JPH0458750A - Double stator synchronous induction motor - Google Patents

Abstract

PURPOSE:To increase starting torque and synchronizing torque by setting a phase difference between a rotary field to be produced around an opposing rotor core by a specific one of two stators and a rotary field to be produced around a rotor core opposing to the other stator. CONSTITUTION:A three-phase AC power supply R, S, T is thrown in under a state where stator windings 21, 22 are connected so that the voltages induced in first rotor windings 4a, 42 have phase difference theta equal to zero. Polarity of the stator winding 22 is switched through a switch T2 so that the rotary fields produced by the stator windings 21, 22 have a phase difference theta equal to 180 deg.. A switch T is then closed and exciting voltages Ea, Eb, Ec, -Ea, -Ec are applied, respectively, between the intermediate points of respective stator windings thus producing an eight pole static field. Currents flowing through second rotor windings 43, 44 produce a four pole field in the rotor windings 41, 42 which produces a synchronizing torque together with a four pole rotary field produced by the stator windings 21, 22.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a synchronous motor.

[Conventional technology]

Generally, a synchronous motor requires a starter that accelerates the rotor to the rotation speed of the rotating magnetic field generated by the stator winding, that is, close to the synchronous speed, and DC excitation of the rotor winding. The induction synchronous motor was devised to omit this starter and give the synchronous motor itself its own starting torque.This motor short-circuits the rotor windings at startup and starts the motor as an induction motor. Although not required, brushes are required for DC excitation of the rotor windings required for synchronous operation. In other words, when the rotational speed of the rotor approaches the synchronous speed, the short circuit in the rotor winding is opened and a DC current is passed through the rotor winding from an external DC power source through the brushes to create magnetic poles on the rotor. The magnetic poles are pulled by the rotating magnetic field created by the stator windings, causing the rotor to rotate at a synchronous speed. This brush requires maintenance and inspection, which increases maintenance costs, and there is a desire to develop a synchronous motor with a brushless structure. As a synchronous motor with this brushless structure, there has been a permanent magnet type and a lance type synchronous motor, but since induction motor cannot be started, the starting torque is small, so it is limited to small capacity ones. Furthermore, Ransol-type and inductor-type synchronous motors have the disadvantage of having complicated magnetic path configurations and being large. Also, the method using an AC exciter and a rotating rectifier is similar. In addition, brushless self-excited three-phase synchronous motors that connect diodes to the rotor windings and utilize the harmonic magnetic field generated by the square wave voltage of the inverter have the disadvantage that sufficient output cannot be obtained due to insufficient magnetomotive force of the rotor. . Furthermore, by inserting a diode into one phase of the three-phase stator winding, static excitation is superimposed on the positive phase rotating magnetic field generated by the stator, and the alternating current voltage due to the static magnetic field is applied to the rotor winding rotating at a synchronous speed. There is a brushless self-excited three-phase synchronous motor that generates synchronous torque by inducing a DC current and rectifying it with a diode to excite the rotor winding and applying a positive-phase rotating magnetic field. Since it is impossible to start the induction motor, the starting torque is low due to the eddy current in the rotor core. In addition, in Japanese Patent Publication No. 54-34124, there is a method in which starting is performed using the principle of an induction machine, and synchronous operation is performed by creating a DC magnetic field in the axial direction, which forms magnetic poles in the rotor core. This has the disadvantage that the shaft is asymmetrical with respect to the rotating shaft, causing vibration of the shaft. In addition, in Japanese Patent Publication No. 61-1992, two phases of the three-phase rotor winding are used for synchronous operation, and the remaining one phase is short-circuited, using two rotating magnetic fields of 4 poles and 8 poles that do not interfere with each other. There are some that are used for starting, but the drawback is that the starting torque is small due to the Goerges phenomenon.

[Problem to be solved by the invention]

Therefore, the technical object is to provide a synchronous motor that has a large starting torque and a large synchronous torque, does not require brushes, is easy to maintain and inspect, has a simple structure, and does not require a dedicated starter.

[Means to solve the problem]

In order to solve the above problem, a first rotor core having two rotor cores arranged at an arbitrary interval on the same rotation axis, and each of the two rotor cores having an arbitrary number of poles. a rotor winding and a second rotor winding having a number of poles that is an integral multiple of the number of poles of the first rotor winding;
a rotor having rotor windings and having respective windings connected between the two rotor cores, and two stator cores disposed around the two rotor cores facing each other. and a stator winding in which each of the two stator cores is provided with two windings having a number of poles equal to the number of poles of the first rotor winding and connected in parallel. a stator, in which an excitation voltage is input between intermediate points of each of the two windings per stator, and a connecting portion of the first and second rotor windings to the second rotor; a rectifier circuit connected to rectify the output voltage of the winding and input it to the first rotor winding; and rotation occurring around a rotor core facing a particular stator of the two stators; It is constructed by a voltage phase shifter that creates a phase difference between the magnetic field and the rotating magnetic field generated around the rotor core that faces other stators. In addition, inputting an AC voltage instead of the DC excitation voltage input between the midpoints of each of the two windings per unit, or phase rotation of the voltage input to the stator winding instead of the DC excitation voltage. It is also an effective means to input an AC voltage that has a phase rotation opposite to that of the above. Further, according to the present invention, the above problem is solved by configuring the voltage phase shifter so that the terminals of one stator winding are switched to opposite polarity by a switch.

[For use]

The details of the operation of a multi-stator induction motor and its voltage phase shifting device have been described by the present applicant in Japanese Patent Application No. 128314/1983. However, in the case of the present invention, a case is described in which the voltage phase shift device operates so that the phase difference is 0° at startup and 180° during synchronous operation. The present invention first provides a first rotor winding, a second rotor winding having an integral multiple of the number of poles of the first rotor winding, and a second rotor winding having the same number of poles as the first rotor winding. Stator windings interact only between the stator and rotor, which have the same number of poles, and in this case, the rotating magnetic field of the stator winding does not act on the second rotor winding, which has a different number of poles. It is based on the well-known theory that there is no such thing. According to the first invention, at startup, a voltage is induced in the first rotor winding with the same number of poles by the rotating magnetic field created by the stator winding, regardless of the second rotor winding with a different number of poles. The rotor starts rotating. At this time, the voltage phase shifting device adjusts the windings around each of the two rotor cores so that the voltages induced in the first rotor windings wound around each of the two rotor cores are in phase. The first rotor winding is operated so that a circulating current flows, and the motor is started as a general induction motor. After startup, when the rotational speed of the rotor increases and approaches the rotational speed of the rotating magnetic field, that is, the synchronous speed, the voltage induced in the first rotor winding by the rotating magnetic field becomes smaller. Up to this point, the motor is operating as an induction motor, but when the slip S approaches S=0.05, it enters synchronous operation. This is done as follows. First, there is a difference of 180 degrees between the rotating magnetic field generated around the rotor core that one stator faces of the two stators and the rotating magnetic field generated around the rotor core that the other stator faces. Activate the voltage phase shifter to create a phase difference of °. In this way, the current that had previously been circulating through the first rotor windings provided in each of the two rotor cores will no longer flow, and the current will no longer flow through the connection portion between the first and second rotor windings. Current begins to flow through the rectifier circuit installed in the The current flowing in the first rotor winding due to this rotating magnetic field with a phase difference of 180° stops flowing because the slip becomes zero when the rotor reaches synchronous speed. When a DC excitation voltage is input and applied between the midpoints of each of the two windings per unit, a stationary magnetic field having twice the number of poles as the number of poles of the stator winding is superimposed by this DC excitation voltage. do. This static magnetic field has the same number of poles as the second rotor winding of the rotor, so regardless of the first rotor winding having a different number of poles, the second
The rotor windings interlink with this stationary magnetic field and induce an alternating current voltage. This AC voltage increases as the rotational speed of the rotor increases. Further, as mentioned above, since the rotating magnetic field has a phase difference of 180°, the induced AC voltage does not circulate through the second rotor windings wound around each of the two rotor cores, and the first
Current begins to flow through the rectifier circuit provided at the connection portion of the second rotor winding. By inputting the current rectified by this rectifier circuit to the first rotor winding as the output of the rectifier circuit, the first rotor winding forms magnetic poles and is applied to the rotating magnetic field of the stator winding having the same number of poles. The tension causes the rotor to rotate at a synchronous speed. At this time, the second rotor winding is affected by the DC magnetic field of the DC excitation voltage with the same number of poles, and the first rotor winding is affected by the stator winding with the same number of poles. It is clear that different polar quantities do not interfere. Considering the synchronous torque here, the phase of the rotating magnetic field generated by a particular stator out of the two stators is shifted by 180 degrees from that of the rotating magnetic field generated by the other stator. The direction of current flowing in the second rotor winding of the rotor core facing one stator due to the static magnetic field of the DC excitation voltage and the direction of the current flowing in the second rotor winding of the rotor core facing the other stator Current flows into the rectifier circuit in the opposite direction, producing four magnetic poles in the first rotor winding, the polarity of which coincides with that of the rotating magnetic field. Therefore, since the torque of two rotors is applied, the induction synchronous motor of the present invention has two stators, but its total capacity is equivalent to that of a conventional induction synchronous motor having brushes. As described above, the two-stator induction synchronous motor of the first invention has a large starting torque because it is started using the principle of a conventional induction motor using the first rotor winding at the time of starting. does not require. In addition, at synchronous speed, the first rotor winding forms magnetic poles under the power generation action of the DC excitation voltage and the second rotor winding, and the action of the rectifier circuit, so the synchronous torque is large, and the brushes etc. It has become possible to provide a synchronous motor that does not require maintenance. Next, the second invention will be explained in detail, but since the same effect occurs at the time of startup, the explanation will be omitted, and the explanation will start from the start of synchronous operation. First, there is a difference of 180 degrees between the rotating magnetic field generated around the rotor core that one of the two stators faces and the rotating magnetic field generated around the rotor core that the other stator faces. Activate the voltage phase shifter to create a phase difference of °. By doing this, the current that had previously been circulating through the first rotor windings provided in each of the two rotor cores will no longer flow, and the current will no longer flow through the connecting portions of the first and second rotor windings. Current begins to flow through the rectifier circuit installed in the The current flowing in the first rotor winding due to the rotating magnetic field with a phase difference of 1800 will stop flowing because the slip becomes zero when the rotor reaches synchronous speed. When an alternating current voltage is input and applied between the intermediate points of two windings per coil, this alternating voltage causes a second rotating magnetic field having twice the number of poles of the stator winding to be superimposed. . Since this second rotating magnetic field has the same number of poles as the second rotor winding of the rotor, it acts on the second rotor winding regardless of the first rotor winding having a different number of poles. Here, the second rotor winding is rotating due to the induction effect between the first rotor winding and the stator winding, so when looking at the second rotating magnetic field with reference to the four-pole rotating magnetic field, there is no slippage. S is 5=(1
, 5, and the second rotor winding interlinks with the second rotating magnetic field to have a power generation effect and induce an alternating current voltage. Further, as mentioned above, since the rotating magnetic field has a phase difference of 180°, the induced AC voltage does not circulate through the second rotor windings wound around each of the two rotor cores, and the first
Current begins to flow through the rectifier circuit provided at the connection portion of the second rotor winding. The current rectified by this rectifier circuit is outputted to the rectifier circuit and inputted to the first rotor winding, so that the first rotor winding forms magnetic poles and is connected to the rotating magnetic field of the stator winding with the same number of poles. The tension causes the rotor to rotate at a synchronous speed. At this time, the second rotor winding is affected by the second rotating magnetic field caused by the alternating voltage with the same number of poles, and the first rotor winding is affected by the stator winding with the same number of poles. , it is clear that quantities of different polarities do not interfere with each other. As described above, the two-stator induction synchronous motor of the second invention is
When starting, the first rotor winding starts using the principle of a conventional induction motor, so the starting torque is large and no other special starter is required. Furthermore, at synchronous speed, the first rotor winding receives the second rotating magnetic field, the power generation action of the second rotor winding, and the action of the rectifier circuit to form magnetic poles, so the synchronous torque is large and the brush It has now become possible to provide a synchronous motor that does not require maintenance. Next, the operation of the third invention will be explained, but since the operation is the same at the time of startup, the explanation will be omitted, and the explanation will start from the start of synchronous operation. First, there is a difference of 180 degrees between the rotating magnetic field generated around the rotor core that one stator faces of the two stators and the rotating magnetic field generated around the rotor core that the other stator faces. The voltage phase shifter is actuated to create a phase difference of . In this way, the current that had previously been circulating through the first rotor windings provided in each of the two rotor cores will no longer flow, and the current will no longer flow through the connection portion between the first and second rotor windings. Current begins to flow through the rectifier circuit installed in the The current flowing in the first rotor winding due to this rotating magnetic field with a phase difference of 1800 degrees stops flowing because the slip becomes zero when the rotor reaches synchronous speed. When an AC voltage is input between the respective midpoints of two windings per wire, the phase rotation of which is opposite to the phase rotation of the voltage input to the stator winding, this AC voltage causes the stator to rotate. A second rotating magnetic field having twice the number of poles of the winding and having an opposite phase rotation is superimposed. Since this second rotating magnetic field has the same number of poles as the second rotor winding of the rotor, it acts on the second rotor winding regardless of the first rotor winding having a different number of poles. . Here, since the second rotor winding rotates the same as the first rotor winding and the phase rotation of the second rotating magnetic field is in the opposite direction, the second rotor winding is When looking at the rotating magnetic field, Veri S is 5=15, and the second rotor winding interlinks with the second rotating magnetic field to have a power generating effect and induces an alternating current voltage. Further, as mentioned above, since the rotating magnetic field has a phase difference of 180°, the induced AC voltage does not circulate through the second rotor windings wound around each of the two rotor cores, and the first
In this case, the current does not flow back through the second rotor winding, but rather flows through the rectifier circuit provided at the connecting portion between the first and second rotor windings. By inputting the current rectified by this rectifier circuit to the first rotor winding as the output of the rectifier circuit, the first rotor winding forms magnetic poles and is applied to the rotating magnetic field of the stator winding having the same number of poles. The tension causes the rotor to rotate at a synchronous speed. At this time, the second rotor winding is affected by the second rotating magnetic field caused by the alternating voltage with the same number of poles, and the first rotor winding is affected by the stator winding with the same number of poles. , it is clear that quantities of different polarities do not interfere with each other. The voltage phase shift device was developed by the applicant in Japanese Patent Application No. 1986-1.
No. 28'314 discloses two methods: one is to change the position of the stator by mechanically rotating it around the rotation axis, and the other is to change the stator winding connection using a switch.
It explains one thing. In the case of a synchronous motor, when pulling from startup to synchronous speed,
The present invention reduces the phase difference between the rotating magnetic fields of two stators from 0° to 1°.
800, and the switching is preferably instantaneous, and the switching is preferably instantaneous, and the switching is preferably instantaneous, and the switching between each of the two windings per one stator winding is carried out between the midpoints of each of the two windings according to the first to third inventions. By inputting the excitation voltage and switching the phase difference at the same time using a changeover switch, it becomes easy to achieve synchronous speed. By the way, according to any one of the first to third inventions, the excitation voltage is input between the respective intermediate points of two windings per one stator winding, but the rotating magnetic field of each of the two stators is In order to make the phase difference of 180°, that is, the phase of the excitation voltage input between the respective midpoints of the two windings per one stator, and the two windings per one stator on the other stator. There is a phase difference of 1800 between the phase of the excitation voltage input between the respective midpoints of the stator and the phase of the excitation voltage input between the respective midpoints of the two windings per one stator on the other
Therefore, it is preferable to connect the inputs of one excitation voltage and the other excitation voltage in advance so that the phase difference is 180°. With the above configuration, it is possible to provide a synchronous motor that has a large starting torque, a large synchronous torque, does not require any brushes, is easy to maintain and inspect, has a simple structure, and does not require a dedicated starter. It has become possible. By the way, the power source for exciting the stator winding can be a commercial frequency AC power source or a variable frequency power source using an inverter. Moreover, it can be used in both single phase and polyphase. By using the variable frequency power supply mentioned above, the synchronous speed can be easily changed, and even in that case, it can be started with the starting torque of a normal induction motor, greatly expanding the field of use and making it possible to provide inexpensive synchronous motors. became.

【Example】

Although the present invention will be described in detail mainly with a two-stator induction synchronous motor as its main configuration, it goes without saying that the number of stators is not limited to this. Furthermore, the stator windings may be connected in parallel, in series, in star connection, or in delta connection. Furthermore, it may be 2-phase, 3-phase, or polyphase. The same applies to the rotor winding. The present applicant has already provided a detailed explanation of the structure and operation of an induction motor comprising a plurality of stators, which is a part of the structure of the present invention, in Japanese Patent Application No. 128314/1982. In other words, due to the voltage phase shift device, a rotating magnetic field is generated around the rotor that a specific stator faces from among multiple stators, and a rotating magnetic field is generated around the rotor that faces the other stators. For example, if the phase difference between the It explains in detail that the flow does not flow through the child conductors, but instead flows through the connecting material that connects the rotor conductors between the rotor cores. Further, regarding the configuration of the voltage phase shift device, one that rotates the stator and one that switches the wiring connection of the stator winding are shown, but in the present invention, in particular, the configuration of the voltage phase shift device is When a voltage phase shifter is configured by performing the above, the electrical angle can be instantly switched from 08° to 180°, and therefore it is easy to bring the speed to the synchronous speed. In addition, by installing and communicating a sensor that detects the rotation speed, a DC excitation circuit, and a control device for the voltage phase shifter, it is possible to automate the pull-in to the synchronous speed, and even in the event of a tax adjustment, the rotation speed can be detected. It is possible to immediately switch from synchronous operation to induction motor operation based on a sensor signal, and unlike general synchronous motors, there is no sudden stop due to tax adjustment, making it easy to prevent accidents. A first embodiment of the present invention will be explained with reference to FIG. First, reference numeral 20 indicates the stator side of a two-stator induction synchronous motor. Further, the reference numeral 40 similarly indicates the rotor side. On the stator side 20, stator windings 21 and 22 are provided on each of the two stator cores, and these are connected in series Y-connection to three-phase AC power supplies R, S, and T. Here, the stator windings 21 and 22 are two windings 23 per one stator winding.
．． 24, 25, and 26 are provided and connected in parallel. Furthermore, two windings 23.24 and 25.2 per said one
6, the excitation voltage Ea and -Ea are input between the intermediate points of each phase, and the excitation voltage Eb is also input for the other phases.
, Ec are input in the same way. This excitation voltage is, for example, a rectifier bridge 51°52.5
3 is connected to three-phase AC power supplies R, S, and T, and the output DC voltage is input. Further, the rectifying bridge and the three-phase AC power source are connected via a switch T. Further, windings 25 and 26 of one of the stator windings 22 are provided with a switch T2 for switching the phase difference angle θ to θ-1800 with respect to the stator winding 21. On the other hand, first rotor windings 41 and 42 are provided on each of the two rotor cores provided on the same rotating shaft on the rotor side 40, and these are connected in parallel. Furthermore, on the rotor side 40, second rotor windings 43, 44 are provided for each of the two rotor cores and are connected in parallel. Here, the number of poles of the first rotor winding 41, 42 and the number of poles of the stator winding 21, 22 are both set to 4, and are fixed to the number of poles of the second rotor winding 43, 44. Child winding 21.22-1
The number of poles of the corresponding two windings 23, 24 and 24 are both 8 poles, and the same is true for the other phases. Furthermore, at the connecting portion of the rotor windings between the two rotor cores, the outputs of the second rotor windings 43 and 44 are connected to a rectifier circuit 45.
The DC side output terminal is connected to the diode 46.
It is connected to the first rotor winding 41,42 via. Here, the first rotor winding 41 facing the stator winding 21
Let the voltage induced in the second rotor winding 43 be E in the direction shown in the drawing, and let the voltage induced in the second rotor winding 43 be e in the direction shown in the drawing. Further, the voltage induced in the first rotor winding 42 facing the stator winding 22 is set to EεJ6 in the direction shown in the figure, and the voltage induced in the first rotor winding 42 facing the stator winding 22 is
The voltage induced in the rotor winding 44 of eεJ is
Set it to 6. Here, θ is the voltage phase difference angle. The effect of the above configuration will be explained. First, at startup, the phase difference angle θ of the induced voltage in the first rotor winding 41 and 42 is θ
With the stator windings 21 and 22 connected so that the angle is -0°, turn on the three-phase AC power supplies R, S, and T to start. At this time, the switch T1 is open. In this way, three-phase AC current flows from the three-phase AC power source into the stator windings 21 and 22, producing four rotating magnetic fields of the same phase, and voltages E and Eε are applied to the first rotor windings 41 and 42.
j8 is induced. Since the phase difference angle θ of the induced voltage in this case is θ=06, the current flowing in the first rotor winding 41 and 42 flows in a circular manner through both windings, and the rotor operates according to the principle of an induction motor. Start it up (Figure 2). Here, the number of poles of the second rotor winding 43, 44 is 8, and the number of poles of the stator winding 21, 22 is 4, so there is no mutual interference, and therefore the stator winding 21, 22 No voltage is induced in the second rotor windings 43, 44 by the rotating magnetic field created by the rotor. The second rotor winding 43, 44 is therefore not involved during start-up. This means that starting occurs with the same characteristics as a conventional induction motor, the starting torque is high, and a separate starter is not required. After starting, the rotational speed of the rotor increases and the stator winding 21.
When the rotational speed of the rotating magnetic field of the four poles created by the rotor 22 approaches the synchronous speed of the four poles, the slide S becomes smaller and the induced voltage E in the first rotor windings 41 and 42 becomes smaller. Up to this point, it is operating as an induction motor, but Suberi S is So
, 05, it will be brought into synchronous operation. This is done as follows. First, the two stator windings 21,22 are connected by a voltage phase shifter.
For example, the polarity of the stator winding 22 is switched by the switch T2 so that the phase difference angle θ between the two rotating magnetic fields produced by the two stator windings 21 and 22 becomes θ=180°. In this way, the phase difference angle θ of the induced voltage of the first rotor winding 41, 42 becomes θ=180°, and EεJe=
-E, the current that has been circulating from the rotor winding 41 to the rotor winding 42 stops flowing, and the induction motor no longer functions as an induction motor. Therefore, an eight-pole magnetic field is applied simultaneously to the switch T2. That is, when the switch T is closed, the excitation voltage Ea is applied between the midpoints of the respective windings of the stator windings, which are connected in parallel with two windings per switch. When Eb, Ec, -Ea, -Eb, and -Ec are applied, an 8-pole stationary magnetic field is created since these voltages are DC voltages. Here, the voltages Ea, Eb,
Since Ec, -Ea, -Eb, and -EC have opposite polarities, the phase difference angle θ of the AC voltage induced in the second rotor winding 43, 44 is also θ=180°, and eEje=
- becomes e. Therefore, the current flowing in the second rotor winding 43.44 flows toward the rectifier circuit 45, and this current is rectified and flows through the diode 46 to the first rotor winding 41.42. The direct current component produces four magnetic poles in the rotor windings 41, 42, and the stator windings 21, 42. ．． A synchronous torque is generated by the four-pole rotating magnetic field created by the rotor 22, and the rotor enters synchronous operation. Here, the number of poles of the first rotor winding 41, 42 and the number of poles of the static magnetic field are different, so there is no mutual interference between the two, and the number of poles of the rotating magnetic field and the static magnetic field of the stator winding 21, 22 are also different. Therefore, there is no mutual interference between the two, and the rotor is operated as a pure four-pole synchronous motor, so the synchronous torque is also large. The method of simultaneously creating two magnetic fields with different numbers of poles using the same stator winding is detailed in Japanese Patent Publication No. 2-18038. The induction synchronous motor of the present invention uses the method of creating two magnetic fields with different numbers of poles from the above-mentioned publication, but the present invention enables high-torque induction motor starting, which was impossible with the synchronous motor of the publication. The present invention has novel effects that have been made possible in a two-stator induction synchronous motor. Next, let's consider the case of loss of synchronization. When the step out occurs, the induced voltages E and -E in the first rotor winding 41.42 due to the four-pole rotating magnetic field created by the stator winding 21.22 increase, and this voltage causes the diode 46 and the rectifier circuit to A rectified current flows through the first rotor windings 41 and 42 through the rotor windings 41 and 45, thereby producing an effect of preventing tax adjustment. Further considering the synchronous torque, during synchronous operation, the phase of the rotating magnetic field created by the stator winding 22 is shifted by 180° with respect to that of the stator winding 21 by the voltage phase device, so the 8-pole The polarity of the magnetic poles formed in the first rotor winding 41 and 42 by the direct current flowing through the second rotor winding 4344, the rectifier circuit 45, and the diode 46 due to the static magnetic field created by the is equal to that of the four-pole rotating magnetic field, the synchronous torques are in the same direction in the two rotor cores, and the synchronous torques are added.Although the induction synchronous motor of the present invention has two stators, Its total capacity is comparable to an induction synchronous motor with conventional brushes. As described above, since the two-stator induction synchronous motor of the present invention is started based on the principle of a conventional induction motor, the starting torque is large, and therefore no other special starter is required. In addition, in synchronous operation, a static magnetic field that does not interfere with the rotating magnetic field created by the stator winding is used, so the synchronous torque is large.
It has become possible to provide a synchronous motor that does not require maintenance such as brushes. Next, a second embodiment of the present invention will be explained with reference to FIG. However, since the rotor side 40 is the same as that of the first embodiment, the description thereof will be omitted. On the stator side 20, stator windings 21 and 22 are provided on each of the two stator cores, and these are connected in series Y-connection to three-phase AC power supplies R, S, and T. Moreover, the stator windings 21, 22 are divided into two windings 23.
24, 25, and 26 are provided and connected in parallel. Furthermore, two windings 23, 24 and 25.
The configuration is such that alternating current voltages Ea and Ea- of the same phase rotation as the rotating magnetic field of the four poles are input between the intermediate points of each of the 26, and the alternating current voltages Eb, Eb-, Ec, E
Enter c- in the same way. For example, transformers 61, 62, and 63 are connected to three-phase power supplies R, S, and T, and the output AC voltage is inputted. Further, the transformer and the three-phase AC power source are connected via a switch T1. Further, the windings 25 and 26 of one of the stator windings 22 are provided with a switch T2 for switching the phase difference angle θ to θ-180' with respect to the stator winding 21. The rotor side 40 is the same as in the first embodiment. Here, the number of poles of the rotor winding 41.42 and the number of poles of the stator winding 21.22 are both 4 poles, and the number of poles of the rotor winding 41.42 is the same as that of the second rotor winding 43.4.
4 poles and the number of poles in the case of excitation from between the respective midpoints of the two windings 23, 24 and 25.26 corresponding to 1 of the stator winding 21.22 is 8 poles. The same applies to other phases. The effect of the above configuration will be explained. First, the switch T1 is opened, and the switch T2 is activated by switching so that the phase difference angle θ of the induced voltage of the first rotor winding 41, 42 becomes θ=0°. The explanation regarding the start-up at this time is the same as that in the first embodiment, and will be explained from the point where the system is brought into synchronous operation. Firstly, the two stator windings 21.22 are
For example, the polarity of the stator winding 22 is switched by the switch T2 so that the phase difference θ between the two rotating magnetic fields produced by the two stator windings 21 and 22 becomes θ=180'. In this way, the phase difference angle 61 of the induced voltage of the first rotor winding 41, 42 = lH°, Eεje = -E
Therefore, the current that has been circulating from the rotor winding 41 to the rotor winding 42 stops flowing, and the motor no longer functions as an induction motor. Therefore, an eight-pole magnetic field is applied simultaneously to the switch T2. That is, when the switch T1 is closed, an alternating current voltage Ea is generated between the midpoints of the respective windings of the stator windings, which are connected in parallel with two windings per one winding. Eb, Ec, -Ea--Eb--Ec- are input, and since these voltages are AC voltages of the same phase, a second rotating magnetic field of eight poles is generated. Here, Ea and -Ea- are the phase difference θ
=180°. The second rotor winding 43.44 is connected to the first rotor winding 41.
While rotating at the rotation speed of 42 poles, it interlinks with the second rotating magnetic field of 8 poles at different speeds, and the second rotating magnetic field of 8 poles causes the second rotor winding 43. produces an alternating voltage. The phase difference angle θ of the AC voltage induced in each of the second rotor windings 43 and 44 is also θ-180°. Therefore, the current flowing in the second rotor winding 43.44 flows toward the rectifier circuit 45, and this current is rectified and flows through the diode 46 to the first rotor winding 41.42. Four magnetic poles are generated in the rotor windings 41, 42 by the direct current, and a synchronous torque is generated by this and the four-pole rotating magnetic field created by the stator windings 21, 22, and the rotor enters synchronous operation. As shown in Fig. 4, the second rotor windings 43 and 44 have a synchronous speed of 8 poles, but they rotate in the same way as the 4-pole rotor windings when the 4-pole slip S = 0. Because it is, originally 4
The rotor windings 43 and 44, which should rotate in the vicinity of S=G, 5, based on the synchronous speed of the poles, have a power generation function. Here, slip S indicates the slip of the rotor with respect to the synchronous speed of the four poles. Next, a third embodiment of the present invention will be explained with reference to FIG.
Only the parts different from the second embodiment will be explained. In the second embodiment, the stator winding 23. 24 and 2
5.26 are connected in parallel and two windings 23.
24, 25, and 26, the AC voltage with the same phase rotation as the four-pole rotating magnetic field is input, but in the third embodiment, the phase rotation is opposite to the four-pole rotating magnetic field. This shows what inputs the AC voltage. As shown in Fig. 5, the windings that input the AC voltages Ea, Eb, and Ec on the output side of the transformers 61, 62, and 63 are replaced so that the phase rotation is opposite to that of the four-pole rotating magnetic field. In this example, AC voltages Eb, Ec and -
Eb- and -Ec- are exchanged. In this case, the AC voltages Ea, Eb, Ec, -Ea
The second rotating magnetic field generated by the input of =, -Eb -, -Ec - has eight poles. To further explain with reference to FIG. 4, the slip S of the rotor with respect to the synchronous speed of the four poles is S=1. It becomes 5. Therefore, compared to the second embodiment described above, the slip with respect to the synchronous speed of the four poles is large, and the second rotor winding 43.44
The number of linkages between the 8-pole rotating magnetic field and the 8-pole rotating magnetic field increases, and as a result, the power generation effect also improves. When the induced voltage in the rotor windings 43, 44 becomes thicker, the four magnetic poles generated in the rotor windings 41, 42 also become stronger, and the synchronous torque also becomes larger. In this embodiment, the voltage phase shift device creates a phase difference in the induced voltage of the rotor winding by changing the connection of the stator winding, that is, by swapping both terminals of the stator winding and connecting them to opposite polarities. Electrically change the phase difference angle θ from θ=0° to θ=180
Switching to °. In addition, in this embodiment, a combination of 4 poles and 8 poles is described in order to prevent mutual interference between the rotating magnetic field and the stationary magnetic field, but a combination of 2 poles and 6 poles is also possible, and the present invention is not limited to this. . Further, in this embodiment, a method using a commercial power source as a power source has been described, but it is also possible to operate at any synchronous speed by using a variable frequency power source such as an inverter.

【effect】

From the above configuration, the two-stator induction synchronous motor of the present invention performs startup with the same torque characteristics as a conventional induction motor, and shifts to the synchronous speed from around S = [105, for example, when the synchronous motor It operates using torque characteristics. This two-stator induction synchronous motor does not require a starter or brushes, so it has a simple structure and configuration, and it can be started with the same torque characteristics as a conventional induction motor, so it can be started with a heavy load applied. Synchronous operation is possible. By the way, since the two-stator induction synchronous motor of the present invention has the torque characteristics of both an induction motor and a synchronous motor,
Either motor torque characteristic can be used. This means that even if the motor loses synchronization for some reason while operating at synchronous speed, it is possible to switch from the synchronous motor torque characteristic to the induction motor torque characteristic, so the motor will not suddenly stop like a general synchronous motor. There is no. As described above, since there are no brushes and no complicated configuration is required, maintenance and inspection are easy, and it has become possible to provide a synchronous motor with a large starting torque and a large synchronous torque.

[Brief explanation of drawings]

FIG. 1 is a simplified configuration diagram of the stator winding side and rotor winding side showing an embodiment of the present invention, FIG. 2 is a diagram showing an example of the torque characteristics of the synchronous motor of the present invention, and FIG. 3 is a diagram showing an example of the torque characteristics of the synchronous motor of the present invention. A simple configuration diagram of the stator winding side showing the second embodiment of the present invention, Fig. 4 is a diagram showing the slip with respect to the synchronous speed of the four poles, and Fig. 5 shows the third embodiment of the present invention. FIG. 3 is a simple configuration diagram of the stator winding side. 20... Stator side, 21... Stator winding, 22...
・Stator winding, 23.24... Winding, 25.26...
- Winding, 40... Rotor side, 41.42... First rotor winding, 43.44... Second rotor winding, 45
... Rectifier circuit, 46... Diode, 51.52゜53... Rectifier bridge, 61, 62.63... Transformer, R, S, T... 3-phase AC power supply.

Claims (4)

[Claims] (1) A first rotor winding having an arbitrary number of poles on each of two rotor cores provided at an arbitrary interval on the same rotating shaft; a rotor having a second rotor winding having an integral multiple of the number of poles, each winding being connected between the two rotor cores; Two stator windings each having a number of poles equal to the number of poles of the first rotor winding and connected in parallel are provided on each of the two stator cores disposed around the first rotor winding. , a stator in which a DC excitation voltage is input between the intermediate points of each of the two windings per stator, and the second rotor at a connecting portion between the first and second rotor windings. a rectifier circuit connected to rectify the output voltage of the winding and input it to the first rotor winding; and rotation occurring around a rotor core facing a particular stator of the two stators; 1. A two-stator induction synchronous motor comprising: a voltage phase shift device that creates a phase difference between a magnetic field and a rotating magnetic field generated around a rotor core opposed by another stator. (2) A first rotor winding having an arbitrary number of poles on each of two rotor cores provided at an arbitrary interval on the same rotating shaft; a rotor having a second rotor winding having an integral multiple of the number of poles, each winding being connected between the two rotor cores; Two stator windings each having a number of poles equal to the number of poles of the first rotor winding and connected in parallel are provided on each of the two stator cores disposed around the first rotor winding. , a stator in which an alternating current voltage is input between the intermediate points of each of the two windings per unit, and the second rotor winding at a connecting portion between the first and second rotor windings. a rectifier circuit connected to rectify the line output voltage and input it to the first rotor winding; and a rotating magnetic field generated around a rotor core facing a particular stator of the two stators. 1. A two-stator induction synchronous motor, comprising: a voltage phase shifter for creating a phase difference between the rotor core and a rotating magnetic field generated around a rotor core opposed to the other stator; (3) A first rotor winding having an arbitrary number of poles in each of two rotor cores provided at an arbitrary interval on the same rotating shaft, and the number of poles of the first rotor winding. A rotor having a second rotor winding having a number of poles that is an integral multiple of , and having each winding connected between the two rotor cores; Two stator windings each having a number of poles equal to the number of poles of the first rotor winding and connected in parallel are provided on each of the two stator cores disposed around the first rotor winding. , a stator in which an alternating current voltage having a phase rotation opposite to a phase rotation of the voltage input to the stator winding is input between the intermediate points of each of the two windings per one coil; A rectifier circuit connected to a connecting portion between the first and second rotor windings so as to rectify the output voltage of the second rotor winding and input it to the first rotor winding; and the two fixed rotor windings. Voltage that creates a phase difference between the rotating magnetic field generated around the rotor core facing a specific stator among the stators and the rotating magnetic field generated around the rotor core facing other stators. A two-stator induction synchronous motor characterized by comprising a phase shifter. (4) The two-stator induction synchronous motor according to any one of claims (1) to (3), wherein the voltage phase shifter switches the terminals of one stator winding to opposite polarity by a switch. A two-stator induction synchronous motor characterized by: