JPH01148087A - Brake for multi-stator induction motor - Google Patents

Abstract

PURPOSE:To alter torque characteristic by providing a voltage phase shifter with respect to at least one of a plurality of stators. CONSTITUTION:Terminals U1, V1, W1 and X1, Y1, Z1 are respectively provided at windings 22, 23 of first and second stators 24, 25, the terminals U1, V1, W1 of the winding 23 of the second stator 25 are respectively connected through switches S1, S10 for forming a rotary magnetic field normal/reverse switching unit 26 to commercial 3-phase power sources U, V, W, and a plurality of phase shifting switches are provided at the connecting strokes 48 for connecting the windings 23, 24 in series and the connecting strokes 49 for connecting the winding 22 and the commercial power sources U, V, W, thereby constructing a voltage phase shifter 50. Phase shifting switches S2-S9 for composing the shifter 50 are suitably operated to set efficient starting phase difference, control phase difference and operating phase difference.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a braking device for a multi-stator induction motor with improved starting performance or starting performance and torque characteristics.

[Prior art and its problems]

Conventionally, when starting a squirrel cage induction motor used in a membrane, star-delta starting and reactor starting are used as means to suppress the starting current.

Although starting compensators and the like are known, each of these means has the disadvantage that although it is possible to suppress the starting current, it is not possible to increase the starting torque. In addition, in wire-wound motors, although it is possible to increase the starting torque by changing the resistance value of the secondary resistor, or to create a variable speed induction motor with improved torque characteristics, the control device is expensive and the brushless However, it was necessary to use a slip ring in combination, which caused problems in maintainability.

In addition, techniques to deal with the above problems include, for example, Japanese Patent Application Laid-open No. 5
It is disclosed in Japanese Patent No. 4-29005. This thing is
Two sets of rotor cores installed coaxially, two sets of stators each having independent stator windings facing the rotor cores, and common to the two sets of rotor cores. A squirrel-cage conductor is installed in the center and short-circuited at both ends via short-circuit rings, and a high-voltage conductor is short-circuited between the squirrel-cage conductors at the center of the squirrel-cage conductors between the two sets of rotor cores. This is a twin iron squirrel cage electric motor that is equipped with a resistor, shifts the phase of the stator windings by 180 degrees at startup, and supplies power while matching the phase during operation after startup. By shifting the phase between the windings by 180 degrees, the starting torque is increased and the starting characteristics are improved, and during operation, the phase between the stator windings is matched, allowing operation with normal torque characteristics. However, since it did not have a braking device, its range of use was limited.

[Purpose of the invention]

The present invention is intended to improve the drawbacks of the above-mentioned prior art,
This invention attempts to improve the performance of a multi-stator induction motor by adding a braking device to a multi-stator induction motor with improved starting torque or a multi-stator induction motor with improved starting torque and torque at intermediate speeds.

Note that the object of the present invention also includes a case where the plural stator induction motor is used mainly as a brake.

Note that the multiple stator induction motor of the present invention is a single-phase or three-phase induction motor.
It is used by connecting a phase power source, etc., and the rotor type is a normal squirrel cage type.1. Double cage shape, deep groove cage shape.

It can be applied to any type of conductor such as a special squirrel cage single winding type2), and the conductor used in the explanation of the present invention is:
A general term for the conductors installed on the squirrel cage rotor core and the windings wound on the wound rotor core.2)
, connect the plurality of stators to a power supply in parallel, or connect the plurality of stators in series; It is possible to arbitrarily select and adopt windings that form multiple types of pole numbers on the child as well.

[Means for solving problems]

In order to achieve the above-mentioned technical problem, the present invention connects each of a plurality of conductors installed in each of a plurality of rotor cores that are attached to the same rotating shaft at arbitrary intervals between the rotor cores. the plurality of conductors are connected across the rotor cores to form an integral rotor, the plurality of conductors are connected by a resistive material between the rotor cores, and a plurality of stators are arranged facing the plurality of rotor cores. A voltage phase shifting device is installed in parallel with the frame and associated with at least one stator among the plurality of stators, and a rotating magnetic field forward/reverse switching device is attached to the winding wound around the stator. Connected and used as a means of problem solving.

[For production]

According to the present invention, a phase difference is created between the voltage induced in the rotor conductor portion facing the stator provided with the voltage phase shift device and the voltage induced in the rotor conductor portion facing the other stators, that is, , the torque characteristics can be changed by controlling the voltage induced in the rotor conductors.

In addition, since the plurality of conductors are connected between the plurality of rotor cores by a resistive material that conducts current when a given voltage is applied, current flows between the conductors through the resistive material at startup or at intermediate speeds. It can generate powerful rotational torque.

When stopped, when the direction of the rotating magnetic field is switched by the rotating magnetic field forward/reverse switching device, torque in the opposite direction acts and brakes the rotating electric motor, but at this time,
By causing a phase shift in the voltages induced in the rotor conductor portions facing each of the plurality of stators by the voltage phase shifting device, 2) current is caused to flow between the conductors via the resistive material. Therefore, it is possible to suppress the flow of an excessive current and also obtain a large braking torque.

This remarkable effect cannot be obtained without the voltage phase shifter and the resistance material 2), and according to the present invention, a large braking torque can be applied to the load during operation to bring it to a stop.

〔Example〕

Embodiments of the present invention will be described based on FIGS. 1 to 14.

An embodiment of the present invention according to FIGS. 1 to 3? explain. Reference numeral 1 denotes a multi-stator induction motor 2) according to the present invention, and the multi-stator induction motor 1 has the following configuration.

Rotor cores 2.3 made of a magnetic material are mounted on the rotor shaft 4 at arbitrary intervals, and a non-magnetic core 5 is interposed between the rotor cores 2.3 or a space is provided between the rotor cores 2.3. Rotor core 2
．． Each of the plurality of conductors 6 installed in the rotor core 2.3 is connected to form an integral rotor 7, and the plurality of conductors 6... installed in the rotor core 2.3 are connected in series. Both ends of . are short-circuited by a short-circuit ring 8.8. In addition, rotor core 2
, 3 and the non-magnetic core 5 on both sides 10.1 of the rotor 7.
1, and a plurality of ventilation holes 13 are formed perpendicularly through the outer periphery of the rotor 7 from the ventilation cylinders 12. . The conductor 6 installed in the rotor 7 is connected to the non-magnetic core 5 between the rotor cores 2 and 3 through a resistive material 9 that conducts electricity when a current with an arbitrary vector difference flows through each of them. , i.e. nichrome wire, carbon-containing steel.

They are connected via a resistive material 9 made of electrically conductive ceramic or the like. Bearing discs 15 provided on both sides of the cylindrical machine frame 14.
16 is integrally assembled to the connecting rod 17 by tightening the nuts 18.

A bearing 2 in which cooling impellers 19.20 are mounted on both sides of the rotor 7, and both ends of the rotor shaft 4 are fitted in bearing discs 15.16.
1.21, and the rotor 7 is rotatable.

A first stator 24 and a second stator 25, each having a winding 22.23 on the outer side facing the rotor core 2.3, are arranged side by side on the machine frame 14, and the machine frame 14 and the first stator 24 are connected to each other. between sliding bearing 2
7 is installed e, the sliding bearing 27 is fixed by a stop ring fitted to the machine frame 14, and the second stator 25 is fixed by a stop ring fitted to the machine frame 14.
8 to fix it to the machine frame 14. A gear 29 is fitted onto the outer peripheral surface of one side of the first stator 24 .

A driving gear 31 is pivotally attached to a small motor 30 fixed to the outer periphery of the machine frame 14, and the driving gear 31 is connected to the first stator 24.
It is engaged with the gear 29 fitted into the. With this configuration, 2) the first stator 24 rotates concentrically with the rotor 7 by the operation of the small motor 30, thereby forming a rotating stator. Thus, the rotation of the first stator 24 and the second stator 25 constitute a voltage phase shifting device.

A ventilation port 34 and a ventilation port 35 are bored on the outer periphery of the machine frame 14,
An exhaust fan 36 having a motor 37 is fixed to the exhaust port 35 to circulate air in the space 38 to the outside of the machine frame 14. Also, cooling impellers 19 and 20 that rotate integrally with the rotor shaft 4
Air is taken in from the ventilation hole 32 and the side 'to, ii,
The ventilation 1li12 is provided to allow air to flow through the vent 13. 33 is a vent for air circulation, which is located in the machine frame 1.
It is perforated in the portion facing the first stator 24 and the second stator 25 of No. 4.

Next, the configuration of the means for detecting the rotational position of the first stator 24 will be explained with reference to FIG.

A magnetic body 39 is fixed on the outer periphery of the rotating first stator 24,
A rotational position detector 4 consisting of a plurality of magnetic sensors 408 to 406, etc. is installed at any part of the machine frame 14 facing the magnetic body 39.
o... are provided and communicate with a control device 42 provided with a rotational position indicator 41 that displays the rotational position of the first stator 24.

Reference numeral 43 denotes an inlenoid for unlocking or locking the rotation of the first stator 24, and the rotation release and locking of the stator can be performed by any known operating mechanism. Another embodiment of the rotation mechanism and rotation position detection device will be described with reference to FIG.

A bearing 44 fixed to the machine frame 14 is rotatably provided with a rotating shaft 45 provided with a worm gear 46 that rotates integrally with the rotating shaft 45, and one end of the rotating shaft has a rotating shaft that rotates in forward and reverse directions. A pulse motor 47 for movement is provided concentrically with the rotating shaft 45, and the pulse motor 47 is fixed to the machine frame 14. Reference numeral 51 designates a voltage phase difference setting device 2), which has a phase difference setting knob 52A at starting, a phase difference setting knob 52B during braking, and a phase difference setting knob 53 during operation. The phase difference between the voltages induced in each conductor 6 at the time of starting is set according to the load characteristics, and after a certain period of time or after the rotor 7 reaches a desired rotation speed, the operating phase difference setting knob 53 is set. The configuration is configured to switch to the phase difference set in . Further, when the electric motor is stopped, the rotation is stopped by braking with the phase difference set by the braking phase difference setting knob 52B.

Next, the connection of the windings 22 and 23 wound around each of the first stator 24 and the second stator 25 will be explained based on FIG. 4.5. What is shown in FIG. The windings 22 and 23 provided on each of the second stators 24 and 25 are connected in a series star connection, and are connected to a power source via a rotating magnetic field forward/reverse switching device 26. That is, the winding 2 of the first stator 24
The terminals A, B, and C of 2 are connected to the commercial three-phase power supply A, B, and C through the switch M1, and to the three-phase power supply A through the switch M2.
, C, B, and terminals a, b of volume 1122,
c is connected to the terminals A, B, and C of the winding 23 of the second stator 25, and the terminals a, b, and c of the winding 23 are short-circuited and connected. The one shown in FIG. A switch M3. which connects the windings 22.23 of the second stator 24.25 in series to constitute a rotating magnetic field forward/reverse switching device 26 for a commercial three-phase power supply. Although this is a delta connection via M4, a detailed explanation thereof will be omitted. In addition, 6A and 6B in FIG. 5 show the connections of the wire-wound rotor wound around the rotor core 2.3, and the one shown in FIG. 6 shows the wire-wound rotor wire wound around the rotor core 2.3. FIG.

The operation of the above configuration will be explained below.

When the windings 22 of the first stator 24 are energized from a commercial three-phase power source, a rotating magnetic field is generated in the stator 24, 25, a voltage is induced in the rotor 7, and a current is generated in the conductors 6 of the rotor 7. The flow causes the rotor 7 to rotate.

When the amount of rotation of the first stator 24 with respect to the second stator 25 is set to zero, each stator 24.25
, there is no phase shift in the voltage induced in the conductor 6 of the rotor 7, and as will be detailed later, no current flows through the resistive material 9, so in this state, it is the same as a general induction motor. It has torque characteristics.

Next, a case will be described in which the small motor 30 is operated to rotate the first stator 24 by a phase angle of θ. The magnetic flux φ1 of the rotating magnetic field created by the first stator 24 and the second stator 25.
The phase of φ2 is shifted by θ with respect to any conductor 6 of the rotor 72), so that the first stator 24 and the second stator 2
Voltage d1 induced in conductor 6 of rotor 7 by 5
, the phase of white will be shifted by θ. Now, with the direction of the voltage induced in the conductors 6 of the rotor 7 by the second stator 25 as a reference, the voltage is set to 62=3E. Here, S is the slip 2) and E is the induced voltage when the slip is 1. At this time, the voltage direction induced in the conductors 6 by the first stator 24 is 6r=SEεnoe.

What is shown in FIG. 7 is the relationship between the slip S of the rotor 7 and the active power P input to the rotor when the resistive material 9 that short-circuits the plurality of conductors 6 is not installed. , and the phase of the voltage is θ=o.

When , the effective power P is maximum2), 0°〈θ〈180
When it is °, it is smaller than that.

Here, if the resistance and inductance of the conductor 6 are R and L, and the angular frequency of the power source is ω, then the effective power P
The maximum value of appears when 5=(R/ωL).

Since the active power P is proportional to the driving torque of the induction motor,
By rotating the first stator 24, the voltage induced in the rotor 7 can be adjusted and the speed of the rotor can be increased to vI'm, but as the phase difference increases, the torque decreases rapidly, making it impractical. It is not provided.

Next, when the conductors 6 are connected by the resistance material 9, the respective resistances from the short circuit ring 8 to the resistance material 9 of the conductor 6 of the rotor 7 are R1, R2, and the inductance is Ll, L.
2, the angular frequency of the power source is ω, and the resistance of the resistive material 9 that short-circuits each conductor 6 is r, then the electrical equivalent circuit of the rotor 7 is as shown in FIG. ), code II
.

I2 and 13 indicate the current flowing through each branch.

Next, when converting the circuit shown in Fig. 8 into an equivalent circuit seen from both stators 24 and 25 side, it becomes as shown in Fig. 92), R1=
When R2, Ll=L2 and θ=0°, 13=Il-1
2=O, and no current flows through the resistor material r. This means that when θ=θ°, the torque T is equal to the value without r. Therefore, θ=0°
When , it will have the same torque characteristics as a conventional induction motor.

Next, when RI=R2, LI=L2 and θ=180'', rt=-12, 13=II-12-21+ and 2
), in a conventional induction motor, if the resistance of the rotor conductor 6 is R1+R2=R, the result is the same as if R were increased to R+2''.

Next, the effect of connecting the windings 22 and 23 wound around the I11 stator 24 and the second stator 25 in series will be explained.

Since the windings 22 and 23 are connected in series, the windings 22 and 23 are connected in series.
A current flows between spring 122 and 23 when input from a commercial 3-phase power source, but if there is a difference in the resistance of each winding 22 and 23 or a difference in the capacitance of both stators 24 and 25, Also, independently of that, each winding 22.2
The magnitude of the current flowing through the rotor 7 is equal, and therefore the magnitude of the current induced and flowing from each of the first stator 24 and the second stator 25 to the conductor 6 of the rotor 7 is equal. Both stator 2
4.25 to the conductors 6 of the rotor 7 to be equal in magnitude, and the vector difference caused by the phase difference in voltage between both stators 24.25. Due to the synergistic effect of the current flowing through each of the plurality of conductors 6 through the resistive material 9, which creates a forcing force 2), the slip and torque characteristics shown in Fig. 10 are obtained. As a result, it is possible to improve efficiency and generate large torque in each speed range, and even when a load is connected, it is easy to start in each speed range, and it adapts to the start characteristics of the load and provides smooth control. It can be used as desired, such as starting or starting with high output, and can be optimally used for power sources that frequently repeat starting and stopping.

As described above, the speed of the rotor 7 is controlled by rotating the first stator 24 to control the phase difference between the conductors 6 and 6 of the rotor 7.
The rotational speed of the rotor 7 can be changed arbitrarily only by increasing or decreasing the current flowing through the rotor 7.

Note that the first stator 24 has windings 22 and 23 connected in series.
and the second stator 25 to the conductor 6 of the rotor 7, respectively.
・For the magnitude of the current flowing through the multiple conductors 6...
The ratio of the short-circuited current that flows through the resistive material 9 between them is determined by the value of Pθ (P = number of pole pairs, θ = phase angle), regardless of the resistance value r of the resistive material 9 and slippage. (The above ratio is the maximum when Pθ = π and becomes zero when Pθ = 0.) If Pθ is constant, the ratio is the same as when the secondary insertion resistance of a general wire-wound conductive motor is constant. Due to the slip and torque characteristics 2), when Pθ becomes small, the conductor 6 of the rotor 7...
2), reducing Pθ has the same effect as reducing the secondary insertion resistance of a general wire-wound conductive motor. When the rated current is passed through the inner stators 24 and 25, even if the phase difference θ is arbitrarily changed, it depends on the selection of the slip value and the design of the resistance value of the connecting member 92). The rated torque characteristics can be applied almost simultaneously in each shift range. Also, 1st. Second stator 2
Even if 4.25 windings 22 and 23 are connected in series,
If a resistive material 9 is provided between the conductors 6 and there is no short circuit, almost no voltage will be induced from the stator to the rotor conductors 62), and the inner stator 24°25 This phenomenon results in lower efficiency and torque than when the windings 22 and 23 are connected in parallel to the power supply.

In contrast to the above, the windings 2 of the first stator 24 and the second stator 25
2.23 are connected in parallel to a commercial three-phase lightning source, the windings 22.23 of the first stator 24 and the second stator 25.
23, the voltages induced from each of the inner stators 24 and 25 to the conductors 6 of the rotor 7 are the same, and the phases of the voltages differ by Pθ 2). A current 1 flows through the resistive material 9 between...
The current is approximately proportional to (1/2)X (differential voltage induced in the rotor conductor from each of the first and second stators)÷(resistance value of the resistance material 9...). However, in addition to the current flowing through the resistive material 9, the conductor 6 of the rotor 7 has (the sum of the voltages induced in the rotor conductors of the first and second stators) ÷ (the impedance of the rotor conductor). ) flows in a superimposed manner. (The above sum voltage is maximum when Pθ=π is zero and Pθ=02).The impedance of the rotor conductor is composed of the resistance of the conductor and the secondary leakage reactance, respectively, and therefore varies depending on the slippage.) Therefore, the rotor The ratio of the current flowing between the plurality of conductors 6 through the resistive material 9 to the magnitude of the current flowing through the conductors 6 of No. 7 varies depending on the slip and resistance value even if Pθ is constant. 2) The slip and torque characteristics when Pθ is constant are the same as those when the secondary insertion resistance of a general wire-wound conductive motor is constant, and when the primary voltage of a general induction motor is controlled. The characteristics shown in FIG. 11 are obtained by mixing the characteristics of . This characteristic is the first. Winding 22 of second stator 24.25
．． Compared to the characteristics when 23 are connected in series, the speed control range becomes narrower in the case of certain load characteristics, but in the case of a load with reduced torque characteristics, the speed control range is almost the same as in the case of series connection. It can be used in a wide range of areas.

2) Due to the rotation of the rotor 7, the cooling impeller 19°20 opens the machine frame 1 from the ventilation holes 32 bored in the bearing discs 15 and 16.
The outside air is sucked into the cooling impeller 19.20.
．． The second stator 24゜25, winding 1!22.23 are ventilated to cool them, and the ventilation holes 13, 11, 12...
The rotor cores 2, 3, conductor 6,
. . , resistance material 9 . . . etc. are cooled to stably perform their respective functions. Also, 1st. Second stator 24.25
The rotation is performed by rotating the small motor 30 in forward and reverse directions using a switch, but it is not limited to the small motor 30, and may be any other forward/reverse motor, or any drive device such as a servo mechanism using a gas or liquid cylinder, etc. can be repurposed. Then, in relation to the operating speed of the drive device that rotates the stator, the stator can be rotated at an arbitrary rotational speed, and the rate of change in the rotational speed of the rotor 7 can be controlled.

The drive device shown in Fig. 3 is a pulse motor 47 and a gear 2.
The rotation amount and rotation speed can be controlled by the number of pulses sent from the control device 42 to the pulse motor 47 and the pulse interval. In this embodiment, the worm gear also has the function of fixing rotation.

Referring to FIG. 12, an explanation will be given of the operation when the rotor, which is in a steady state of operation, is brought to a stop via the braking device. Figure 12 is a graph showing the slip and torque when used as a so-called electric motor with a slip S of 0 to 1, and when used as a so-called brake with a slip S of 1 to 22). ", 30', 60@,
90°.

It shows a curve that changes proportionally when the angle is 120°.

Braking is performed by operating the switch of the rotating magnetic field forward/reverse switching device 26 and switching the phases of the three-phase power supply input to the stator windings 22 and 23. That is, the connections of two of the three phases are switched to apply a rotating magnetic field that rotates in the opposite direction. The electric motor currently rotating with an output torque T1 and a slip Sl is controlled with a voltage phase difference of 90° between a plurality of stators.

When the rotating magnetic field forward/reverse switching device 26 is operated to apply a reverse rotating magnetic field, the slip becomes 1+5I=822), and a braking torque of T2 is applied.In addition, providing a phase difference is a secondary function of a wound induction motor. Similar to adjusting the insertion resistance, slip and torque change proportionally, but at the same time, the current also changes proportionally, so by braking with a phase difference, a large braking torque can be obtained with a small current value. The time for applying the reverse rotating magnetic field is a short time until the electric motor stops. 2) The rotation speed detector 54 provided on the rotor of the electric motor and the rotating magnetic field forward/reverse switching device 26 are connected via the control device 42. It can be controlled by a stop signal from the rotation speed detector 54.

Figure 13 shows another embodiment of the voltage phase shifter2)
, a voltage phase shifter is formed by connecting a phase changeover switch to a winding wound around an arbitrary stator without rotating a plurality of stators.

1st. Winding 2 applied to each of the second stators 24, 25
2. Each of 23 has a terminal U+.

V+, Wl and Xl, Y+, Z+ are provided, and the terminals U+, V+, W1 of the winding 23 of the second stator 25 are connected to the switch S1. A connection stroke path 48 connects the winding 22 and the winding 1123 in series, and connects the winding 22 and the winding 1123 to the commercial three-phase power supplies U, V, and W via Sm, respectively.
A voltage phase shifter 50 is constructed by interposing a plurality of phase changeover switches between the power supply voltage 2 and the connection path 49 between the power source 2 and the commercial three-phase power source.

That is, t3, volume 123 (7) terminals X+, Y+, Z+, volume 81
122 (7) is connected to terminals U+, V+, and W+ via a phase changeover switch S2, and similarly connected to terminals X+, V+, and W+ of winding 23.
Y+, Z+ are connected to the terminal Y+ of the winding 22 via the switch S3.
, Z+, X+, terminals W+, U+, V1 of the winding 22 through the switch S4, and the winding 11iA through the switch S5.
22 terminals X+, Y+, and Z+. In addition, the terminals X+, Y+, and Z+ of the winding 22 are connected to the phase changeover switch S6.
It is connected to the three-phase power supplies V, W, and U through the three-phase power supply W through the phase changeover switch S8.

Connect to U and V. Terminals U+, V+ of winding 22.

Wl is connected to the three-phase power supply U, V, through the phase changeover switch S7.
W, and also connected to three-phase power supplies V, W, and U via a phase changeover switch S9.

The operation of the above embodiment will be explained below with reference to FIG.

First, turn on the switch S1 on the winding 23 side, and then turn on the phase changeover switch S2. When S6 is turned on and the others are opened, the winding 23 and the winding 22 are energized via the phase changeover switch S2 provided in the connection stroke path 48, and the current is transferred to the commercial three-phase through the phase changeover switch S6. Flows into the power supply, winding 23.22
The phases of the voltages input to each of them are in the same phase 2), resulting in the maximum rotation speed. Next, with the switch S1 left on, the phase changeover switch S3. When S7 is turned on and the other switches are opened, the phases of the voltages input to each of the windings 23 and 22 are shifted by 60''2), resulting in a lower rotational speed than when the respective phases are in the same phase.

Next, with the switch S+ left on, the phase changeover switch S4. When S8 is turned on and the other switches are opened, the phases of the windings 23 and 22 are shifted by 120 degrees, and the rotation speed becomes even lower than when the phase shift is 60''.Furthermore, when the rotation speed is set to the minimum, , when switch S1 is left on, phase changeover switches Ss and Ss are turned on, and the other switches are opened, the phase of the voltage input to each of the windings 22 and 23 is shifted by 180", and rotation occurs according to the phase shift. It becomes speed.

As described above, by appropriately operating the phase changeover switches 82 to S9 constituting the voltage phase shifter 50, 2) the phase shift can be adjusted to 0°, 60°, and 120°.

It can be set to 180 degrees, and efficient starting phase difference, control phase difference, and operation phase difference can be set and control can be performed.

The feature of this embodiment in which the voltage phase shifter 50 is a phase changeover switch is that although it is not possible to steplessly control the setting of the phase difference during starting and braking and the phase difference during operation, the phase difference can be quickly set in multiple stages by switching the phase. It is possible to switch from the phase difference during starting to the phase difference during operation, and also to quickly switch to the phase difference during braking in multiple stages. In addition to the above-mentioned embodiments, the voltage phase shifting device of the present invention may include a single-phase transformer, a connection changeover switch, and an induced voltage adjustment device, which are described in detail in Japanese Patent Application No. 128314/1983, which was invented by the present applicant. There are utensils etc.

Next, referring to the block diagram shown in FIG. 14 (2), one embodiment of automatic start-up and operation control of the multi-stator induction motor 1 will be described.

Input/output circuit 56. Control circuit 57. On the input side of the control device 42 consisting of an arithmetic circuit 58, a memory circuit 59, etc., there is a voltage phase difference setting device 51° consisting of a starting phase difference setting knob 52A, a braking phase difference setting knob 52B, and an operation phase difference setting knob 53. A speed detector 54 such as a tacho generator equipped with a speed indicator 55 attached to the rotor shaft 4, and the first stator 2
A rotational position detector 40 that detects the rotational position of frame 1
A rotating magnetic field forward/reverse switching device 26 is connected to the output side of the control device 42 by connecting a temperature detector 60 mounted at an appropriate place within the control device 42, a rotation speed setting device 61, and a keyboard 62 equipped with a display.
, small motor 30. Conductor 6. Connect the motor 37 and solenoid 43 of the exhaust air 8136 that cools and radiates heat from the resistive material 9, etc. 2), the voltage phase difference setter 51, the rotation speed setter 61, or the keyboard 62 to the memory circuit 59 of the control device 42. The following control values are input. That is, the phase difference value at startup, the phase difference value at braking, the phase difference value at operation, the rotation speed setting value, and the rotation angle (electrical angle) of the first stator 24 corresponding to the phase angle 0° to 180°. 0° to 180°) and the temperature sensor 6.
This is done by inputting a reference temperature setting value, etc., which controls the motor 37 to increase or decrease with respect to the temperature detected by the sensor.

When the operation preparation key is input from the keyboard 62 at the start of operation, the rotation position detector 40 detects the current rotation position of the first stator 24, and the voltage phase difference setting device 5 detects the current rotation position of the first stator 24.
The solenoid receives a signal from the memory circuit 59 of the control device 42 to output an arbitrary starting phase difference value that is set by the starting phase difference setting knob 52A of No. 1 and that matches the starting characteristics of the load connected to the rotor shaft 4. 43 and the first stator 2
4 is unlocked, the small motor 30 is operated to rotate the first stator 24, and when the desired starting rotation position is reached, the small motor 30 automatically stops.

Then, the multi-stator induction motor 1 starts rotating.

After an arbitrary period of time has elapsed after starting rotation, or after the rotation speed of the rotor 7 reaches the set rotation speed, the operating phase difference setting knob 53
A signal is sent to shift the phase to the operating phase difference value set by , and the small motor 30 starts rotating.

The acceleration of the speed change of the multi-stator induction motor 1 is related to the rotation speed of the small motor 30, but since the rotation speed is set in advance depending on the type of load connected to the multi-stator induction motor 1, the small size When the rotation speed of the motor 30 is controlled, the speed change of the multi-stator induction electric motor tl11 is arbitrarily adjusted.

Then, to control and stop the electric motor that is in steady operation,
The rotating magnetic field forward/reverse switching device 26 is switched to apply υ1 dynamic torque to the rotor using the phase difference value during braking, the rotor is quickly brought to a stop, and the rotating magnetic field is released at the same time as the rotor is stopped.

In addition, it has a phase difference setter at the time of starting and a phase difference setter at the time of braking, and during operation, it is optional to control by the rotation speed of the rotor or to operate without a phase difference. Furthermore, it is also possible to combine the multi-stator induction motor 1 of the present invention with a conventionally known peak conversion device or star-delta starting device 2), thereby expanding the speed range of starting and operating the motor and increasing the efficiency range. It can be used in

Although the embodiments of the present invention are mainly described in terms of a multi-stator induction motor with a squirrel-cage rotor, the present invention is not limited thereto; a wound rotor may also be used, in which case a fifth stator induction motor may be used.
As shown in FIG. 6, generally, the phases of the windings wound around the rotor cores are short-circuited between the rotor cores.

Further, braking performance may be further enhanced by providing windings each of a plurality of stators with a plurality of types of pole numbers and connecting a pole number changeover switch to the terminals of the windings.

In some cases, a switch is provided that allows the connection of the windings wound around each of the stators to be switched between delta connection and star connection to further improve braking performance.

Furthermore, the windings wound around each of the plurality of stators are connected in series with each other, and the windings wound around each of the plurality of stators are connected in parallel to the power supply. There is also. Note that when the stator windings are connected in series as described above, the torque characteristics as an electric motor or a brake are particularly excellent.

In addition, instead of producing a rotating magnetic field in the same direction in all of the plurality of stators, a rotating magnetic field forward/reverse switching device is appropriately arranged to produce a rotating magnetic field in the opposite direction in any one of the plurality of stators; A braking force may be applied to the rotor or the rotor may be locked by generating a rotating magnetic field in one of the plurality of stators in a direction opposite to that of the other stators. In this case as well, a phase shift is provided between the stator that generates the forward rotating magnetic field and the stator that generates the reverse rotating magnetic field. A phase difference is created between the induced voltage and the voltage induced in the rotor conductor portion facing the stator, which generates a counter-rotating magnetic field, and a current is passed through the resistive material connecting the conductors between the rotor cores. It is common to apply resistance.

〔Effect of the invention〕

As explained above, according to the present invention, a voltage phase shifter is provided in relation to any stator among a plurality of stators, and the voltage induced in the rotor conductor installed in each rotor core is A rotating magnetic field forward/reverse switching device is attached to a multi-stator induction motor connected by a resistive material that causes a phase difference between the conductors and conducts current when an arbitrary voltage is applied between the conductors.2)
, a device that outputs a large torque at startup and then controls the phase difference to enter the operating state, or a device that adjusts the starting torque to start and achieves an operating state where the speed is arbitrarily controlled. Relatedly, when the direction of the rotating magnetic field is switched by providing a phase difference, current flows between the conductors via the resistive material interposed between the conductors, so it is possible to suppress excessive current flow and obtain a large braking torque. can.

[Brief explanation of the drawing]

1 to 14 are illustrations of embodiments of the present invention2),
The figure is a side sectional view of a multi-stator induction motor, Figure 2 is a side sectional view showing the stator rotation mechanism and rotation position detection mechanism, and Figure 3 is a side sectional view showing the rotation mechanism of the stator and the rotation position detection mechanism. Figures 4 and 5 are wiring diagrams of the windings wound around both stators, Figure 6 is a wiring diagram of the rotor windings, and Figure 7 is a diagram of the rotor windings. Diagram showing the relationship between child slip and active power,
Figure 8 is an electrical equivalent circuit diagram of the rotor, Figure 9 is an electrical equivalent circuit diagram seen from the stator side, and Figure 10 is a diagram showing the relationship between speed and torque when stator windings are connected in series. , 11th
The figure shows the relationship between speed and torque when stator windings are connected in parallel to the power supply, and Figure 12 shows the relationship between slip and torque in the range of slip 0 to 2 when stator windings are connected in series. FIG. 13 is a diagram showing the relationship, FIG. 13 is a wiring diagram in which the voltage phase shifter is configured with a phase changeover switch, and FIG. 14 is a block diagram showing the configuration of automatic control. DESCRIPTION OF SYMBOLS 1...Multiple stator induction motor, 2.3...Rotor core, 4...Rotor shaft, 5...Nonmagnetic core, 6...
・Conductor, 6A, 6B... Rotor winding, 7... Rotor, 8... Short circuit ring, 9... Resistance material, 10.11...
Side part, 12... Ventilation trunk, 13... Ventilation port, 14...
・Machine frame, 15.16...bearing board, 17...connecting rod,
18...nut, 19.20...cooling impeller, 21
... bearing, 22.23 ... winding, 24 ... first stator, 25 ... second stator, 26 ... magnetic field forward/reverse switching device, 27 ... sliding bearing, 28 ...Fixed ring, 29
... Gear, 30 ... Small motor, 31 ... Drive gear, 32 ... Ventilation port, 33 ... Ventilation port, 34
...Air outlet, 35...Air exhaust port, 36...Exhaust fan,
37...Motor, 38...Space, 39-1 gas, 40, 40a, 40b. 40C, 40d... Rotation position detector, 41... Rotation position indicator, 42... Control device, 43... Solenoid, 44... Bearing, 45... Rotation shaft, 46 ...Worm gear, 47...Pulse motor-148...
Connecting stroke path, 49... Connecting stroke path, 50... Voltage phase shifter, 51... Voltage phase difference setter, 52A... Phase difference setting knob at starting, 52B... Phase difference at braking Setting knob, 53... Phase difference setting knob during operation, 54...
・Speed detector, 55... Speed indicator, 56... Input/output circuit, 57... Control circuit, 58... Arithmetic circuit, 5
9... Memory circuit, 60... Temperature detector, 61...
Rotation speed setting device, 62...keyboard.

Claims (7)

[Claims] (1) Integral rotation by connecting multiple conductors installed in each of multiple rotor cores attached to the same rotating shaft at arbitrary intervals across the rotor cores. the plurality of conductors are connected by a resistive material between the rotor cores, a plurality of stators are arranged in parallel on the machine frame facing the plurality of rotor cores, and the plurality of stators A plurality of stators, characterized in that a voltage phase shifting device is attached to at least one stator among the stators, and a rotating magnetic field forward/reverse switching device is connected to a winding wound around the stator. Braking device for induction motor. (2) A braking device for a multi-stator induction motor according to claim (1), wherein a space or a non-magnetic material is provided between the rotor cores. (3) The voltage phase shifting device is formed into a rotary stator by forming at least one stator among the plurality of stators so as to be rotatable concentrically with the rotor. No. (1)
A braking device for a multi-stator induction motor according to item (2) or item (2). (4) The rotating stator induces a voltage in a corresponding conductor portion of the rotor facing the rotating stator and a voltage induced in a corresponding conductor portion of the rotor facing the other stator. A braking device for a multi-stator induction motor according to claim (3), which is capable of setting and maintaining a phase difference between voltages at an arbitrary value within a range of 0° to 180° in electrical angle. (5) The rotary stator is provided with a rotary position detector directly or indirectly in relation to the rotary stator, as set forth in claim (3) or (4). Braking device for multiple stator induction motors. (6) The multiple stator induction according to any one of claims (1) to (5), wherein the rotating magnetic field forward/reverse switching device and the voltage phase shift device are connected via a control device. Braking device for electric motor. (7) Claims (1) to (6) in which a rotational speed detector is provided directly or indirectly on the rotor, and the rotating magnetic field forward/reverse switching device and the rotational speed detector are connected. A braking device for a multi-stator induction motor according to any one of paragraphs.