000 r / min, and operates satisfactorily as a vacuum cleaner.

Here, the torque generated by the electric motor 51 when the current is supplied to each winding is substantially equal to the square of the current value multiplied by the angular differential value of the inductance of each winding and divided by two. Therefore, it is necessary to supply the current at the timing when the inductance increases and to obtain the mechanical output efficiently, and this is realized by the operation of the position detecting means 59.

With the above configuration, in the vacuum cleaner of the present embodiment, the inverter device 51 drives the blower fan 52 to rotate, sucks dust together with air, and can perform a cleaning operation.

FIG. 4 is an operation waveform diagram of the smoothing circuit and the DC power supply according to the first embodiment.

FIG. 4A shows the input voltage V1 of the inverter circuit 38 of the inverter device according to the first embodiment.
Shows the waveform of the input current Iin from the commercial power supply 31, and FIG. 3 (c) shows the waveform of one of the input currents IM of the three-phase motor 51. The rectifier circuit 32 is a substantially full-wave rectified output voltage, and has a pulsating component (a ripple component) of a voltage that varies between 140 volts and 15 volts at the maximum.

The frequency of the pulsation (ripple frequency) is twice the frequency of the commercial power supply 1, and becomes 120 Hertz when the commercial power supply 1 is 60 Hertz. In this embodiment, since the capacitance of the capacitor 37 provided at the output of the rectifier circuit 32 is small, the input voltage V1 of the inverter circuit 38 is small.
Has a considerable amplitude.

The electric current supplied to the motor 51 is shown in FIG.
As shown in (c), the waveform has a waveform of 1 kHz having an envelope having almost the same shape as the input voltage V1 of the inverter circuit 38.

In this embodiment, since the motor 51 is formed by using a reluctance motor, the induced electromotive force proportional to the speed is fixed, as in the motor using a permanent magnet of the prior art. It does not occur in the child winding,
Therefore, similarly to the case where power is supplied to the resistor, a current substantially proportional to the instantaneous value of the voltage V1 is generated.
8 to the electric motor 51 to supply mechanical power.

Accordingly, the input current Iin of the apparatus from the commercial power supply 31 has a waveform substantially similar to a sine wave as shown in FIG. 4A, and has a high power factor and a low peak current value. Therefore, there is no adverse effect on other electrical devices connected to the system, and the burden on the distribution system can be reduced, the utilization rate of the distribution device can be increased, and the loss can be almost minimized. It will be. According to an experiment by the inventor, when the bottom value (the voltage value at the lowest point due to pulsation) is 50% or less of the peak value of the voltage input to the inverter circuit 38, the above effect is large. I know it will be what you get.

The plastic film type capacitor 37 used in the first embodiment is smaller, lighter, less expensive, and has a longer life than the electrolytic type capacitor used in the prior art. In addition, since a large, heavy, and expensive choke coil is not used, there is a great effect in reducing the size, weight, cost, and reliability of the device.

However, when it is necessary to suppress line noise or the like, for example, a normal mode or common mode choke coil can be connected in series with the input from the commercial power supply 31 or the output of the rectifier circuit 32. Even in such a case, the required inductance value can be smaller than that used in the conventional technology, so that the effect of the present invention can be sufficiently enhanced.

The switch reluctance monitor is
Since this is a kind of synchronous machine, the frequency of the inverter circuit 38 is gradually increased from zero at the time of start-up, and a period of time lower than the ripple frequency 120 V of the voltage across the capacitor 37 occurs. However, in this embodiment, since the load is the blower fan 52, the input power of the inverter device 51 immediately after startup is only about one-fifth of the steady-state operating condition due to the relationship between speed and torque. Therefore, immediately after the start, the voltage smoothing effect by the capacitor 37 acts considerably.

Therefore, at the time of starting, the starting operation can be performed satisfactorily.

Particularly, in this embodiment, the magnetic flux generated when a current is supplied to one phase, for example, the W phase, is generated at a position separated by a mechanical angle of 180 degrees from each other as shown by a broken line in FIG. Therefore, the attractive force of the magnetic flux is symmetrical with respect to the central axis, and the generation of vibration can be suppressed.

Further, the magnetic flux indicated by the broken line in FIG. 2 is completed between adjacent coils having different polarities, so that the magnetic flux hardly passes near the center axis, and the hollow portion without the iron core in this portion is used. Even if the internal core is effectively used as the iron core configuration, it will function satisfactorily.

However, such a winding configuration having 12 coils is not always necessary, but a configuration of 3 coils, that is, a configuration in which each winding is provided at a mechanical angle of 120 degrees, or a configuration of 6 coils is provided. If the inductance of the winding of each phase changes according to the angle of rotation, reluctance torque is generated, and it functions as an electric motor by using it. Even if ripples are included, the same operation is performed satisfactorily.

(Embodiment 2) FIG. 5 shows a configuration diagram of a motor 51 according to Embodiment 2 of the present invention.
The number of teeth 82 of the first iron core is six and the number of teeth of the second iron core is four.

In the present embodiment, the intervals between the centers of the teeth of the first iron core, that is, the intervals between the coils 87 to 92 are all equally spaced at a mechanical angle of 60 degrees.

The coils 87 to 92 are all wound around the teeth 82 of the first iron core.

FIG. 6 shows a connection diagram of the motor of the second embodiment. That is, when a current is supplied to the U-phase winding 52 from the U1 terminal, the current is supplied to the coils 87 and 90. The coil 87 generates an N-pole inside because a current flows from the terminal indicated by a black circle, and the coil 90 generates an S-pole.

Therefore, in the present embodiment, a magnetic path passing substantially through the center of the second iron core 86 is formed.

Also in this embodiment, since the self-inductance of each winding changes due to the rotational movement of the motor 51, reluctance torque is generated by the current of each winding, and It works.

In the second embodiment, the configuration of the parts other than the electric motor is exactly the same as that of the first embodiment.

Therefore, the above structure operates as a vacuum cleaner.

In this embodiment, the electric motor 51 mechanically makes a 1/4 turn during a period of one electrical cycle. Therefore, when the machine speed is 30,000 revolutions per minute,
The frequency becomes kilohertz, which is lower than that in the first embodiment.

Therefore, the switching loss of the switching elements 39 to 44 of the inverter circuit 38 can be suppressed lower than in the first embodiment, and the iron loss can be reduced.

When the switching frequency is low, the switching elements 39 to 44 can be realized as devices with high efficiency even as IGBTs.

(Embodiment 3) FIG. 7 is a view showing the configuration of a motor 51 according to Embodiment 3 of the present invention.
And the configuration of the second iron core 94, the number of teeth 82 of the first iron core is set to six, and two small teeth 87 for one tooth 82.
a, 87b, that is, the total number of small teeth is 1
The number is two, which is twice the number 6 of the teeth of the first iron core, that is, an integral multiple.

The number of teeth 83 of the second iron core is ten.

In this embodiment, as in the second embodiment, the distance between the centers of the teeth 82 of the first iron core, that is, the coils 87 to
The intervals 92 are all equally spaced at a mechanical angle of 60 degrees, and are all wound around the teeth 82 of the first iron core.

In this embodiment, since the connection diagram of the motor is the same as that shown in FIG. 6, for example, when a current is supplied to the U-phase winding 52 from the U1 terminal, the coil 87,
Although current flows through the coil 90, the coil 87 generates an N-pole inside because current flows from the terminal indicated by the black circle, and the coil 90
Generate poles.

Therefore, also in the present embodiment, a magnetic path passing substantially through the center of the second iron core 94 is formed.

Also in the present embodiment, since the self-inductance of each winding changes due to the rotational movement of the motor 51, reluctance torque is generated by the current of each winding, and It works.

Also in the third embodiment, the configuration of the parts other than the electric motor is exactly the same as that of the first embodiment.

Thus, the above-described configuration operates as a vacuum cleaner.

In the third embodiment, the small teeth 87a, 87b
Is provided, the electric motor 51 mechanically makes one-tenth revolution during a period of one electrical cycle. Therefore, when the machine speed is 30,000 revolutions per minute, it becomes 5 kilohertz.

(Embodiment 4) FIG. 8 shows a configuration diagram of a motor 51 according to Embodiment 4 of the present invention.
And the configuration of the second iron core 96, the number of teeth 82 of the first iron core is set to six, and three small teeth 87 for one tooth 82.
a, 87b, 87c, that is, the total number of small teeth is 18, which is three times the number 6 of teeth of the first iron core, that is, an integral multiple.

The number of teeth 83 of the second iron core is sixteen.

In this embodiment, as in the second embodiment, the distance between the centers of the teeth 82 of the first iron core, that is, the coils 87 to
The intervals 92 are all equally spaced at a mechanical angle of 60 degrees, and are all wound around the teeth 82 of the first iron core.

Also in this embodiment, the connection diagram of the motor is the same as that shown in FIG. 6. For example, when a current is supplied from the U1 terminal to the U-phase winding 52, the current flows through the coils 87 and 90. The coil 87 generates an N pole inside because a current flows from a terminal indicated by a black circle, and the coil 90 generates an S pole.

Therefore, also in the present embodiment, a magnetic path passing through the substantially central portion of the second iron core 94 is formed.

Also in this embodiment, since the self-inductance of each winding changes due to the rotational movement of the motor 51, reluctance torque is generated by the current of each winding, and It works.

Also in the fourth embodiment, the configuration of the parts other than the electric motor is exactly the same as that of the first embodiment.

[0086] Thus, the above-described configuration operates as a vacuum cleaner.

In the third embodiment, the small teeth 87a, 87
Since b and 87c are provided, the electric motor 51 mechanically makes 1/16 turn during a period of one electrical cycle.
If the machine speed is 30,000 revolutions per minute, it will be 8 kilohertz.

(Embodiment 5) FIG. 9 is a view showing the configuration of a motor 51 according to Embodiment 5 of the present invention.
And the configuration of the second iron core 98, the number of teeth 82 of the first iron core is set to six, and four small teeth 87 for one tooth 82.
a, 87b, 87c, 87d, that is, the total number of small teeth is 24, and the number of teeth of the first core is 6
, That is, an integer multiple.

The number of teeth 83 of the second iron core is 22.

In this embodiment, as in Embodiment 2, the distance between the centers of the teeth 82 of the first iron core, that is, the coils 87 to
The intervals 92 are all equally spaced at a mechanical angle of 60 degrees, and are all wound around the teeth 82 of the first iron core.

Also in this embodiment, the connection diagram of the motor is the same as that shown in FIG. 6. For example, when a current is supplied from the U1 terminal to the U-phase winding 52, the current flows through the coils 87 and 90. The coil 87 generates an N pole inside because a current flows from a terminal indicated by a black circle, and the coil 90 generates an S pole.

Therefore, also in the present embodiment, a magnetic path passing through a substantially central portion of the second iron core 98 is formed.

Also in this embodiment, since the self-inductance of each winding changes due to the rotational movement of the motor 51, reluctance torque is generated by the current of each winding, and It works.

Also in the fourth embodiment, the configuration of the parts other than the electric motor is exactly the same as that of the first embodiment.

Thus, the above-described configuration operates as a vacuum cleaner.

In the third embodiment, the small teeth 87a, 87
Since b, 87c, and 87d are provided, the electric motor 51 mechanically makes a 1/22 turn during a period of one electrical cycle. If the machine speed is 30,000 revolutions per minute, 1
1 kilohertz.

As described above, when the output frequency of the inverter circuit 38 is high, the on / off frequencies of the switching elements 39 to 44 of the inverter circuit 38 are also high, and control by PWM or chopping is added. In this case, the switching frequency is several times or more, but in this embodiment, since the MOSFET is used as the switching element, the turn-on loss and the turn-off loss are low even in the high-frequency switching operation. , And a highly efficient device can be realized. (Embodiment 6) FIG.
0 shows a configuration diagram of the electric washing machine in the sixth embodiment.

In the sixth embodiment, the output of the inverter device 57 provided with the motor 51 in the inverter circuit 38 shown in the first embodiment is used.

In this embodiment, the second object 100, the washing wing 101 which rotates during washing, and the spin tub 10 which rotates during spinning
Two.

Further, a water receiving tank 103 is provided outside the dehydrating tank 102 so as to be suspended from the casing of the apparatus by a total of four support rods 104.

Regarding the rotation of the washing wing 101 and the spin tub 102, the rotation of the shaft 105 of the electric motor is transmitted to the washing shaft 115 during washing and to the spin shaft 116 during spinning by switching the connection of the clutch 106. Also, the washing wing 101
The rotation of the dewatering tub 102 is the same as the axis of rotation.
At the time of washing, the washing wing 101 and the washing shaft 115 are driven at the same rotation speed as the electric motor 51.
Similarly, the motor is driven at the same speed as the electric motor 51.

FIG. 11 is a diagram showing the configuration of the electric motor 51 according to the sixth embodiment. The configuration of the first iron core 107 and the second iron core 108 is assumed to be 12 with the number of teeth 82 of the first iron core. Four small teeth 70a, 70b for one tooth 82,
70c and 70d are provided, that is, the total number of small teeth is 48, which is four times the number 12 of teeth of the first iron core, that is, an integer multiple.

The number of teeth 83 of the second iron core is 46.

The coils 70 to 81 are formed in the same manner as in the first embodiment.
Both are wound around the teeth 82 of the first iron core.

Also in this embodiment, the connection diagram of the motor is the same as that of FIG.

Therefore, electric motor 51 is connected to first iron core 107.
Has 12 teeth, and each tooth is provided with a coil 70-81.

The one-phase winding has a three-phase configuration in which four coils are connected in series. Adjacent coils of the same phase, for example, U-phase coils 70 and 71, They are connected so as to have different polarities.

In this embodiment, as in the first embodiment,
Since no magnetic flux passes through the center of the second iron core 108, the second iron core 108 has a hollow shape.

For this reason, it is possible to provide a bearing structure such as a bearing in the cavity or a structure such as a clutch for connecting and disconnecting the dewatering tub 102, thereby realizing a small electric washing machine. It is possible to adopt a suitable configuration.

Also in the present embodiment, since the self-inductance of each winding is changed by the rotational movement of the motor 51, reluctance torque is generated by the current of each winding, and the motor is used as a motor. It works.

Also in this embodiment, the configuration of the parts other than the electric motor is exactly the same as that of the first embodiment.

Therefore, the output of the electric motor 51 is transmitted to the washing wing 101 and the dewatering tub 102 in a direct connection with the shaft by the above configuration, so that the electric motor 51 operates as a fully automatic electric washing machine.

In particular, since the rotation axis of the washing blade 101 during washing or the rotation axis of the spin tub 102 during spin-drying is the same as the rotation axis of the motor 51, the motor 51 is positioned below the center of the spin tub 102. Therefore, it is possible to obtain an effect that the weight is well-balanced and low vibration such as during dehydration can be realized.

In the sixth embodiment, the small teeth 70a, 70
Since b, 70c, and 70d are provided, the electric motor 51 mechanically makes 1/46 revolutions during a period of one electrical cycle.

At the time of washing, since the speed of the washing wings 101 is 150 revolutions per minute, the mechanical speed of the electric motor 51 is equal to this speed, and the output frequency of the inverter circuit 38 is 115 Hz.

At the time of spin-drying, the rotation speed of the motor 51 is 900 revolutions per minute, which is equal to the speed of the spin-drying tub 102, and the frequency operates at 690 Hz.

That is, the rotation speed of the inverter device 57 is controlled in a wide range, and the rotation of the electric motor 51 is transmitted to the washing shaft 115 or the dehydration shaft 116 at the same rotation speed during both washing and dehydration. An electric washing machine can be constructed without the need.

Since the reluctance motor 51 generates torque due to a change in inductance, the induced electromotive force generated in the motor when the speed exceeds a certain value like a motor using only permanent magnets. Is too large, and the characteristic that the driving torque is zero or extremely small does not appear, so that the driving condition of high speed and relatively low torque required for dehydration can be realized without any problem.

In the description of this embodiment, the washing wing 101 is rotated during washing.
6, the washing wing 101 and the dehydration tub 102 may be simultaneously rotated during washing, and washing may be performed by centrifugal force. Also, at the time of dehydration, similarly, the washing wing 101 and the dehydration tub 1
02 rotates simultaneously.

As described above, when the output frequency of the inverter circuit 38 is low, the switching elements 39 to 44
IGBT and the like may be advantageous in characteristics and cost. (Embodiment 7) FIG. 12 is a view showing a structure of a main part of an electric washing machine in Embodiment 7.

In FIG. 12, the electric motor 51 is the same as that described in the sixth embodiment.
9, planetary gears 110, 111, 112, case 113,
A speed reduction mechanism 117 having a ring 114 is connected, and the washing wing 101 is connected to the ring 114.
The dehydration tub 102 is connected to the case 113 coaxially.

At the time of washing, though not shown, the case 113 is fixed in the rotation direction by a brake means, and the shaft 105 of the electric motor 51 causes the sun gear 10 to rotate.
When the planetary gear 9 is rotated, the planetary gears 110, 111, and 112 perform a revolving motion, and the ring 114 connecting the central axes of the respective planetary gears is rotated at a speed reduced to 1/6 of the speed of the sun gear 109, The washing wing 101 is driven to rotate by the spinning shaft 116.

On the other hand, during dehydration, the case 112 is rotatable (not shown), and the case 113 is moved to the sun gear 109 by a clutch mechanism (not shown).
The washing wing 101 and the dewatering tub 102 are both directly connected to the output shaft 105 of the electric motor 51, and are all driven to rotate at the same speed. Become.

As for the other structure in this embodiment, the same structure as that of the sixth embodiment is used, and it operates as an electric washing machine that performs a fully automatic operation from washing to spinning. .

FIG. 13 is a graph showing the characteristics of the driving torque and the speed acting on the washing wing 101 during washing and the dewatering tub 102 and the washing wing 101 during dewatering in the seventh embodiment.

At the time of spin-drying, both the spin-drying tub 102 and the washing wing 101 are directly connected to the shaft 105 of the electric motor 51, so that the characteristics of the electric motor 51 appear as they are. 1 /
The deceleration of 6 is performed, and at the same time, the torque becomes 6 times the value supplied from the electric motor 51.

Therefore, the supply torque from the electric motor 51 can be reduced to 1/6 even when the washing blade is driven during the washing requiring a large torque.

However, the speed is six times that of the washing wings.
Since 50 rotations can provide almost sufficient washing performance, the speed of 900 rotations per minute, which is 6 times that,
The speed of the dewatering tub 102 during the dehydration is almost the same, and the design can be easily performed. As a result, the small motor 51 having a small torque can be used.
Therefore, a very practical configuration can be achieved even with the reduction mechanism 117 in total.

In the present embodiment, the speed reduction mechanism 11
Although the reduction ratio of 7 was set to 1/6, it is not always necessary to be this value.

Also, regarding the structure of the speed reduction mechanism 117,
The present invention is not limited to the configuration using the planetary gears, but may be one using a worm gear, for example.

[0131]

As described above, the invention according to claim 1 of the present invention is particularly applicable to a commercial power supply, a rectifier circuit connected to an output of the commercial power supply to output a pulsating voltage, and an output of the rectifier circuit. An inverter circuit connected to the inverter circuit, and a reluctance motor driven by the inverter circuit, wherein the motor has a first object having a winding and an iron core, and the first object having an iron core. A second object movably provided with respect to the object, and an output frequency of the inverter circuit is:
With a configuration in which the ripple frequency is higher than the ripple frequency of the pulsating voltage, a small and inexpensive inverter device is realized.

The invention according to a second aspect of the present invention is particularly configured such that the motor of the inverter device according to the first aspect has a small number of teeth which is an integral multiple of the number of teeth of the first iron core. It is an object of the present invention to provide a small and lightweight inverter device with high torque and high efficiency while increasing the torque with respect to the current supplied to the winding.

In the invention according to claim 3, the number of teeth of the first iron core of the inverter device motor according to claim 1 or 2 is set to 12, and each of the teeth is provided with a coil to provide one phase. Adjacent coils in the same phase are connected so as to have different polarities so that the attraction force generated by the current supplied to the windings is applied to the shaft. Thus, an inverter device having a small vibration can be realized.

According to a fourth aspect of the present invention, a washing wing or a washing tub for washing is rotated by using the inverter device according to any one of the first to third aspects. By rotating the spin-drying tub with the output of (1), an electric washing machine can be configured as a small and low-cost electric motor.

According to a fifth aspect of the present invention, there is provided an inverter device according to any one of the first to third aspects and a speed reduction mechanism having a predetermined speed reduction ratio. The electric washing machine can be configured as a small-sized and low-cost electric motor by supplying power through the deceleration mechanism and rotating the dehydration tub without decelerating the output of the electric motor during dehydration.

According to a sixth aspect of the present invention, there is provided an inverter device according to any one of the first to third aspects.
The rotation axis of the washing wing during washing or the rotation axis of the spinning tub during dehydration and the rotation axis of the electric motor are the same rotation axis, realizing a highly reliable electric washing machine with a simple mechanism configuration. is there.

According to a seventh aspect of the present invention, there is provided an air conditioner having a blower fan driven by the inverter device according to any one of the first to third aspects. An object of the present invention is to realize a vacuum cleaner which has a simple structure, is low in cost, is lightweight and small in size, and is very easy to handle when performing a cleaning operation.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a vacuum cleaner having an inverter device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of the same electric motor 51;

FIG. 3 is a connection diagram of windings 52, 53, and 54 of the electric motor 51;

FIG. 4 is an operation waveform diagram of each section.

FIG. 5 is a configuration diagram of an electric motor 51 according to a second embodiment.

FIG. 6 is a connection diagram of windings 52, 53, 54 of the electric motor 51.

FIG. 7 is a configuration diagram of a motor 51 according to a third embodiment.

FIG. 8 is a configuration diagram of a motor 51 according to a fourth embodiment.

FIG. 9 is a configuration diagram of a motor 51 according to a fifth embodiment.

FIG. 10 is a circuit diagram of an electric washing machine having an inverter device according to a sixth embodiment.

FIG. 11 is a configuration diagram of the electric motor 51.

FIG. 12 is a configuration diagram of a main part of an electric washing machine according to a seventh embodiment.

FIG. 13 is a characteristic diagram of driving torque and speed of the washing wing and the dewatering tub.

FIG. 14 is a circuit diagram of a vacuum cleaner having an inverter device according to the related art.

FIG. 15 is an operation waveform diagram of the inverter device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 31 Commercial power supply 32 Rectifier circuit 38 Inverter circuit 51 Electric motor 52,53,54 Winding 61,85,93,95,97,106 1st iron core 60 1st object 62,86,94,96,98, 107 Second iron core 55, 100 Second object 57 Inverter device. 82 First Iron Teeth 87a, 87b, 87b, 87d, 70a, 70b, 7
0c, 70d Small teeth 70-81 Coil 117 Reduction mechanism 58 Blower fan

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 1/24 H02K 3/28 K 5H619 3/28 19/10 A 19/10 H02P 7/00 501 (72 ) Inventor Taketoshi Sato 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. EE01 EE02 EE03 FF01 FF02 FF03 FF04 FF05 GG01 HA08 HB02 HB07 HB16 5H603 AA01 BB01 BB09 BB12 CA01 CA05 CB01 CC11 CC17 CD01 CD04 CD14 CD21 CE01 5H619 AA01 AA10 BB01 BB06 BB24 PP01 PP02

Claims (7)

[Claims] 1. A commercial power supply, a rectifier circuit connected to an output of the commercial power supply to output a pulsating voltage, an inverter circuit connected to an output of the rectifier circuit, and driven by the inverter circuit. A reluctance-type electric motor, the electric motor comprising: a first object having a winding and a first iron core;
A second object having a second iron core and movably provided relative to the first object, wherein an output frequency of the inverter circuit is higher than a ripple frequency of the pulsating voltage; Inverter device. 2. The inverter device according to claim 1, wherein the first iron core of the electric motor has a small number of teeth that is an integral multiple of the number of teeth of the first iron core. 3. The motor has a first iron core having twelve teeth, a coil provided for each tooth, and a three-phase configuration in which a single-phase winding is composed of four coils, and is adjacent in the same phase. The coil is
The inverter device according to claim 1 or 2, wherein the inverter device is connected to have a different polarity. 4. An electric washing machine using the inverter device according to claim 1, wherein the washing shaft is rotated by an electric motor during washing, and the spinning shaft is rotated by the electric motor during spinning. 5. An inverter device according to claim 1, further comprising a speed reduction mechanism having a predetermined speed reduction ratio, wherein power is supplied from the output of the electric motor via the speed reduction mechanism during washing. An electric washing machine that rotates the spin-drying tub without decelerating the output of the electric motor during spin-drying 6. An electric washing machine comprising the inverter device according to claim 1, wherein the washing shaft or the dehydrating shaft and the rotating shaft of the electric motor have the same rotation axis. 7. An electric vacuum cleaner having a suction blower fan driven by the inverter device according to claim 1. Description: