JP2016168108A - Motor device and washing machine including motor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve wide N-T characteristics.SOLUTION: A motor includes: a stator which generates a first rotating magnetic field derived from one first AC voltage out of a three-phase AC voltage and a six-phase AC voltage, and a second rotating magnetic field derived from the other second AC voltage out of the three-phase AC voltage and the six-phase AC voltage; a first rotor having a plurality of magnetic substances arranged around a rotational axis of the motor, and supported rotatably inside the stator; and a second rotor having a plurality of magnets arranged around the rotational axis, and supported rotatably inside the first rotor. The second rotating magnetic field selectively rotates the second rotor. The first rotor and the second rotor generate a coupling magnetic field of the order of magnetically coupling with the first rotating magnetic field.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor device and a washing machine including the motor device.

  Conventionally, there has been proposed a motor configured to increase output torque while achieving low noise and low vibration. For example, the motor described in Patent Document 1 includes an outer rotor provided outside the stator and an inner rotor provided inside the stator. The outer rotor and the inner rotor are connected to the same rotating shaft and configured to rotate integrally. With such a configuration, the driving force of the outer rotor and the driving force of the inner rotor are added to increase the output torque.

International Publication No. 2007/123107

  On the other hand, in recent years, motors having a wide range of NT characteristics from low speed high torque to high speed low torque have been demanded as motor NT characteristics representing the relationship between rotational speed and torque. For example, a motor for driving a vehicle such as an electric vehicle or a hybrid vehicle is required to have a low speed and high torque characteristic when the vehicle starts, and a high speed and low torque characteristic as the vehicle speed increases. Further, for example, a direct drive motor of a washing machine requires low speed and high torque characteristics in a washing process or a rinsing process, and high speed and low torque characteristics in a dehydration process. In particular, in the washing step or the rinsing step, it is required to increase the torque of the motor as the amount of laundry increases.

  However, in the motor described in Patent Document 1, a configuration for realizing a wide NT characteristic has not been sufficiently studied.

  An object of this invention is to provide the motor apparatus which implement | achieves a wide NT characteristic, and a washing machine provided with this motor apparatus.

  One aspect of the present invention includes a motor and an output unit that outputs a superimposed AC voltage in which a three-phase AC voltage and a six-phase AC voltage are superimposed, and the motor includes the three-phase AC voltage and the six-phase AC voltage. A stator that generates a first rotating magnetic field derived from one first AC voltage among the voltages and a second rotating magnetic field derived from the other second AC voltage among the three-phase AC voltage and the six-phase AC voltage. A first rotor that is rotatably supported inside the stator, and a plurality of magnets that are disposed around the rotation axis. A second rotor rotatably supported inside the first rotor, wherein the second rotating magnetic field selectively rotates the second rotor, and the first rotor and the second rotor are The order of magnetic coupling with the first rotating magnetic field. It is intended to generate a magnetic field.

  In this aspect, the first rotating magnetic field derived from one of the three-phase alternating voltage and the six-phase alternating voltage and the second alternating voltage of the other of the three-phase alternating voltage and the six-phase alternating voltage are derived. A second rotating magnetic field is generated in the stator. The second rotating magnetic field selectively rotates the second rotor. For this reason, only the second rotor is rotated by the second rotating magnetic field. The first rotor and the second rotor generate an order coupling magnetic field that is magnetically coupled to the first rotating magnetic field. For this reason, when the frequency of the first rotating magnetic field, that is, the frequency of the first AC voltage changes, the rotational speed of the coupling magnetic field changes. As a result, the ratio of the rotation speed of the second rotor to the rotation speed of the first rotor, that is, the magnetic gear ratio changes.

  Therefore, according to this aspect, by changing the frequency of the first AC voltage, the first rotor can be rotated at a rotational speed of an arbitrary magnetic gear ratio with respect to the rotational speed of the second rotor. . As a result, it is possible to realize a wide range of NT characteristics from low speed high torque to high speed low torque.

  In the above aspect, the stator includes a coil portion to which the superimposed alternating voltage is applied, and a slot having a number Ns (Ns is a multiple of 6) formed around the rotation axis and accommodating the coil portion. May be. The first rotor may include the plurality of magnetic bodies having a pole number Np (Np is an integer of 2 or more). The second rotor may include the plurality of magnets having a pole pair number Nm (Nm is a positive integer). The number of pole pairs Nm and the number of poles Np may be set to values at which the coupling magnetic field is generated under the number of slots Ns. The number of pole pairs Nm may be set to a value that causes the second rotating magnetic field to selectively rotate the second rotor under the number of slots Ns.

  In this aspect, the number of pole pairs Nm and the number of poles Np are set to values at which a coupling magnetic field is generated under the number of slots Ns. The number of pole pairs Nm is set to a value at which the second rotating magnetic field selectively rotates the second rotor under the number of slots Ns. For this reason, according to this aspect, it is possible to realize a wide range of NT characteristics from low speed high torque to high speed low torque.

  In the above aspect, the first AC voltage may be the six-phase AC voltage. The second AC voltage may be the three-phase AC voltage.

  In general, a three-phase AC voltage has a higher utilization factor of magnetic flux contributing to the rotation of the motor than a six-phase AC voltage. In this aspect, the second rotor is rotated by the second rotating magnetic field generated by the three-phase AC voltage. Therefore, according to this aspect, the output of the motor can be easily increased.

  In the above aspect, Ns / 6 = Np ± Nm. Ns / 3 = Nm may be satisfied.

  According to this aspect, since Ns / 6 = Np ± Nm, the first rotating magnetic field generated by the six-phase AC voltage and the combined magnetic field of the order generated by the first rotor and the second rotor are preferably It will be magnetically coupled. Further, since Ns / 3 = Nm, the second rotor can be selectively rotated by the second rotating magnetic field generated by the three-phase AC voltage.

  In the above aspect, the plurality of magnetic bodies are arranged at equal intervals around the rotation axis in the first rotor, and the first magnetic body and a second magnetic body adjacent to the first magnetic body are provided. May be included. The first magnetic body includes a first side surface defined by a surface extending radially from the rotation axis, and a second side surface defined by a surface extending radially from the rotation axis and opposite to the first side surface. You may have. The second magnetic body may have a third side surface that is defined by a surface extending radially from the rotation axis and that faces the second side surface. A central angle formed by the first side surface, the rotating shaft, and the second side surface may be equal to a central angle formed by the second side surface, the rotating shaft, and the third side surface.

  In this aspect, the central angle formed by the first side surface, the rotation shaft, and the second side surface is equal to the central angle formed by the second side surface, the rotation shaft, and the third side surface. For this reason, according to this aspect, the magnetic flux distribution passing through the magnetic body is equally spaced around the rotation axis. Therefore, the coupled magnetic field of the order generated by the first rotor and the second rotor can be made point-symmetric. As a result, the first rotor can be smoothly rotated.

  In the above aspect, the coil units include a first phase coil unit, a second phase coil unit, a third phase coil unit, a fourth phase coil unit, a fifth phase coil unit, And a phase coil portion. The output unit includes, as the superimposed AC voltage, three-phase AC voltages Vu, Vv, Vw whose phases are sequentially shifted by 120 degrees, and six-phase AC voltages Va, Vb, Vc whose phases are sequentially shifted by 60 degrees. A voltage on which Vd, Ve, and Vf are superimposed may be output. A voltage in which the three-phase AC voltage Vu and the six-phase AC voltage Va are superimposed may be applied to the first phase coil unit. A voltage obtained by superimposing the three-phase AC voltage Vv and the six-phase AC voltage Vb may be applied to the second-phase coil unit. A voltage obtained by superimposing the three-phase AC voltage Vw and the six-phase AC voltage Vc may be applied to the third-phase coil unit. A voltage obtained by superimposing the three-phase AC voltage Vu and the six-phase AC voltage Vd may be applied to the fourth phase coil unit. A voltage obtained by superimposing the three-phase AC voltage Vv and the six-phase AC voltage Ve may be applied to the fifth phase coil portion. A voltage in which the three-phase AC voltage Vw and the six-phase AC voltage Vf are superimposed may be applied to the sixth phase coil unit.

  In the above aspect, the output unit includes a first-phase switching element to a sixth-phase switching element connected to the first-phase coil unit to the sixth-phase coil unit, respectively, and connected in parallel to a DC power source. A six-phase inverter, and an inverter control unit that performs PWM control on the first-phase switching element to the sixth-phase switching element to generate the superimposed AC voltage.

  In this aspect, the first-phase switching element to the sixth-phase switching element of the six-phase inverter are PWM-controlled by the inverter control unit, and the superimposed AC voltage in which the three-phase AC voltage and the six-phase AC voltage are superimposed is generated. The first-phase switching element to the sixth-phase switching element of the six-phase inverter are connected to the first-phase coil section to the sixth-phase coil section, respectively, and connected to the DC power supply in parallel. Therefore, according to this aspect, the superimposed alternating voltage can be suitably applied to the first phase coil portion to the sixth phase coil portion.

  The said aspect WHEREIN: You may further provide the transmission shaft which is arrange | positioned in the position which corresponds with the said rotating shaft, is connected to the said 1st rotor, and transmits rotation of the said 1st rotor to the exterior.

  In this aspect, the rotation of the first rotor is transmitted to the outside by the transmission shaft. Therefore, according to this aspect, the rotation of the first rotor rotating at a rotation speed of an arbitrary magnetic gear ratio can be transmitted to the outside with respect to the rotation speed of the second rotor.

  Another aspect of the present invention includes the motor device according to the above aspect and a rotating drum in which clothing is accommodated, the transmission shaft is connected to the rotating drum, and the output unit is a washing step for washing the clothing. And a washing control unit for performing a rinsing step for rinsing the garment and a dehydrating step for dehydrating the garment, and changing the frequency of the first AC voltage, in the washing step and the rinsing step, And a frequency control unit that controls the rotation speed of the first rotor to a first rotation speed, and the dehydration step controls the rotation speed of the first rotor to a second rotation speed higher than the first rotation speed. .

  In this aspect, the frequency of the first AC voltage is changed by the frequency control unit, the rotation speed of the first rotor is controlled to the first rotation speed in the washing process and the rinsing process, and the rotation of the first rotor is performed in the dehydration process. The speed is controlled to a second rotation speed higher than the first rotation speed. Therefore, according to this aspect, while the transmission shaft is a direct drive system in which the transmission shaft is connected to the rotating drum, the rotating drum is rotated at an appropriate torque and rotating speed in the washing process, the rinsing process, and the dehydrating process, respectively. be able to.

  The said aspect WHEREIN: The said washing control part may determine the quantity of the said clothing accommodated in the said rotating drum. The frequency control unit may adjust a rotation speed of the first rotor according to the determined amount of the clothing.

  In this aspect, the amount of clothes accommodated in the rotating drum is determined, and the rotation speed of the first rotor is adjusted according to the determined amount of clothes. Therefore, according to this aspect, the rotating drum can be rotated at a rotation speed appropriate for the amount of clothing.

  According to the present invention, it is possible to realize a wide range of NT characteristics from low speed high torque to high speed low torque.

It is a figure showing roughly the composition of the motor of a 1st embodiment. It is a figure which shows schematically the structure of the drive part which drives the motor shown by FIG. It is a figure explaining operation | movement as a motor of a magnetic CVT motor. It is a figure explaining operation | movement as magnetic CVT of a magnetic CVT motor. It is a figure explaining operation | movement as magnetic CVT of a magnetic CVT motor. It is a figure which shows roughly the magnetic flux density distribution of the magnetic CVT motor in the magnetically stable initial position. It is a figure which shows the induced voltage of a coil. It is a figure which shows roughly the result of having calculated | required operation | movement of PP rotor when a PM rotor is forcedly rotated and a 6-phase alternating current is supplied to a coil. It is a figure which shows roughly the result of having calculated | required by operation | movement of PM rotor and PP rotor when rotating a PM rotor by vector control. It is a figure which shows roughly the result of having calculated | required by analysis the operation | movement of PP rotor when a PM rotor is forcedly rotated. It is a figure which shows the connection state of the coil at the time of performing the analysis of FIG. It is a figure which shows another connection state of the coil at the time of performing the analysis of FIG. It is a figure which shows roughly the analysis result of the no-load rotational speed of PM rotor and PP rotor calculated | required by changing the frequency of 6-phase alternating voltage. It is a figure which shows the rotational speed ratio (gear ratio) of PM rotor and PP rotor calculated | required from the analysis result of FIG. 12, and theoretical gear ratio. It is a block diagram which shows roughly the control structure used in order to obtain the analysis result of FIG. It is a block diagram which shows roughly the structure of the washing machine of 2nd Embodiment. It is a schematic perspective view of a washing machine. It is a schematic sectional drawing of a washing machine. It is a flowchart which shows roughly operation | movement of a washing machine.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals are used for the same components.

(First embodiment)
(Constitution)
FIG. 1 is a diagram schematically showing the configuration of the motor of the first embodiment. FIG. 2 is a diagram schematically showing a configuration of a drive unit that drives the motor shown in FIG. The motor of the first embodiment is a magnetic CVT motor in which a magnetic continuously variable transmission mechanism (magnetic CVT) that transmits power without contact and a permanent magnet synchronous motor are integrated.

  As shown in FIG. 1, the magnetic CVT motor 1 according to the first embodiment is referred to as a stator 10 and a pole piece rotor (hereinafter referred to as “PP rotor”) facing the inner peripheral surface of the stator 10. 20), a permanent magnet rotor (hereinafter referred to as "PM rotor") 30 facing the inner peripheral surface of the PP rotor 20, and a transmission shaft P0. The transmission shaft P <b> 0 is disposed at a position that coincides with the rotation axis of the magnetic CVT motor 1.

  The stator 10 is formed in a cylindrical shape centered on the rotating shaft (transmission shaft P0) of the magnetic CVT motor 1. A plurality of slots 11 are formed on the inner peripheral surface of the stator 10 to accommodate the coil portions. In the first embodiment, the slot number Ns is Ns = 18 as shown in FIG.

  In the slot 11, coils A1 to F1, A2 to F2, and A3 to F3 wound in a concentrated winding manner are accommodated in the counterclockwise order in FIG. As shown in FIG. 2, coils A1 to A3, coils B1 to B3, coils C1 to C3, coils D1 to D3, coils E1 to E3, and coils F1 to F3 are connected in series. Hereinafter, the coils A1 to A3 are collectively referred to as a coil A, the coils B1 to B3 are collectively referred to as a coil B, the coils C1 to C3 are collectively referred to as a coil C, the coils D1 to D3 are collectively referred to as a coil D, and the coils E1 to E1 E3 is generically referred to as coil E, and coils F1 to F3 are generically referred to as coil F.

  As shown in FIG. 2, coil A (an example of a first phase coil part), coil B (an example of a second phase coil part), coil C (an example of a third phase coil part), coil D ( An example of the fourth phase coil part), a coil E (an example of the fifth phase coil part), and a coil F (an example of the sixth phase coil part) are connected to each other in a star shape to form a six-phase coil. doing. Note that the connection method of the coils A to F is not limited to a star shape, and may be another connection method.

  As shown in FIG. 1, a PP rotor 20 (an example of a first rotor) is disposed across a predetermined gap so as to face the inner peripheral surface of the stator 10. The PP rotor 20 is formed in a cylindrical shape with the rotation axis (transmission shaft P0) of the magnetic CVT motor 1 as the center. The PP rotor 20 is supported by the stator 10 so as to be rotatable around the rotation axis of the magnetic CVT motor 1. The PP rotor 20 is connected to the transmission shaft P0. With this configuration, the rotation of the PP rotor 20 is transmitted to the outside via the transmission shaft P0.

  The PP rotor 20 has a plurality of magnetic bodies 21. The plurality of magnetic bodies 21 are arranged at substantially equal intervals around the rotation axis (transmission shaft P0) of the magnetic CVT motor 1. As shown in FIG. 1, the number of poles Np of the magnetic body 21 of the PP rotor 20 is Np = 9. That is, in the first embodiment, the PP rotor 20 has nine magnetic bodies 21.

  A plurality of magnetic bodies 21 are used by using one magnetic body 21a (an example of a first magnetic body) and a magnetic body 21b (an example of a second magnetic body) disposed adjacent to the magnetic body 21a. The arrangement of the magnetic body 21 will be described.

  The magnetic body 21a has a side surface 22 (an example of a first side surface) and a side surface 23 opposite to the side surface 22 (an example of a second side surface). The side surface 22 is included in a surface 22a extending radially from the rotation axis (transmission shaft P0) of the magnetic CVT motor 1, and the side surface 23 is included in a surface 23a extending radially from the rotation axis (transmission shaft P0) of the magnetic CVT motor 1. It is. The magnetic body 21 b has a side surface 24 (an example of a third side surface) that faces the side surface 23. The side surface 24 is included in a surface 24a that extends radially from the rotation shaft (transmission shaft P0) of the magnetic CVT motor 1. The center angle θ1 formed by the surface 22a (side surface 22), the transmission shaft P0, and the surface 23a (side surface 23), and the center formed by the surface 23a (side surface 23), the transmission shaft P0, and the surface 24a (side surface 24). The angle θ2 has a substantially equal value. That is, the gap between the magnetic body 21 and the magnetic body 21 and the magnetic body 21 are substantially the same in shape and size.

  A PM rotor 30 (an example of a second rotor) is disposed across a predetermined gap so as to face the inner peripheral surface of the PP rotor 20. The PM rotor 30 is formed in a columnar shape with the rotation axis (transmission shaft P0) of the magnetic CVT motor 1 as the center. The PM rotor 30 is supported with respect to the stator 10 so as to be rotatable around the rotation axis (transmission shaft P0) of the magnetic CVT motor 1. The PM rotor 30 has permanent magnets 31 arranged in the circumferential direction in the vicinity of the outer peripheral surface.

  As shown in FIG. 1, the number of pole pairs Nm of the PM rotor 30 is Nm = 6. In other words, the PM rotor 30 has 12 poles. In the structure shown in FIG. 1, the PM rotor 30 is a surface-attached permanent magnet, but may be an embedded permanent magnet.

  As shown in FIG. 2, the drive unit 40 includes a DC power supply 41, a six-phase inverter 42, and a motor control unit 43. The DC power supply 41 includes a battery, for example, and outputs a predetermined DC voltage between the positive line Lp and the negative line Ln.

  The six-phase inverter 42 includes switching elements Qau and Qal, switching elements Qbu and Qbl, switching elements Qcu and Qcl, switching elements Qdu and Qdl connected between the positive line Lp and the negative line Ln, respectively. Switching elements Qeu, Qel and switching elements Qfu, Qfl are provided. In this embodiment, for example, a metal oxide semiconductor field effect transistor (MOSFET) is used as each switching element. Each switching element is not limited to a MOSFET, and, for example, an insulated gate bipolar transistor (IGBT) may be used.

  A connection point K1 between the switching element Qau and the switching element Qal is connected to the coil A. A connection point K2 between the switching element Qbu and the switching element Qbl is connected to the coil B. A connection point K3 between the switching element Qcu and the switching element Qcl is connected to the coil C.

  A connection point K4 between the switching element Qdu and the switching element Qdl is connected to the coil D. A connection point K5 between the switching element Qeu and the switching element Qel is connected to the coil E. A connection point K6 between the switching element Qfu and the switching element Qfl is connected to the coil F.

  The motor control unit 43 (an example of an inverter control unit) performs PWM control of each switching element of the six-phase inverter 42, and the three-phase AC voltage and the six-phase AC voltage are superimposed on the coils A to F from the six-phase inverter 42. The superimposed AC voltage is applied.

  Specifically, the six-phase inverter 42 applies a superimposed alternating voltage (Vu + Va) in which the three-phase alternating voltage Vu and the six-phase alternating voltage Va are superimposed on the coil A. The six-phase inverter 42 applies a superimposed alternating voltage (Vv + Vb) in which the three-phase alternating voltage Vv and the six-phase alternating voltage Vb are superimposed on the coil B. The six-phase inverter 42 applies a superimposed alternating voltage (Vw + Vc) in which the three-phase alternating voltage Vw and the six-phase alternating voltage Vc are superimposed on the coil C.

  The six-phase inverter 42 applies a superimposed alternating voltage (Vu + Vd) in which the three-phase alternating voltage Vu and the six-phase alternating voltage Vd are superimposed on the coil D. The six-phase inverter 42 applies a superimposed alternating voltage (Vv + Ve) in which the three-phase alternating voltage Vv and the six-phase alternating voltage Ve are superimposed on the coil E. The six-phase inverter 42 applies a superimposed alternating voltage (Vw + Vf) in which the three-phase alternating voltage Vw and the six-phase alternating voltage Vf are superimposed on the coil F.

  The three-phase AC voltages Vu, Vv, and Vw are sinusoidal voltages whose phases are sequentially shifted by 120 degrees. The six-phase AC voltages Va, Vb, Vc, Vd, Ve, and Vf are sine wave voltages whose phases are sequentially shifted by 60 degrees. In the present embodiment, the drive unit 40 is included in an example of the output unit.

(Operating principle)
Here, the operation principle of the magnetic CVT motor 1 will be described. In the magnetic CVT motor 1 of the first embodiment, a three-phase AC voltage for establishing the operation principle as a motor and a six-phase AC voltage for realizing the operation principle as a magnetic CVT are applied to the coils A to F. It operates by being applied simultaneously. Simultaneous application of the 3-phase AC voltage and the 6-phase AC voltage is realized by generating a superimposed AC voltage in which the 3-phase AC voltage and the 6-phase AC voltage are superimposed by the 6-phase inverter 42 as described above. The

  FIG. 3 is a diagram for explaining the operation of the magnetic CVT motor 1 as a motor. In FIG. 3, only one third of the magnetic CVT motor 1 is schematically shown. The operation principle of the magnetic CVT motor 1 as a motor will be described with reference to FIGS.

  As shown in FIG. 2, the six-phase inverter 42 applies the same three-phase AC voltage Vu as the U phase to the coils A and D, and the same three-phase AC as the V phase to the coils B and E. A voltage Vv is applied, and the same three-phase AC voltage Vw is applied to the coils C and F as the W phase.

  Then, the relationship between the stator 10 and the PM rotor 30 is the same as that of a normal 12-pole 18-slot motor. For this reason, the PM rotor 30 rotates as indicated by arrows in FIG. 3 by applying the three-phase AC voltages Vu, Vv, and Vw to the coils A to F. Thus, the magnetic flux generated by applying the three-phase AC voltages Vu, Vv, and Vw to the coils A to F generates torque for rotating the PM rotor 30 as a motor.

  On the other hand, the rotating magnetic field generated by the three-phase AC voltage does not match the number of poles Np of the PP rotor 20 (Np = 9 in the first embodiment). For this reason, the three-phase AC voltage applied to the coils A to F does not directly rotate the PP rotor 20.

  4 and 5 are diagrams for explaining the operation of the magnetic CVT motor 1 as a magnetic CVT. 4 and 5, only 1/3 of the magnetic CVT motor 1 is schematically shown. The operation principle of the magnetic CVT motor 1 as a magnetic CVT will be described with reference to FIGS.

Consider the magnetic flux generated in the air gap between the stator 10 and the PP rotor 20. If it is assumed that the magnetomotive force F (θ, α) of the permanent magnet 31 of the PM rotor 30 is distributed in a sine wave shape, the magnetomotive force F (θ, α) is expressed by Expression (1).
F (θ, α) = A · sin {Nm (θ−α)} (1)
Here, A is the amplitude of the magnetomotive force, Nm is the number of pole pairs of the PM rotor 30, and α is the rotation angle of the PM rotor 30.

Next, the permeance distribution P (θ, β) of the air gap between the stator 10 and the PP rotor 20 when the influence of the PP rotor 20 is taken into consideration is expressed by Expression (2).
P (θ, β) = Pv + Pp · sin {Np (θ−β)} (2)
Here, Pv is an average value of permeance, Pa is an amplitude of permeance, Np is the number of poles of the PP rotor 20, and β is a rotation angle of the PP rotor 20.

  The magnetic flux φ (θ, α, β) generated in the gap between the stator 10 and the PP rotor 20 is the product of the formula (1) and the formula (2), and is represented by the formula (3).

φ (θ, α, β)
= F (θ, α) ・ P (θ, β)
= A · Pv · sin {Nm (θ-α)}
+ A · Pa · cos [(Np−Nm) {θ− (Np · β−Nm · α) / (Np−Nm)}]
−A · Pa · cos [(Np + Nm) {θ− (Np · β + Nm · α) / (Np + Nm)}]
... (3)
The second term and the third term of Equation (3) are harmonic magnetic fluxes generated in the gap between the stator 10 and the PP rotor 20.

  The order of this harmonic is represented by (Np ± Nm). In the first embodiment, as described above, the number of poles Np of the PP rotor 20 is 9, and the number of pole pairs Nm of the PM rotor 30 is 6. Therefore, in the gap between the stator 10 and the PP rotor 20, specifically, third-order and fifteenth-order harmonic magnetic fluxes are generated. FIG. 4 schematically shows a third-order harmonic magnetic flux Mh3.

  The rotation angle of the harmonic magnetic flux Mh3 is determined by the relative positional relationship between the magnet 31 of the PM rotor 30 and the magnetic body 21 of the PP rotor 20, that is, the rotation angle of the PM rotor 30 and the rotation angle of the PP rotor 20. . In other words, when the rotation angle of the harmonic magnetic flux Mh3 changes, the rotation angle ratio between the PM rotor 30 and the PP rotor 20 also changes.

Let us consider a case where the rotation angle of the third-order harmonic magnetic flux shown in the second term of equation (3) is constant at 0 as represented by equation (4).
(Np · β−Nm · α) / (Np−Nm) = 0 (4)
In this case, the rotation angle ratio Grb between the PM rotor 30 and the PP rotor 20 is expressed by Expression (5).
Grb = α / β = Np / Nm (5)
Expression (5) means that the output of the PM rotor 30 that rotates as a motor is decelerated by the gear ratio Grb and output from the PP rotor 20. Hereinafter, the gear ratio Grb when the rotational speed of the harmonic shown in the equation (5) is 0 is referred to as a basic gear ratio.

  As shown in FIG. 2, the 6-phase inverter 42 applies a 6-phase AC voltage Va to the coil A, applies a 6-phase AC voltage Vb to the coil B, applies a 6-phase AC voltage Vc to the coil C, A 6-phase AC voltage Vd is applied to the coil D, a 6-phase AC voltage Ve is applied to the coil E, and a 6-phase AC voltage Vf is applied to the coil F.

  As described above, when the six-phase AC voltages Va to Vf are respectively applied to the coils A to F of the stator 10, a tertiary rotating magnetic field Mr3 is generated as shown in FIG. The third-order rotating magnetic field Mr3 and the third-order harmonic magnetic flux Mh3 are magnetically coupled. For this reason, the rotational speed of the third-order harmonic magnetic flux can be controlled by the frequency of the six-phase AC voltage.

Assuming that the rotation angle of the third-order harmonic magnetic flux is γ as expressed by Expression (6), the rotation angle ratio Grd between the PM rotor 30 and the PP rotor 20 is expressed by Expression (7).
(Np · β−Nm · α) / (Np−Nm) = γ (6)
Grd = α / β = α · Grb / {α + (Grb−1) · γ} (7)
From the equation (7), by controlling the frequency of the six-phase AC voltage according to the rotational speed of the PM rotor 30, an arbitrary rotational angle ratio between the PM rotor 30 and the PP rotor 20, that is, the PM rotor 30 and the PP rotor 20. It can be seen that an arbitrary gear ratio can be obtained.

  The magnetic flux generated by the application of the six-phase AC voltages Va to Vf to the coils A to F coupled to the third-order harmonic magnetic flux Mh3 generated by the PP rotor 20 and the PM rotor 30 directly causes the PP rotor 20 to pass through. The torque for rotating is not generated, but the torque for operating the PP rotor 20 as a speed reducer for the PM rotor 30 is generated.

(Restrictions)
A constraint condition for establishing the operation principle of the magnetic CVT motor 1 will be described. In the first embodiment, a three-phase AC voltage and a six-phase AC voltage are applied to the coils A to F of the stator 10. For this reason, the number of slots Ns of the stator 10 needs to be a multiple of six.

  Further, in the magnetic CVT motor 1 of the first embodiment, generated by a rotating magnetic field (an example of a first rotating magnetic field) generated by a six-phase AC voltage, a magnet 31 of the PM rotor 30 and a magnetic body 21 of the PP rotor 20. It is necessary to magnetically couple the magnetic flux of the order to be generated.

Therefore, the number of slots Ns, the number of poles Np of the PP rotor 20, and the number of pole pairs Nm of the PM rotor 30 need to satisfy the constraint shown in Expression (8).
Ns / 6 = Np ± Nm (8)
Since the number of slots Ns is a multiple of 6, the left side Ns / 6 in equation (8) is an integer.

  In the magnetic CVT motor 1 of the first embodiment, the rotating magnetic field generated by the three-phase AC voltage (an example of the second rotating magnetic field) and the magnetic flux generated by the magnet 31 of the PM rotor 30 are magnetically generated. Need to join. As a result, the rotating magnetic field generated by the three-phase AC voltage rotates the PM rotor 30.

Therefore, the number of slots Ns and the number of pole pairs Nm of the PM rotor 30 need to satisfy the constraint shown in Expression (9).
Ns / 3 = Nm (9)
Since the number of slots Ns is a multiple of 6, the left side Ns / 3 of Equation (9) is an integer.

(Verification of operation principle)
The result of verifying the validity of the operating principle of the magnetic CVT motor 1 described above by two-dimensional finite element analysis will be described.

(A. Verification of induced voltage)
FIG. 6 is a diagram schematically showing the magnetic flux density distribution of the magnetic CVT motor 1 at the magnetically stable initial position. FIG. 7 shows a state in which the PM rotor 30 is forcibly rotated synchronously from the initial position shown in FIG. 6 at 60 r / min and the PP rotor 20 at a basic gear ratio of 1.5 at 40 r / min. It is a figure which shows the induced voltage of coils AF. The vertical axis in FIG. 7 represents the induced voltage, and the horizontal axis represents the rotation angle of the PM rotor 30.

  As shown in FIG. 7, for example, a phenomenon in which the waveform of the induced voltage is different in a coil having the same phase as the three-phase motor, such as the coil A and the coil D, was confirmed. For example, as shown in FIG. 1, this phenomenon is caused when the coil A <b> 1 faces the magnetic body 21 of the PP rotor 20 and the coil D <b> 1 is a gap between the magnetic body 21 and the magnetic body 21 of the PP rotor 20. This is caused by the fact that they are facing each other.

When formulas (8) and (9), which are constraints on the magnetic CVT motor 1, are arranged, formula (10) is obtained as a relational formula between the number of slots Ns and the number of poles Np of the PP rotor 20.
Np = Ns / 2, Ns / 6 (10)
From the equation (10), it can be seen that in the magnetic CVT motor 1 of the first embodiment, due to constraints, a difference occurs in the induced voltage of the coils that are in phase as a three-phase motor.

(B. Verification as magnetic CVT)
FIG. 8 schematically shows the results obtained by analyzing the operation of the PP rotor 20 when the PM rotor 30 is forcibly rotated at 30 r / min and a six-phase alternating current having an amplitude of 50 A and a frequency of 1.5 Hz is supplied to the coil. FIG. The vertical axis in FIG. 8 represents the rotation angle of the PM rotor 30 and the PP rotor 20, and the horizontal axis represents time.

  FIG. 8 shows a rotation angle change L130 of the PM rotor 30, a rotation angle change L120 of the PP rotor 20, and a theoretical rotation angle change Lp of the PP rotor 20. The inclination of the rotation angle change shown in FIG. 8 corresponds to the rotation speed.

  The theoretical rotational speed Lp of the PP rotor 20 obtained from the equation (7) is 10 r / min as shown in FIG. As shown in FIG. 8, it can be confirmed that the inclination of the rotation angle change L120 of the PP rotor 20 obtained by the analysis roughly matches the theoretical value although the speed fluctuation is large. From this, it can be understood that the operation principle as the above-mentioned magnetic CVT can be said to be appropriate.

  The reason why the speed fluctuation is large is that, as shown in the equation (10), the number of slots Ns of the stator 10 is an integral multiple of the number of poles Np of the PP rotor 20, and therefore the torque ripple becomes large. It is believed that there is.

(C. Verification as a motor)
FIG. 9 is a diagram schematically showing results obtained by analyzing the operations of the PM rotor 30 and the PP rotor 20 when the PM rotor 30 is rotated by vector control. The vertical axis in FIG. 9 represents the rotation speed, and the horizontal axis represents time. In the analysis of FIG. 9, the power supply voltage is 12 V, and the target value of the d-axis current is 0.

  FIG. 9 shows the rotational speed L230 of the PM rotor 30 and the rotational speed L220 of the PP rotor 20.

  According to the above operating principle, when the 6-phase AC voltage is not applied, the magnetic CVT does not hold, so only the PM rotor 30 rotates and the PP rotor 20 should not rotate. However, in the analysis result of FIG. 9, the PP rotor 20 rotates at a basic gear ratio of 1.5 with respect to the PM rotor 30.

  In order to clarify the cause, the operation of the PP rotor 20 was analyzed when the PM rotor 30 was forcibly rotated without giving an electrical input.

  FIG. 10 is a diagram schematically showing a result obtained by analyzing the operation of the PP rotor 20 when the PM rotor 30 is forcibly rotated. The vertical axis in FIG. 10 represents the rotation speed, and the horizontal axis represents time. 11A and 11B are diagrams showing the connection states of the coils A to F when the analysis of FIG. 10 is performed.

  In the first embodiment, as shown in FIG. 11A, an open state in which all the coils A to F are made independent from each other, and as shown in FIG. The analysis of FIG. 10 is performed in the connection state in which the coil D) is connected.

  FIG. 10 shows the rotational speed L330 of the PM rotor 30, the rotational speed L320 of the PP rotor 20 in the open state shown in FIG. 11A, and the rotational speed L321 of the PP rotor 20 in the connected state shown in FIG. 11B. It is represented.

  As shown in FIG. 10, when the coils A to F are in an open state (FIG. 11A), the PP rotor 20 is not rotating. This is because, as described above, the principle of magnetic CVT is not established when a six-phase AC voltage is not applied to the coils A to F.

  On the other hand, in a connection state (FIG. 11B) in which coils having the same phase in a three-phase alternating current are connected, the PP rotor 20 rotates at a basic gear ratio of 1.5 with respect to the PM rotor 30 as in FIG. . Therefore, even if the same voltage is applied to the coils of the same phase, a difference occurs in the induced voltage as described with reference to FIG. 7, so that a current flows and a magnetic field is generated. As a result, a six-phase AC voltage is generated. It is considered that a phenomenon similar to the phenomenon caused by the rotating magnetic field generated by is generated.

  From the above, the PM rotor 30 of the magnetic CVT motor 1 of the first embodiment rotates on the same principle as that of a normal motor. Even when a six-phase AC voltage is not applied, the principle of a magnetic gear that transmits power by a magnetic force is established by a current generated from a difference between induced voltages, and the PP rotor 20 rotates.

(D. Verification as a magnetic CVT motor)
FIG. 12 is a diagram schematically showing an analysis result of the no-load rotational speeds of the PM rotor 30 and the PP rotor 20 obtained by changing the frequency of the six-phase AC voltage. The vertical axis in FIG. 12 represents the no-load rotational speed, and the horizontal axis represents the frequency of the rotating magnetic field of the six-phase AC voltage. FIG. 13 is a diagram showing a rotational speed ratio (gear ratio) between the PM rotor 30 and the PP rotor 20 obtained from the analysis result of FIG. 12 and a theoretical gear ratio. The vertical axis in FIG. 12 represents the gear ratio, and the horizontal axis represents the frequency of the rotating magnetic field of the six-phase AC voltage. FIG. 14 is a block diagram schematically showing a control configuration used to obtain the analysis result of FIG.

  In the analysis of FIG. 12, the motor drive voltage (that is, the three-phase AC voltages Vu, Vv, Vw) is set to 12V, and the magnetic CVT voltage (that is, the six-phase AC voltages Va to Vf) is set to 12V. Is 24V.

  In FIG. 14, the motor unit 50 generates three-phase AC voltages Vu, Vv, and Vw, and controls the rotation of the PM rotor 30 of the magnetic CVT motor 1. The magnetic CVT unit 60 generates six-phase AC voltages Va to Vf and controls the gear ratio of the PP rotor 20 to the PM rotor 30 of the magnetic CVT motor 1.

  The motor unit 50 includes a target Id generation unit 51, a target Iq generation unit 52, a proportional integration (PI) control unit 53, an inverse dq conversion unit 54, a dq conversion unit 55, and a detection unit 56. The target Id generator 51 generates a target value Itd for the d-axis current Id. The target Id generation unit 51 outputs the generated target value Itd to the PI control unit 53. The target Iq generator 52 generates a target value Itq for the q-axis current Iq. The target Iq generation unit 52 outputs the generated target value Itq to the PI control unit 53. The target Id generation unit 51 and the target Iq generation unit 52 may hold in advance predetermined target values Itd and Itq, respectively.

  The d-axis and the q-axis constitute a synchronous rotation coordinate (d, q). The d-axis represents the axial direction of the permanent magnet of the rotor in the permanent magnet synchronous motor. The q axis represents a direction orthogonal to the d axis.

  The dq conversion unit 55 performs coordinate conversion to the (d, q) coordinates for the phase currents Ia to If flowing in the coils A to F, and converts the d axis current Id and the q axis current Iq to each other. Ask. The dq converter 55 feeds back the obtained d-axis current Id and q-axis current Iq to the PI controller 53.

  The detection unit 56 includes, for example, an encoder attached to the rotation shaft of the PM rotor 30, and detects the rotation speed Rv of the PM rotor 30 and the rotation angle Ra of the PM rotor 30. The detection unit 56 outputs the detected rotational speed Rv of the PM rotor 30 to the PI control unit 53. The detection unit 56 outputs the detected rotation angle Ra of the PM rotor 30 to the inverse dq conversion unit 54.

  The PI control unit 53 generates a d-axis voltage Vd from the d-axis current Id, the target value Itd, and the rotation speed Rv using PI control. The PI control unit 53 outputs the generated d-axis voltage Vd to the inverse dq conversion unit 54. The PI control unit 53 generates a q-axis voltage Vq from the q-axis current Iq, the target value Itq, and the rotation speed Rv using PI control. The PI control unit 53 outputs the generated q-axis voltage Vq to the inverse dq conversion unit 54.

  The inverse dq converter 54 performs inverse coordinate conversion from the (d, q) coordinates on the d-axis voltage Vd and the q-axis voltage Vq using the rotation angle Ra of the PM rotor 30, and 3 Phase alternating voltages Vu, Vv, and Vw are generated.

  The magnetic CVT unit 60 includes an amplitude generation unit 61, a frequency generation unit 62, and a six-phase AC voltage generation unit 63. The amplitude generator 61 generates the amplitude Ap of the six-phase AC voltages Va to Vf. The amplitude generation unit 61 outputs the generated amplitude Ap to the six-phase AC voltage generation unit 63. The frequency generator 62 generates the frequency Fq of the six-phase AC voltages Va to Vf. The frequency generation unit 62 outputs the generated frequency Fq to the 6-phase AC voltage generation unit 63. The 6-phase AC voltage generator 63 generates the sine wave 6-phase AC voltages Va to Vf using the amplitude Ap and the frequency Fq.

  The three-phase AC voltages Vu, Vv, and Vw generated by the inverse dq converter 54 and the sine wave six-phase AC voltages Va to Vf generated by the six-phase AC voltage generator 63 are superposed and magnetic. Applied to the coils A to F (FIG. 2) of the CVT motor 1.

  FIG. 12 shows the no-load rotation speed L430 of the PM rotor 30 and the no-load rotation speed L420 of the PP rotor 20 when the frequency Fq generated by the frequency generation unit 62 is changed.

  FIG. 13 shows the theoretical gear ratio Gtr calculated from the no-load rotational speed L430 of the PM rotor 30 and the frequency Fq of the six-phase AC voltages Va to Vf. Note that FIG. 13 also shows the rotational speed ratio between the PM rotor 30 and the PP rotor 20 obtained from the analysis result of FIG. 12, but the theoretical gear ratio is equal to the theoretical gear ratio Gtr. It is hidden behind Gtr.

  Thus, since the rotational speed ratio between the PM rotor 30 and the PP rotor 20 and the theoretical gear ratio Gtr agree well, it is shown that the operating principle of the magnetic CVT motor described above is appropriate. I can say.

  In FIGS. 12 and 13, the frequency of the rotating magnetic field of the six-phase AC voltage on the horizontal axis being 0 represents that no six-phase AC voltage is applied. When the frequency of the rotating magnetic field of the six-phase AC voltage is 0, the PP rotor 20 rotates at a basic gear ratio of 1.5 with respect to the PM rotor 30 as shown in FIGS. This is the same as described with reference to FIGS. 9 and 10.

  In addition, the torque of the PP rotor 20 can be changed by changing the amplitude of the six-phase AC voltages Va to Vf or the thickness of the magnetic body 21. That is, when the amplitude of the six-phase AC voltages Va to Vf is increased, the torque of the PP rotor 20 can be increased. Further, when the thickness of the magnetic body 21 of the PP rotor 20 is increased, the torque of the PP rotor 20 can be increased.

(Function and effect)
As described above, in the magnetic CVT motor 1 of the first embodiment, the superimposed AC voltage obtained by superimposing the three-phase AC voltages Vu, Vv, and Vw and the six-phase AC voltages Va to Vf is the coil of the stator 10. Applied to A to F. By applying the three-phase AC voltages Vu, Vv, and Vw among the superimposed AC voltages, the PM rotor 30 can be rotated on the same principle as a normal permanent magnet synchronous motor. Further, the principle of magnetic CVT is established by applying the six-phase AC voltages Va to Vf. As a result, the PP rotor 20 can be rotated at a rotational speed determined by the rotational speed L430 of the PM rotor 30 and the theoretical gear ratio Gtr controlled by the frequency Fq of the six-phase AC voltage.

(Other)
(1) The first embodiment is configured such that the PM rotor 30 is driven by a three-phase AC voltage. Alternatively, the PM rotor 30 may be driven by a six-phase AC voltage. In this case, a configuration may be adopted in which the number of slots Ns remains 18, the number of pole pairs Nm of the permanent magnet 31 of the PM rotor 30 is 3, and the number of poles Np of the magnetic body 21 of the PP rotor 20 is 9.

  In this configuration, the PM rotor 30 is rotationally driven by 6-phase AC voltages Va to Vf as a 6-pole 18-slot motor.

  The order of the harmonic magnetic flux generated in the air gap between the stator 10 and the PP rotor 20 is (Np ± Nm) as described above. For this reason, in this structure, the 6th-order and 12th-order harmonic magnetic fluxes are generated.

  On the other hand, when three-phase AC voltages Vu to Vw and Vu to Vw are respectively applied to the coils A to C and D to F of the stator 10, a sixth-order rotating magnetic field is generated. The sixth-order rotating magnetic field and the sixth-order harmonic magnetic flux are magnetically coupled. As a result, the rotational speed of the PP rotor 20 is controlled by the frequency of the three-phase AC voltage.

  In general, the three-phase AC voltage has a higher utilization rate of the magnetic flux contributing to the rotation of the motor than the six-phase AC voltage. For this reason, the direction of rotating the PM rotor 30 by the rotating magnetic field formed by the three-phase AC voltage can easily increase the output of the motor. Therefore, the first embodiment in which the PM rotor 30 is rotated by a rotating magnetic field formed by a three-phase AC voltage is preferable.

  (2) In the first embodiment, as shown in FIG. 12, the relationship between the rotational speed L420 of the PP rotor 20 and the rotational speed L430 of the PM rotor 30 is L430 ≧ L420. That is, as shown in FIG. 13, the gear ratio Gtr is Gtr ≧ 1, and a reduction gear is configured.

  Alternatively, L430 <L420 can be obtained by further increasing the frequency of the six-phase AC voltage. That is, it is possible to configure a speed increaser in which the gear ratio Gtr is Gtr <1.

  (3) In the first embodiment, as shown in FIG. 1, the number of slots Ns, the number of poles Np of the PP rotor 20, and the number of pole pairs Nm of the PM rotor 30 are Ns = 18, Np = 9, Nm = 6. However, it is not limited to this. It is only necessary that Ns is a multiple of 6 and that the constraints of equations (8) and (9) are satisfied.

(Second Embodiment)
FIG. 15 is a block diagram schematically showing the configuration of the washing machine of the second embodiment. A washing machine 100 according to the second embodiment includes the magnetic CVT motor 1 according to the first embodiment. The washing machine 100 will be described with reference to FIG. In addition, the solid line arrow shown in FIG. 15 represents the flow of water. The dotted arrow shown in FIG. 15 represents the flow of air. A one-dot chain line arrow shown in FIG. 15 represents a transmission path of the control signal.

  The washing machine 100 includes a main housing 200, a control unit 300, a water supply mechanism 400, a washing mechanism 500, a circulation mechanism 600, and a drying mechanism 700. The main housing 200 accommodates the control unit 300, the water supply mechanism 400, the washing mechanism 500, the circulation mechanism 600, and the drying mechanism 700. The control unit 300 (an example of an output unit) includes a washing control unit 310 and the driving unit 40 described in the first embodiment.

  The washing mechanism 500 includes a storage tank 510 in which clothing is stored, a position sensor 520 (described later), and the magnetic CVT motor 1 that drives the storage tank 510. The magnetic CVT motor 1 drives the storage tank 510 under the control of the washing control unit 310 and the motor control unit 43. In the washing process, the storage tank 510 stirs the clothes in a liquid containing a detergent. As a result, the garment is properly washed. When the washing process is completed, the water is drained and the process proceeds to a rinsing process. A dehydration process may be performed between the washing process and the rinsing process.

  In the rinsing process, the storage tank 510 stirs the clothes in water having a lower detergent concentration than in the washing process. Further, in the rinsing process, water supply to the storage tank 510 and drainage from the storage tank 510 are repeated. As a result, the detergent is properly removed from the garment.

  In the dehydration process after the rinsing process, the storage tank 510 dehydrates the clothes using centrifugal force. As a result, drying of clothes is promoted. After the dehydration process is completed, the rinsing process may be performed again before the process proceeds to the drying process. That is, the rinsing process and the dehydrating process may be repeated a plurality of times. In addition, the duration of each dehydration process in the dehydration process performed between the washing process and the rinsing process, the intermediate dehydration process when the rinsing process is repeated a plurality of times, and the final dehydration process after the last rinsing process is completed May be the same value or different values.

  In the drying process, dry air is supplied to the storage tank 510. Since the humidity of the dry air is low and the temperature is high, the clothes are appropriately dried in the storage tank 510. While the dry air is supplied, the storage tank 510 stirs the clothes. As a result, the clothes are appropriately dried.

  The water supply mechanism 400 supplies water to the storage tank 510 in the above-described washing process and rinsing process. The water supply mechanism 400 includes a water supply port 410 connected to the faucet, a switching valve 420, and a detergent storage unit 430 in which a detergent is stored. The water supplied to the water supply port 410 reaches the switching valve 420. The switching valve 420 switches the water supply path between the first water supply path 421 in which the water goes directly to the storage tank 510 and the second water supply path 422 in which water is supplied to the storage tank 510 through the detergent storage unit 430. Switch.

  The first water supply path 421 may be used, for example, in a rinsing process. As a result, tap water is directly supplied to the storage tank 510. The 2nd water supply path 422 may be used for a washing process, for example. When the switching valve 420 opens the second water supply path 422, water flows into the detergent container 430. In the detergent container 430, water and detergent are mixed. As a result, water containing the detergent flows into the storage tank 510.

  The circulation mechanism 600 includes a circulation pump 610. The circulation mechanism 600 may circulate water between the circulation pump 610 and the storage tank 510 in the above-described washing process and rinsing process. In the present embodiment, the circulation mechanism 600 includes a circulation path 620 for circulating water between the circulation pump 610 and the storage tank 510.

  The drying mechanism 700 includes an air filter 710 that receives air sent out from the storage tank 510, a heat exchange unit 720 that exchanges heat with the air that has passed through the air filter 710, and a blower fan that sends out air that has passed through the heat exchange unit 720. 730. The air filter 710 removes lint from the air sent out from the storage tank 510. Accordingly, the purified air flows into the heat exchange unit 720.

  In the drying process, the laundry control unit 310 may activate the heat exchange unit 720. The heat exchange unit 720 dehumidifies and heats the air. As a result, dry air suitable for drying clothes is generated. The washing control unit 310 may stop the heat exchange unit 720 during the washing process and the dehydrating process. As a result, the heat exchange unit 720 does not consume power unnecessarily. Alternatively, the laundry control unit 310 may activate the heat exchange unit 720 in the washing process. As a result, the detergent may be activated using the heat transferred from the heat exchange unit 720 to the air.

  The washing control unit 310 operates the blower fan 730 in the drying process. As a result, the above-described dry air flows from the blower fan 730 through the blower path 740 to the storage tank 510 and dries the clothes. The dry air then flows into the air filter 710 through a return path 741 defined between the storage tank 510 and the air filter 710.

  FIG. 16 is a schematic perspective view of the washing machine 100. The washing machine 100 will be further described with reference to FIGS. 15 and 16.

  The main housing 200 is opposite to the front wall 210, the rear wall 220 opposite to the front wall 210, the left wall 230 erected between the front wall 210 and the rear wall 220, and the left wall 230. And a top wall 250 surrounded by the upper edges of the front wall 210, the rear wall 220, the left wall 230 and the right wall 240, and a bottom wall 260 opposite to the top wall 250. The water supply port 410 described with reference to FIG. 15 is exposed on the top wall 250. The user can connect the water supply port 410 and the faucet (not shown) using, for example, a hose.

  The washing machine 100 further includes a door body 101 attached to the front wall 210. The door body 101 rotates between a closed position along the front wall 210 and an open position protruding from the front wall 210. Note that the door body 101 shown in FIG. 16 is in the open position. When the door body 101 is in the open position, the insertion port 511 defined by the storage tank 510 is exposed. The user can rotate the door body 101 to the open position, and can put the clothes into the storage tank 510 through the input port 511, and can take out the clothes from the storage tank 510.

  FIG. 17 is a schematic cross-sectional view of the washing machine 100. The washing machine 100 will be further described with reference to FIGS. 15 and 17.

  The storage tank 510 includes a rotating drum 530 in which clothing is stored and a water tank 540 in which the rotating drum 530 is stored. The rotary drum 530 includes an inner ring wall 531 that defines the inlet 511, an inner bottom wall 532 opposite to the inner ring wall 531, and a cylindrical inner peripheral wall between the inner ring wall 531 and the inner bottom wall 532. 533. The water tank 540 includes an outer ring wall 541 disposed between the front wall 210 and the inner ring wall 531, an outer bottom wall 542 disposed between the rear wall 220 and the inner bottom wall 532, and the outer ring wall 541. And an outer peripheral wall 543 surrounding the inner peripheral wall 533 between the outer bottom wall 542 and the outer bottom wall 542.

  On the bottom wall 260 of the housing 100, for example, a hollow cylindrical guide rod 550 is erected. For example, a cylindrical support bar 551 is fitted into the guide bar 550. The support bar 551 is supported on the bottom wall 260 inside the guide bar 550 via, for example, a spring (not shown). The upper end of the support bar 551 is in contact with the water tank 540, and the support bar 551 supports the water tank 540. As the amount of clothing put into the storage tub 510 increases, the gravity applied to the spring increases, so the position of the upper end of the support bar 551 decreases.

  The position sensor 520 (see FIG. 15) detects the position of the upper end of the support bar 551. The position sensor 520 outputs the detected position of the upper end of the support bar 551 to the washing control unit 310 of the control unit 300. The washing control unit 310 determines the amount of clothes put in the storage tub 510 based on the position of the upper end of the support bar 551 detected by the position sensor 520.

  The transmission shaft P <b> 0 of the magnetic CVT motor 1 passes through the outer bottom wall 542 and is connected to the inner bottom wall 532. The driving force of the magnetic CVT motor 1 is transmitted to the rotating drum 530 through the transmission shaft P0.

  In addition to the circulation pump 610, the circulation mechanism 600 is connected to the drain valve 690, the upstream circulation pipe 640 that defines the path of water flowing from the water tank 540 to the circulation pump 610, and the outer ring wall 541. A downstream circulation pipe 650 that defines a path of water returning to 540 and a drain pipe 660 that defines a drain path to the outside of the main housing 200 are provided.

  The drain valve 690 is attached to the drain pipe 660. The washing control unit 310 (see FIG. 15) controls the drain valve 690. While water is being circulated between the storage tank 510 and the circulation pump 610, the washing control unit 310 closes the drain valve 690. The washing control unit 310 opens the drain valve 690 in order to discharge unnecessary water.

  The downstream circulation pipe 650 receives the water discharged from the circulation pump 610 and defines the circulation path 612 described with reference to FIG.

  In addition to the air filter 710, the heat exchange unit 720, and the blower fan 730, the drying mechanism 700 includes an intake pipe 750 that defines a flow path of air from the storage tank 510 to the blower fan 730, and air sent from the blower fan 730. An air supply pipe 760 that regulates the flow of the air. The air filter 710 and the heat exchange unit 720 are disposed in the intake pipe 750. The blower fan 730 is disposed at a connection portion between the intake pipe 750 and the air supply pipe 760. When the blower fan 730 rotates, a negative pressure environment is created in the intake pipe 750, while a positive pressure environment is created in the air supply pipe 760.

  The air supply pipe 760 defines the air blowing path 740 described with reference to FIG. The intake pipe 750 defines the return path 741 described with reference to FIG.

  Returning to FIG. 15, in the second embodiment, the DC power source 41 of the drive unit 40 generates a DC 24 V DC power source from an AC 100 V commercial power source, for example.

  The motor control unit 43 (an example of the frequency control unit) of the drive unit 40 has a predetermined first gear ratio in the washing process and the rinsing process as a gear ratio for rotationally driving the magnetic CVT motor 1 (PP rotor 20). The second gear ratio in the dehydration process and the third gear ratio in the drying process are held in advance.

  In the second embodiment, the first gear ratio in the washing process and the rinsing process is determined in advance, for example, at a low speed and a high torque of 3.4. In the second embodiment, the second gear ratio in the dehydration process is determined in advance to, for example, 1 high speed and low torque. In the second embodiment, the third gear ratio in the drying process is set in advance to, for example, 2 medium speed / medium torque.

  The rotational speed of the PP rotor 20 determined by the second gear ratio is set to a higher value than the rotational speed of the PP rotor 20 determined by the first gear ratio. The rotational speed of the PP rotor 20 determined by the first gear ratio is an example of the first rotational speed. The rotational speed of the PP rotor 20 determined by the second gear ratio is an example of the second rotational speed.

  The motor control unit 43 adjusts the first gear ratio, the second gear ratio, and the third gear ratio according to the amount of clothing determined by the washing control unit 310. In the second embodiment, the motor control unit 43 is configured such that, for example, as the amount of clothing increases, the torque increases, that is, the gear ratio increases, so that the first gear ratio, the second gear ratio, Adjust the 3 gear ratio.

  In addition, the washing control part 310 and the motor control part 43 may be comprised by one microcomputer, for example, and may be comprised by a separate microcomputer.

  FIG. 18 is a flowchart schematically showing the operation of the washing machine 100 controlled by the control unit 300. The operation of the washing machine 100 will be described with reference to FIGS. 2 and 15 to 18.

  When the user instructs the start of the washing operation, the operation of FIG. 18 is started. First, in step S110, the laundry control unit 310 acquires the detected position of the upper end of the support bar 551 from the position sensor 520. The washing control unit 310 determines the amount of clothes put in the storage tank 510 based on the acquired position of the upper end of the support bar 551.

  In subsequent step S120, motor control unit 43 of control unit 300 determines the gear ratio in each step in accordance with the amount of clothing determined in step S110. That is, the motor control unit 43 adjusts the first gear ratio in the washing process and the rinsing process, the second gear ratio in the dehydration process, and the third gear ratio in the drying process according to the amount of clothes, Determine the gear ratio.

  In subsequent step S130, the laundry control unit 310 executes a washing process. In the washing process, the washing control unit 310 controls the water supply mechanism 400 and opens the water supply port 410. In addition, the laundry control unit 310 controls the switching valve 420 to open the second water supply path 422 to the detergent storage unit 430. As a result, water flows into the detergent container 430. The detergent in the detergent container 430 dissolves in water. Thereafter, the water containing the detergent flows into the storage tank 510. When a predetermined amount of water is supplied to the storage tank 510 through the detergent storage unit 430, the laundry control unit 310 controls the circulation pump 610 to circulate water between the circulation pump 610 and the storage tank 510. . As a result of the circulation of water between the circulation pump 610 and the storage tank 510, the detergent concentration in the water sent from the water supply mechanism 400 is made uniform. In addition, the laundry control unit 310 outputs an instruction signal for instructing the rotation of the rotary drum 530 to the motor control unit 43.

  Further, the motor control unit 43 controls the magnetic CVT motor 1 in accordance with the instruction signal from the washing control unit 310, and the magnetic CVT motor 1 (PP rotor 20) with the low-speed high-torque gear ratio determined in step S120. Is rotated to rotate the rotating drum 530. As a result, the clothes are agitated in the rotating drum 530. Therefore, the water containing the detergent comes into uniform contact with the entire clothing in the storage tank 510.

  When the predetermined washing end condition is satisfied, the washing control unit 310 ends the washing process, and in the subsequent step S140, the washing control unit 310 executes the rinsing process. When the washing process is completed, the water is drained and the process proceeds to the rinsing process. A dehydration process may be performed between the washing process and the rinsing process.

  In the rinsing process, the washing control unit 310 controls the switching valve 420 to open the first water supply path 421 to the storage tank 510. As a result, the water flows directly into the storage tank 510 without flowing into the detergent container 430. In addition, the laundry control unit 310 outputs an instruction signal for instructing the rotation of the rotary drum 530 to the motor control unit 43.

  In the rinsing process, the motor control unit 43 rotates and drives the magnetic CVT motor 1 (PP rotor 20) at the same gear ratio as that in the washing process (step S130) in response to an instruction signal from the washing control unit 310. The drum 530 is rotated. As a result, the clothes are agitated in the rotating drum 530. Therefore, the water not containing the detergent comes into uniform contact with the entire clothing in the storage tank 510. This properly removes the detergent from the garment.

  When the predetermined rinsing end condition is satisfied, the washing control unit 310 ends the rinsing process, and in the subsequent step S150, the washing control unit 310 executes the dehydration process. In the dehydration process, the washing control unit 310 controls the switching valve 420 to close the first water supply path 421 to the storage tank 510. As a result, water does not flow into the storage tank 510. In addition, the laundry control unit 310 outputs an instruction signal for instructing the rotation of the rotary drum 530 to the motor control unit 43.

  Further, the motor control unit 43 controls the magnetic CVT motor 1 in accordance with the instruction signal from the washing control unit 310, and the magnetic CVT motor 1 (PP rotor 20) with the high speed and low torque gear ratio determined in step S120. Is rotated to rotate the rotating drum 530. As a result, the water contained in the garment is appropriately removed from the garment using centrifugal force, and the drying of the garment is promoted.

  When the predetermined dehydration end condition is satisfied, the laundry control unit 310 ends the dehydration process, and in the subsequent step S160, the laundry control unit 310 executes the drying process. In the drying process, the washing control unit 310 controls the blower fan 730 and the heat exchanger 720 to supply dry air to the storage tank 510. In addition, the laundry control unit 310 outputs an instruction signal for instructing the rotation of the rotary drum 530 to the motor control unit 43.

  Further, the motor control unit 43 controls the magnetic CVT motor 1 in accordance with the instruction signal from the washing control unit 310, and the magnetic CVT motor 1 (PP rotor 20) with the gear ratio of medium to medium torque determined in step S120. ) Is rotated to rotate the rotating drum 530. As a result, the clothes are agitated in the rotating drum 530. Therefore, the dry air comes into uniform contact with the entire clothing in the storage tank 510. This ensures that the garment is properly dried.

  When the predetermined drying end condition is satisfied, the laundry control unit 310 ends the drying process. In addition, the washing control unit 310 outputs an instruction signal that instructs the stop of the rotary drum 530 to the motor control unit 43. The motor control unit 43 stops the rotation of the magnetic CVT motor 1 (PP rotor 20) in response to an instruction signal from the washing control unit 310. As a result, the operation of FIG. 18 ends. In addition, you may perform a rinsing process again after the completion | finish of a spin-drying | dehydration process, before moving to a drying process. That is, the rinsing process and the dehydrating process may be repeated a plurality of times.

  In the second embodiment, the magnetic CVT motor 1 of the first embodiment is used as a motor for rotating the rotary drum 530. Therefore, when rotating the rotating drum 530 in the washing process and the rinsing process, rotating the rotating drum 530 in the dehydration process, and rotating the rotating drum 530 in the drying process, rotate at an appropriate rotation speed and torque, respectively. The drum 530 can be rotated.

(Other)
(1) The washing machine 100 of the second embodiment includes a drying mechanism 700. Alternatively, the washing machine 100 may not include a drying mechanism. 17 shows a washing machine in which the rotation axis of the rotary drum 530 is inclined, the rotation axis of the rotary drum 530 may be horizontal, or the rotary drum 530 may be a so-called vertical washing machine. The rotation axis may be vertical.

  (2) In the said 2nd Embodiment, the washing machine 100 provided with the magnetic CVT motor 1 of 1st Embodiment is illustrated. Alternatively, a train including the magnetic CVT motor 1, an electric vehicle, or a hybrid vehicle may be used. In such a motor for driving a vehicle, a low speed and high torque characteristic is required when the vehicle starts, and a high speed and low torque characteristic is required as the vehicle speed increases. By providing the magnetic CVT motor 1 of the first embodiment, the required characteristics as described above can be realized.

  The motor device of the present disclosure is useful for a device that requires a motor having a wide range of NT characteristics from low speed and high torque to high speed and low torque.

DESCRIPTION OF SYMBOLS 1 Magnetic CVT motor 10 Stator 11 Slot 20 PP rotor 21 Magnetic body 30 PM rotor 31 Permanent magnet 41 DC power supply 42 6 phase inverter 43 Motor control part 100 Washing machine 300 Control part 310 Washing control part 520 Position sensor 530 Rotating drum

Claims (10)

A motor,
An output unit that outputs a superimposed alternating voltage in which a three-phase alternating voltage and a six-phase alternating voltage are superimposed;
With
The motor is
A first rotating magnetic field derived from one first alternating voltage of the three-phase alternating voltage and the six-phase alternating voltage, and a second alternating voltage derived from the other of the three-phase alternating voltage and the six-phase alternating voltage. A stator for generating a second rotating magnetic field;
A first rotor having a plurality of magnetic bodies arranged around a rotation axis of the motor and rotatably supported inside the stator;
A second rotor having a plurality of magnets arranged around the rotation axis and rotatably supported inside the first rotor;
Including
The second rotating magnetic field selectively rotates the second rotor;
The first rotor and the second rotor generate a coupled magnetic field of an order that is magnetically coupled to the first rotating magnetic field;
Motor device. The stator includes a coil portion to which the superimposed alternating voltage is applied, and a slot having a number of slots Ns (Ns is a multiple of 6) formed around the rotating shaft and accommodating the coil portion,
The first rotor has the plurality of magnetic bodies having a pole number Np (Np is an integer of 2 or more),
The second rotor includes the magnets having a pole pair number Nm (Nm is a positive integer),
The number of pole pairs Nm and the number of poles Np are set to values at which the coupling magnetic field is generated under the number of slots Ns.
The pole pair number Nm is set to a value that causes the second rotating magnetic field to selectively rotate the second rotor under the slot number Ns.
The motor device according to claim 1. The first alternating voltage is the six-phase alternating voltage,
The second AC voltage is the three-phase AC voltage.
The motor device according to claim 2. Ns / 6 = Np ± Nm,
Ns / 3 = Nm,
The motor device according to claim 3. The plurality of magnetic bodies include a first magnetic body and a second magnetic body adjacent to the first magnetic body, arranged at equal intervals around the rotation axis in the first rotor,
The first magnetic body includes a first side surface defined by a surface extending radially from the rotation axis, and a second side surface defined by a surface extending radially from the rotation axis and opposite to the first side surface. Have
The second magnetic body has a third side surface opposed to the second side surface, which is defined by a surface extending radially from the rotation axis,
A central angle formed by the first side surface, the rotation shaft, and the second side surface is equal to a central angle formed by the second side surface, the rotation shaft, and the third side surface.
The motor apparatus of any one of Claims 1-4. The coil section includes a first phase coil section, a second phase coil section, a third phase coil section, a fourth phase coil section, a fifth phase coil section, and a sixth phase coil section that are connected to each other. Including,
The output unit includes, as the superimposed AC voltage, three-phase AC voltages Vu, Vv, Vw whose phases are sequentially shifted by 120 degrees, and six-phase AC voltages Va, Vb, Vc whose phases are sequentially shifted by 60 degrees. A voltage with Vd, Ve, Vf superimposed is output,
A voltage obtained by superimposing the three-phase AC voltage Vu and the six-phase AC voltage Va is applied to the first phase coil unit,
A voltage obtained by superimposing the three-phase AC voltage Vv and the six-phase AC voltage Vb is applied to the second phase coil portion,
A voltage obtained by superimposing the three-phase AC voltage Vw and the six-phase AC voltage Vc is applied to the third-phase coil unit,
A voltage obtained by superimposing the three-phase AC voltage Vu and the six-phase AC voltage Vd is applied to the fourth phase coil unit,
A voltage obtained by superimposing the three-phase AC voltage Vv and the six-phase AC voltage Ve is applied to the fifth phase coil portion,
A voltage obtained by superimposing the three-phase AC voltage Vw and the six-phase AC voltage Vf is applied to the sixth phase coil portion.
The motor apparatus of any one of Claims 1-5. The output unit is
A six-phase inverter having a first phase switching element to a sixth phase switching element connected to the first phase coil unit to the sixth phase coil unit and connected in parallel to a DC power source;
An inverter control unit that PWM-controls the first to sixth switching elements to generate the superimposed AC voltage;
including,
The motor device according to claim 6. A transmission shaft disposed at a position coinciding with the rotation axis and connected to the first rotor to transmit the rotation of the first rotor to the outside;
The motor apparatus of any one of Claims 1-7. A motor device according to claim 8;
A rotating drum in which clothing is housed;
With
The transmission shaft is connected to the rotating drum;
The output unit is
A washing control unit that performs a washing step of washing the clothing, a rinsing step of rinsing the clothing, and a dehydration step of dehydrating the clothing;
By changing the frequency of the first AC voltage, the rotational speed of the first rotor is controlled to the first rotational speed in the washing step and the rinsing step, and the rotational speed of the first rotor is controlled in the dehydration step. A frequency control unit for controlling to a second rotation speed higher than the first rotation speed;
including,
Washing machine. The washing control unit determines an amount of the clothes accommodated in the rotating drum;
The frequency control unit adjusts the rotation speed of the first rotor according to the determined amount of the clothing,
The washing machine according to claim 9.