JP2002200394A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further reduce operation vibration and operation noise in spite of a structure that a stirring body and a revolving tub are rotatively driven by a brushless motor by a direct drive method. SOLUTION: This washing machine is provided with the revolving tub rotatably provided in an outer tub, the stirring body rotatably disposed in the revolving tub, the brushless motor 20 rotatively driving the stirring body or the stirring body and the revolving tub by the direct drive method, a Hall IC 31 detecting the rotation position of the rotor of the brushless motor 20 and outputting a position sensor signal, a control means 67 forming a nearly sinusoidal excitation signal based on the position sensor signal from the Hall IC 31, and a motor exciting means 58 exciting the brushless motor 20 based on the excitation signal from the control means 67.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine provided with a motor for rotating a stirring section and a rotary tub by a direct drive system.

[0002]

2. Description of the Related Art In a washing machine, as is well known, a rotating tub as a washing tub and a dewatering basket is rotatably provided in an outer tub, and an agitating unit, for example, is provided at an inner bottom of the rotating tub. A stirrer is rotatably provided. The agitator and the rotating tank are configured to be driven to rotate by a motor. In the case of this configuration, when the washing operation is performed, the rotation of the motor is reduced and transmitted to the stirrer, and the rotation of the motor is driven forward and reverse while the brake of the rotary tank is stopped. When the spin-drying operation is performed, the rotation of the rotary tub is released, and the rotation of the motor is transmitted to the rotary tub and the agitator without decelerating, and both are driven to rotate at high speed.

In order to perform such a rotational drive, a belt transmission mechanism, a clutch mechanism, a gear reduction mechanism having a built-in planetary gear, and the like are provided in a rotational force transmission path from the motor to the rotary tank and the stirring body. ing. However, in the above-described washing machine, since the belt transmission mechanism, the gear reduction mechanism, and the like are provided in the rotation force transmission path from the motor to the rotary tub and the agitator, the weight of the entire washing machine is increased. However, there is a problem that the size in the vertical direction becomes large, and a considerable noise is generated when the gear reduction mechanism operates.

As a configuration for solving such a problem,
There has been proposed a configuration in which a stirrer and a rotary tank are driven to rotate by a direct drive method using a motor. In this configuration, the rotating tank and the stirrer are directly driven by the motor while the rotary tank is stopped. A clutch is provided for switching the operating state. In this configuration, since the rotary tub and the stirring body are directly driven by the motor, the belt transmission mechanism and the gear reduction mechanism can be omitted, the weight of the entire washing machine can be reduced, and the vertical dimension can be reduced. Can be reduced, and the operating noise of the gear can be eliminated.

[0005]

In the washing machine having the above-mentioned structure, it is necessary to use a motor capable of generating a high torque and variably controlling the rotation speed in a wide range from a low speed to a high speed. For this reason, it has been considered to use a DC brushless motor. This brushless motor is a motor that is energized and driven by an inverter device. In this case, the brushless motor is provided with, for example, three Hall ICs for detecting the rotational position of the rotor, and based on the position sensor signals output from these Hall ICs, the inverter device uses an electrical angle of 120 degrees. A rectangular wave voltage to be energized is generated, and the rectangular wave voltage is supplied to a brushless motor to drive the brush. Note that the configuration for obtaining the position sensor signal by the Hall IC is one of the simplest and cheapest configurations.

In the above-described configuration, when the brushless motor is energized and driven by the rectangular wave voltage, torque fluctuation occurs as the energized phase of the winding is switched, that is, as a result of commutation. For this reason, there is a problem that vibrations are generated in the brushless motor due to the torque fluctuation and operation noise is generated. In particular, in the case of the washing machine configured as described above,
Since the noise is considerably reduced by adopting the direct drive system, the noise caused by the torque fluctuation of the brushless motor becomes conspicuous. Further, since the brushless motor is attached to the outer tub of the washing machine, the outer tub may resonate with the vibration of the brushless motor, and the noise may be increased.

Accordingly, an object of the present invention is to provide a washing machine capable of further reducing the operation vibration and the operation noise while the agitating section and the rotary tub are driven to rotate by a direct drive system by a brushless motor. is there.

[0008]

A washing machine according to the present invention includes a rotating tub rotatably provided in an outer tub, and a stirring section rotatably provided in the rotating tub. A brushless motor for rotating at least one of the agitating unit and the rotary tank by a direct drive method; a rotor position detecting means for detecting a rotational position of a rotor of the brushless motor and outputting a position sensor signal; An energization signal forming unit that forms an approximately sinusoidal energization signal based on the position sensor signal from the position detection unit; and a motor energization unit that energizes the brushless motor based on the energization signal from the energization signal generation unit. The feature is that it consists of

According to the above-described structure, the substantially sinusoidal energizing signal is formed based on the position sensor signal, and the brushless motor is energized based on the energizing signal. Almost no longer occurs. Thereby, the operation vibration and the operation noise of the washing machine can be further reduced.

In addition, instead of the energizing signal forming means, an electric angle detecting means for detecting an electric angle of the rotor based on a position sensor signal, and a storing means for storing energizing waveform data corresponding to the electric angle of the rotor, Energization signal forming means for forming an energization signal by reading energization waveform data from the storage means corresponding to the electrical angle from the electrical angle detection means,
The brushless motor may be controlled to be energized based on the energization signal from the energization signal forming means. In the case of this configuration, energization waveform data that reduces the torque fluctuation is experimentally obtained and stored in the storage unit. Then, the energization signal is formed by reading out the energization waveform data from the storage means corresponding to the electrical angle, and the energization control of the brushless motor is performed based on the energization signal, so that the torque fluctuation of the brushless motor can be minimized. .

In this configuration, there is provided a phase command forming means for forming a phase command, and a voltage command forming means for forming a voltage command, wherein the electric angle from the electric angle detecting means and the phase from the phase command forming means are provided. An electrical angle of the energization waveform is determined based on the instruction, and an energization signal is formed based on the energization waveform data from the storage unit and the voltage command from the voltage instruction forming unit in accordance with the electrical angle. It is preferable to configure the energization signal forming means in the first step.

In this case, the apparatus further comprises voltage detecting means for detecting the voltage of the DC power supply, and based on the electric angle from the electric angle detecting means and the phase command from the phase command forming means, detects the electric angle of the conduction waveform. Is determined, and an energization signal is formed based on the energization waveform data from the storage means, the voltage command from the voltage command formation means, and the DC power supply voltage from the voltage detection means in accordance with the electrical angle. It is also possible to configure.

It is preferable that the energization waveform data stored in the storage means is energization waveform data having a substantially sinusoidal waveform. Further, it is more preferable that during the washing operation, the same phase current is applied to the induced voltage generated in the windings of each phase of the brushless motor. Furthermore, a plurality of washing operation patterns including a phase command pattern are provided, and a phase in which the same phase is applied to an induced voltage generated in each phase winding of the brushless motor simultaneously with the selection of the washing operation pattern. You may comprise so that a command pattern may be selected.

On the other hand, it is preferable that during the dehydrating operation, a phase leading current is applied to the induced voltage generated in each phase winding of the brushless motor. In this case, a plurality of dehydration operation patterns including a phase command pattern are provided, and a phase in which a leading phase is applied to an induced voltage generated in each phase winding of the brushless motor simultaneously with the selection of the dehydration operation pattern. It is a good configuration to select the command pattern. In the braking operation, it is preferable that the phase difference is applied to the induced voltage generated in each phase winding of the brushless motor.

Further, the rotor position detecting means is configured to output, as a position sensor signal, a signal having a predetermined phase relationship with an induced voltage generated in the winding, and the electric angle detecting means includes: It is preferable that the electrical angle of the rotor is detected at a period shorter than a period of change of the position sensor signal.

The electric angle detecting means may include a first counter for measuring a change period of the position sensor signal at a predetermined clock, and a change counter of the position sensor signal at a clock N times the predetermined clock. A second counter that operates based on the measurement result, comprising a multiplied signal generating means for generating a multiplied signal of the position sensor signal; and a counting means for counting the multiplied signal from the multiplied signal generating means. Is good. In the case of this configuration, it is preferable that a rotation cycle detecting means for detecting a rotation cycle of the brushless motor be provided, and the multiplication rate of the multiplied signal be changed based on the rotation cycle from the rotation cycle detection means.

On the other hand, when the rotation stability of the brushless motor is determined to be stable, the first rotation stability is determined by the rotation stability determination means.
Electrical angle data calculating means for calculating electrical angle data of the rotor corresponding to a change in the position sensor signal based on a plurality of measurement results by the counter, and storage means for storing the calculation result by the electrical angle data calculating means When,
It is also preferable that the apparatus further comprises a rotor position estimating means for estimating the position of the rotor in a cycle shorter than a change cycle of the position sensor signal based on the electrical angle data stored in the storage means.

A rotation stability determining means for determining the stability of rotation of the brushless motor, and when the rotation stability determination means determines that the rotation is stable, the first rotation is determined.
Electrical angle data calculating means for calculating electrical angle data of the rotor corresponding to a change in the position sensor signal based on a plurality of measurement results by the counter, and storage means for storing the calculation result by the electrical angle data calculating means When,
It may be configured to include a correction unit that corrects the measurement result of the first counter based on the electrical angle data stored in the storage unit. Furthermore, it is preferable that the rotation stability determination means is configured to determine that the rotation is stable when the rotation cycle detected by the rotation cycle detection means continuously belongs to a predetermined range.

Further, after a rectangular wave voltage formed by performing a logical operation on the position sensor signal is supplied to the brushless motor and started, the voltage based on the energizing signal from the energizing signal forming means is applied to the brushless motor. It is preferable to provide a switching means for switching the supply voltage so as to supply the electric current to the motor and drive the motor. Further, the electrical angle detecting means, the storage means, and the energization signal forming means may be constituted by a one-chip microcomputer. Furthermore, the rotor position detecting means may be constituted by a Hall element.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to a fully automatic washing machine will be described below with reference to FIGS. First, FIG. 2 showing an entire configuration of a fully automatic washing machine.
In the outer box 1, a water receiving tank 2, which is an outer tank for receiving dewatered water, is elastically supported via an elastic suspension mechanism 3. Inside the water receiving tub 2, a rotary tub 4 which is also used as a washing tub and a dewatering basket is rotatably disposed.
A stirring unit, for example, a stirrer 5 is rotatably arranged at the inner bottom of the rotary tank 4.

The rotary tank 4 has a substantially cylindrical tank main body 4a, an inner cylinder 4b provided inside the tank main body 4a for forming a water passage gap, and an upper end of the tank main body 4a. The balance ring 4c is provided. When the rotary tank 4 is driven to rotate, the water inside rises along the inner peripheral surface of the tank main body 4a by centrifugal force and passes through a dehydration hole (not shown) formed in the upper part of the tank main body 4a. It is configured to be discharged into the water receiving tank 2.

A drain port 6 is formed at the right end of the bottom of the water receiving tank 2 in FIG. 2, and the drain port 6 is provided with a drain valve 7 and a drain hose 8 is connected thereto. . The drain valve 7 is a valve that is opened and closed by a drain valve motor 9 (see FIG. 1) as a drain valve driving unit described later, and is a so-called motor type drain valve. The drain valve motor 9 is composed of, for example, a geared motor. Further, an auxiliary drain port 6 is provided at the left end of the bottom of the water receiving tank 2 in FIG.
The auxiliary drain port 6a is connected to a drain hose 8 via a connecting hose (not shown). The auxiliary drain port 6a is for draining water that has been dewatered from the upper portion and discharged into the water receiving tank 2 when the rotary tub 4 is dewatered and rotated.

As shown in FIG. 3, a mechanism base 10 is attached to the outer bottom of the water receiving tank 2. A shaft support cylinder 11 is formed at the center of the mechanism base 10 so as to extend in the vertical direction. This shaft support cylinder 1
Inside 1, a hollow tank shaft 12 is rotatably inserted and supported via bearings 13, 13. A stirring shaft 14 is rotatably inserted and supported inside the tank shaft 12 via bearings 15 and 15. The upper and lower ends of the stirring shaft 14 are
It protrudes from the tank shaft 12.

Further, the shaft support cylinder 11 of the mechanism base 10
Is fitted through a seal 16 into a through hole 2a formed in the center of the bottom of the water receiving tank 2. The seal 16 seals the space between the upper end of the shaft support cylinder 11 and the through hole 2a of the water receiving tank 2 in a watertight manner. Furthermore, the seal 16 is also provided between the outer peripheral surface of the tank shaft 12 and the upper end of the shaft support cylinder 11, and the space therebetween is sealed in a watertight manner. Further, a flange portion 12a is formed integrally with the upper end portion of the tank shaft 12. The rotary tank 4 is connected and fixed to the flange portion 12a via a tank receiving plate 17. Thereby, the rotary tank 4 is attached to the tank shaft 12 so as to rotate integrally. In addition, at the upper end of the stirring shaft 14, FIG.
As shown in FIG. 2, the stirrer 5 is fitted and screwed and fixed, so that the stirrer 5 is attached to the stirring shaft 14 so as to rotate integrally.

A drain cover 18 is attached to a portion between the center of the inner bottom of the water receiving tank 2 and the drain port 6 as shown in FIG. The drain cover 18 forms a drain passage 19 communicating from the through hole 4d provided at the bottom of the rotary tub 4 to the drain port 6. In the case of this configuration, when water is supplied into the rotary tank 4 with the drain valve 7 closed, water is stored in the rotary tank 4 and the drain passage 19. When the drain valve 7 is opened, the water in the rotary tank 4 is drained through the through hole 4d, the drain passage 19, the drain port 6, the drain valve 7, and the drain hose 8.

The mechanism base 1 at the outer bottom of the water receiving tank 2
0, for example, an outer rotor type brushless motor 20
Is provided. Specifically, as shown in FIG. 3, the stator 2 of the brushless motor 20 is
1 is concentric with the stirring shaft 14 so that a stepped screw 22
It is fastened and fixed. The stator 21 includes:
As shown in FIG. 4, the laminated core 23 and the upper bobbin 24
, A lower bobbin 25, and a winding 26 (see FIG. 3). The laminated core 23 is, as shown in FIG.
It is configured by connecting three unitary iron cores 23a having a substantially arc shape in an annular shape. In addition, the upper and lower bobbins 24, 25
Is made of plastic and has a laminated core 23
Are fitted from above and below. And
The winding 26 is wound around the fitted bobbins 24 and 25. As shown in FIG. 1, the winding 26 includes three-phase windings 26U, 26V, and 26W.

On the other hand, the rotor 27 of the brushless motor 20
Is attached to the lower end of the stirring shaft 14 so as to rotate integrally therewith, as shown in FIG. Rotor 27
Is composed of a rotor housing 28, a rotor yoke 29, and a rotor magnet 30. Here, the rotor housing 28 is formed by, for example, aluminum die-casting, and has a boss portion 28a formed in the center portion and a magnet arrangement portion 28b formed in the outer peripheral portion. The lower end of the stirring shaft 14 is fitted and fixed in the boss 28a.

The magnet arrangement portion 28b has a horizontal portion and a vertical portion. The rotor yoke 29 is brought into contact with the inner surface of the vertical portion, and the rotor yoke 27 is fixed to the horizontal portion by screwing. . A plurality of rotor magnets 30 are mounted on the inner surface of the rotor yoke 27 by, for example, bonding. As shown in FIGS. 3 and 5, a large number of ribs 28 c are radially protruded from a portion of the upper surface of the peripheral portion of the rotor housing 28 facing the winding 26 of the stator 21.
Further, on the upper surface of the central portion of the rotor housing 28, a plurality of projections 28d are radially projected around the axis. The plurality of convex portions 28d constitute an engaging portion.

On the other hand, as shown in FIG. 3, the rotor magnet 3 of the rotor 27
For example, three Hall ICs (magnetic detection elements) 31 are used as the rotor position detecting means for detecting the rotation position of the mounting fixture 32.
(FIG. 3 shows one hole I).
Only C31 is shown). As shown in FIG. 1, the three Hall elements 31 are Hall ICs 31u, 31v, and 31w arranged every 120 degrees in electrical angle.

The clutch 3 is provided at the lower end of the tank shaft 12.
2 are provided. The clutch 32 is connected so that the rotor 27, the stirring shaft 14 and the tank shaft 12 rotate together during the dehydrating operation, and so that only the tank shaft 12 does not rotate integrally with the rotor 27 and the stirring shaft 14 during the washing operation. It has a function of switching between a mode in which connection is released. Hereinafter, the clutch 32 will be specifically described. First, as shown in FIG. 6, the clutch 32 includes a switching lever 33 having a rectangular frame shape, and a holder 34 disposed inside the switching lever 33.

The holder 34 is attached to the lower end of the tank shaft 12 so as to rotate integrally therewith. Specifically, as shown in FIG. 5, a pair of flat surface portions 12b, 12b are formed on the outer peripheral surface of the lower end portion of the tank shaft 12. A fitting hole 34a into which the lower end of the tank shaft 12 fits is formed in the center of the holder 34. A flat surface portion with which the flat surfaces 12b, 12b of the tank shaft 12 abut is formed on the inner surface of the fitting hole 34a. Also, the holder 34
The pivot recess 3 having a substantially semicircular cross section is provided on the outer surface of the left end in FIG.
4b is formed. In the case of the above configuration, the holder 34 is fixed to the tank shaft 12 by screwing in a state where the lower end of the tank shaft 12 is inserted and fitted into the fitting hole 34a of the holder 34. Further, for example, a wave washer 35 is provided between the holder 34 and the lower bearing 13. This wave washer 35 presses the lower bearing 13 upward.

On the other hand, as shown in FIGS. 5 and 6, the switching lever 33 is fitted with a holder 34 therein.
It is configured to rotate integrally with the holder 34 and the phase shaft 12. On the inner surface side of the base end portion 33a (the left end portion in FIG. 5) of the switching lever 33, a pivoting convex portion 33b (see FIG. 3) having a substantially semicircular cross section to be fitted with the pivoting concave portion 34b of the holder 34 is provided. Is formed. In this case, the switching lever 33 is configured to rotate in the vertical direction with the fitting portion between the pivotal projection 33b and the pivotal recess 34b as a pivot point.

A toggle spring 36 is provided between the switching lever 33 and the holder 34, as shown in FIGS. By the spring force of the toggle spring 36, the switching lever 33 is held in a state where it has been moved to an upper rotation position (see FIG. 1) or a state where it has been moved to a lower rotation position (see FIG. 7). It is configured to be held. Projections 33d and 33e are protrudingly provided at the upper and lower ends of the tip 33c of the switching lever 33. Also,
The operated portion 3 is provided on the outer surface of the tip portion 33c of the switching lever 33.
3f is protruded.

On the other hand, as shown in FIGS. 3 and 5, a concave portion 37 is formed on the lower surface of the central portion of the mechanical base 10, which is a stationary portion, so as to correspond to the convex portion 33d on the upper part of the switching lever 33. Have been. In the case of this configuration, the switching lever 3
When the rotating operation of the upper lever 3 is performed (see FIG. 1, in this case, during the washing operation), the convex portion 33 d of the switching lever 33 is fitted into the concave portion 37 of the mechanism base 10. Thereby, the tank shaft 12 and thus the rotary tank 4 are fixed to the mechanical base 10 which is a stationary part. In the fitting state between the concave portion 37 and the convex portion 33d, the connection is released so that only the tank shaft 12 does not rotate integrally with the rotor 27 and the stirring shaft 14.
In the case of this embodiment, the stirring shaft 14 and the stirring body 5 are directly driven to rotate by the brushless motor 20. still,
The rotor 27 and the stirring shaft 14 are originally connected so as to rotate integrally.

On the other hand, when the switching lever 33 pivots downward (see FIG. 7, in this case, during the spin-drying operation),
The lower protrusion 33e of the switching lever 33 is engaged between the plurality of protrusions 28d on the upper surface of the rotor housing 28. Thereby, the tank shaft 12 and the rotor 27 (and the stirring shaft 14) are connected so as to rotate integrally. In the case of this embodiment, the tank shaft 12, the rotary tank 4, the stirring shaft 14, and the stirring body 5
The brushless motor 20 is directly driven to rotate. As a result, the brushless motor 20 is configured to rotationally drive the stirrer 5 or the stirrer 5 and the rotary tank 4 by a direct drive method.

A control lever 38 is rotatably supported at the right end of the mechanism base 10 in FIG. As shown in FIG. 6, the distal end of the control lever 38 is bifurcated, and a downward inclined surface 38a is formed at one of the distal ends (rightward in FIG. 6). ,
At the other end (left side in FIG. 6), an upward inclined surface 38b is formed. In this case, when the control lever 38 is rotated in one direction by the drain valve motor 9 that drives the drain valve 7, the operated portion 33f of the switching lever 33 of the clutch 32 is lowered by the downward inclined surface 38a of the control lever 38. , The switching lever 33 is rotated downward, and the state shown in FIG. 7 is obtained. The state shown in FIG. 7 corresponds to the dehydration operation, and the drain valve 7 is open.

On the other hand, in the state shown in FIG.
Is turned off, the control lever 38 is rotated in the reverse direction by the spring force of the return spring of the drain valve 7, and the operated portion 33f of the switching lever 33 is moved upward by the upward inclined surface 38b of the control lever 38. When pressed, the switching lever 33 is pivoted upward to be in the state shown in FIG. The state shown in FIG. 1 corresponds to the washing operation, and the drain valve 7 is closed.

Next, the electrical configuration of the above-described fully automatic washing machine will be described with reference to FIG. In FIG. 1, both terminals of an AC power supply 39 are connected to the input terminal of a full-wave rectifier circuit 41 via a reactor 40 on one side. The smoothing capacitors 42a, 4a
2b are connected, and the smoothing capacitors 42a, 4b
A DC power supply circuit 43 is composed of 2b and the full-wave rectifier circuit 41.

A DC bus 44a, 44b is derived from an output terminal of the DC power supply circuit 43, and a constant voltage circuit 45, a discharge circuit 46,
The inverter main circuit 47 is connected. A relay 48 and a diode 49 of the illustrated polarity are provided at a portion of the DC bus 44a between the constant voltage circuit 45 and the discharge circuit 46.
Are connected in parallel. The discharge circuit 46 includes a discharge resistor 50 and a switching element 51 such as an IGBT.
Are connected in series. The control terminal (gate) of the switching element 51 is connected to a drive circuit 52 composed of, for example, a photocoupler. In this case, the discharging circuit 53 and the driving circuit 52 constitute a discharging unit 53.

The inverter main circuit 47 includes three-phase bridge-connected switching elements 54a to 54f made of, for example, IGBTs, and these switching elements 54a to 54f.
54f are connected to freewheel diodes 55a to 55f respectively connected in parallel. The output terminals 56u, 56v, 5
6w is a three-phase winding 26u of the brushless motor 20;
6v, 26w. The control terminals (gates) of the switching elements 54a to 54f of the inverter main circuit 47 are connected to the drive circuit 5 composed of, for example, a photocoupler.
7a to 57f. In this case, the motor main means 58 is composed of the inverter main circuit 47 and the driving circuits 57a to 57f (that is, the driving circuit 57).

On the other hand, the position sensor signal H output from the three Hall ICs 31a to 31c of the brushless motor 20
u, Hv, Hw are the microcomputer 59 (hereinafter, referred to as the microcomputer 59).
(Referred to as a microcomputer 59). The microcomputer 59 has a function of controlling the energization of the brushless motor 20 and a function of controlling the overall operation of the fully automatic washing machine. A control program therefor and data necessary for executing this program (energization waveform data described later) Etc.) are stored in the ROM 59a provided therein. Further, a RAM 59b is provided inside the microcomputer 59 as a work area. In this case, the microcomputer 59 is configured to have each function as an electrical angle detecting unit, a storage unit, a phase command forming unit, and a voltage command forming unit.

The microcomputer 59 is connected to two counters 60 and 61 each composed of, for example, a 16-bit counter. The first counter 60 receives the reset signal RS1 from the microcomputer 59, counts a clock signal ck1 of, for example, 125 KHz, and supplies data DT1, which is a count result (count value data), to the microcomputer 59. The second counter 61 receives the reset signal RS2 from the microcomputer 59, counts the 1 MHz clock signal ck2 which is eight times the frequency of the clock signal ck1, and counts this count value and the microcomputer 5 clock signal ck2.
The microcomputer 59 is configured to provide a coincidence signal with data DT2 (which will be described later) provided from the microcomputer 9 as a signal ST2 to the microcomputer 59.

The microcomputer 59 outputs, for example, 8-bit output waveform data Du and D as described in detail later.
v, Dw, and these output waveform data Du, Dv,
Dw is provided to three comparators 62, 63, 64. The comparators 62, 63, and 64 output, for example, 8-bit output data Pz output from the triangular wave generation circuit 65 and output waveform data D from the microcomputer 59.
u, Dv, Dw, and output waveform data Du, D
The output signal V is at a high level when v and Dw are greater than the output data Pz, and at a low level otherwise.
It is configured to output u, Vv, and Vw. These output signals Vu, Vv, Vw are supplied to the selection circuit 66.
It is configured to be given to. Note that the triangular wave generation circuit 65 includes a carrier wave Pz composed of a digital triangular wave.
(That is, a circuit configured to generate 8-bit output data Pz).

Further, the microcomputer 59 outputs selection signals U1, U2, V1, V2, W1, W
2, and the selection signals U1, U2, V1, V2,
It is configured to provide W1 and W2 to the selection circuit 66. Then, the selection circuit 66 outputs the output signals Vu, V
v, Vw and the selection signals U1, U2, V1, V2,
Based on W1 and W2, the driving signal Vu will be described later.
p, Vun, Vvp, Vvn, Vwp, Vwn, and these drive signals Vup, Vun, Vvp, Vvn,
Vwp and Vwn are provided to the drive circuits 57a to 57f. Note that the selection circuit 66 is provided in FIG.
As shown in (1), it is composed of an AND circuit 66a and a NAND circuit 66b. In FIG. 8, only the U phase is shown and the V and W phases are not shown.
The specific circuit configurations of the phase and the W phase are the same as those of the U phase.

In the case of this configuration, the microcomputer 5
9, counters 60 and 61, comparators 62, 63 and 64, a triangular wave generation circuit 65 and a selection circuit 66 constitute a control means 67. The control means 67 constitutes an energization signal forming means. The control device 67, the motor energizing device 58, the discharging device 53 and the DC power supply circuit 43 constitute an inverter device 68.

On the other hand, the microcomputer 59 is configured to be able to detect the voltage value of the DC bus 44 a via the voltage dividing circuit 69. In this case, the voltage signal output from the voltage dividing circuit 69 is supplied to an input terminal of the microcomputer 59 having an A / D conversion function. In addition, the microcomputer 59
Is configured to control on / off of the relay 48 via a relay drive circuit 70. Furthermore, the microcomputer 5
Numeral 9 is configured to control the energization of the drain valve motor 9 for driving the drain valve 7 to open and close and the water supply valve 71 for supplying water into the rotary tank 4.

The microcomputer 59 is provided with a power failure detection signal from a power failure detection circuit 72 for detecting a power failure based on the voltage of the AC power supply 39, and a water level sensor 7 for detecting the water level in the rotary tank 4.
3, the water level detection signal from the lid 3, the lid 7 provided on the upper part of the outer box 1.
4 (see FIG. 2) is configured to receive an open / close detection signal from a lid switch 75 for detecting an open / close state and switch signals from various operation switches 76 provided on an operation panel.

Next, the operation of the above configuration (specifically, the control operation during the washing operation and the dehydration operation) will be described with reference to FIGS. Here, FIGS. 15 to 18
9 is a flowchart showing control contents of a control program stored in the microcomputer 59. Among these, the flowchart of FIG. 15 shows the control content of the main processing of the washing operation and the dehydration operation. The flowchart of FIG.
The control content of the main process for motor drive is shown. The flowchart of FIG. 17 shows the control contents of the first interrupt processing. The flowchart of FIG. 18 shows the control contents of the second interrupt processing.

First, the operation of the washing operation will be described.
When connected to the AC power supply 39, first, an initial setting process of step M10 in FIG. 15 is executed. Here, the microcomputer 59 performs initialization of the RAM 59b, initial output of an output terminal, and the like. Subsequently, one of various operation switches 76 is selected.
It is determined whether the power switch, which is one of the two switches, has been turned on (step M20). Here, if the power switch is off, the process proceeds to “NO” in step M20, and the microcomputer 59 outputs an off signal to the relay drive circuit 70 to turn off the relay 48 (step M20).
30). Then, the process returns to the determination processing of Step M20.

On the other hand, if the power switch is turned on in step M20, the process proceeds to "YES" and the microcomputer 5
9 turns on (turns on) the relay 48 by outputting an ON signal to the relay drive circuit 70 (step M4).
0). Then, it is determined whether or not a washing operation command has been issued (step M50). In this case, it is determined whether or not a washing operation command has been issued based on the operation results of the various operation switches 76. Now, if a washing operation command is issued,
Proceeding to "YES" in step M50, the drain valve motor 9
Is output (step M60). As a result, the drain valve motor 9 is turned off, the drain valve 7 is closed, and the switching lever 33 of the clutch 32 is rotated upward so that the tank shaft 12 and the rotary tank 4 are stationary parts. (See FIG. 3).

Subsequently, the routine proceeds to step M70, where one course is selected and set from a plurality of washing operation courses.
In this case, one course is selected and set based on the operation results of various operation switches 76. And step M
Proceeding to 80, a process of supplying water into the rotary tank 4 is executed. Here, the water supply valve 71 is energized and opened to start supplying water into the rotary tub 4 and the water level sensor 73 detects that the water level in the rotary tub 4 has reached the water level corresponding to the selected course. Then, the water supply valve 71 is configured to stop the power cut and close.

Then, steps M90, M100, M1
An operation pattern (operation command) for the brushless motor 20 is formed by sequentially executing the processes of 10. In this case, a plurality of washing operation patterns are stored in advance in the ROM 59a, and a washing operation pattern corresponding to the selected course is selected and read out from among the plurality of washing operation patterns, thereby obtaining a washing operation pattern. Operating pattern (washing operation pattern). FIG. 10 shows an example of the washing operation pattern.

As shown in FIG. 10, the washing operation pattern includes, for example, a drive command consisting of 2-bit data, a voltage command Vc consisting of 8-bit data, and a phase command Pc consisting of, for example, 9-bit data. It is composed of The drive command is data representing drive / stop and forward / reverse rotation of the brushless motor 20. Specifically, for example, when the lower one bit is “1”, the drive is indicated, and the lower one bit is “0”. When the upper one bit is "1", it indicates normal rotation, and when the upper one bit is "0", it indicates reverse rotation. The voltage command Vc is data representing a voltage applied to the brushless motor 20. The phase command Pc is data representing the phase of the voltage with respect to the rotor phase of the brushless motor 20.

The washing operation pattern shown in FIG. 10 includes “forward rotation driving” for 1.5 seconds, “stop” for 0.5 seconds, “reverse rotation driving” for 1.5 seconds, and “ This is an operation pattern for 4 seconds in one cycle composed of "stop", and the operation pattern for 4 seconds in one cycle is repeatedly executed during the washing operation. Here, the operation pattern for one cycle and four seconds is, for example, 50
It consists of the above three command data sampled in ms (milliseconds). That is, assuming that the above three command data are one set of data, the operation pattern for one cycle and four seconds is composed of 80 sets of data.
0 sets of data are stored in the ROM as the washing operation pattern in FIG.
59a. Here, the phase command Pc of the washing operation pattern in FIG.
0 is data obtained experimentally so that the phase of the current flowing in each phase of the winding 26 and the phase of the induced voltage generated in each phase of the winding 26 are the same. This will be described in detail later. I do.

Now, Step M90, Step M10
0, in step M110, when reading the washing operation pattern from the ROM 59a, the set of data, that is, three command data, is sequentially read every 50 ms. The read three command data are used as a motor drive command, a motor voltage command Vc, and a motor phase command Pc, respectively, and are used to form a motor drive command, a motor voltage command Vc, and a motor phase command Pc. (Step M90, Step M100, Step M110).

Subsequently, it is determined whether or not the washing operation is completed (step M120). If not, the process proceeds to "NO" in step M120, and returns to step M90 to form the above three command data. The processing is repeated. On the other hand, if the washing operation is to be ended, the process proceeds to "YES" in step M120, a motor stop command is issued, and the brushless motor 20 is cut off to stop the washing operation (step M121). Thereafter, the process is configured to return to step M20. The determination as to whether or not the washing operation has been completed is made by determining whether or not the washing operation time set corresponding to the selected course has elapsed.

The actual energization drive of the brushless motor 20 is performed on the motor drive main processing in FIG. 16, the first interrupt processing in FIG. 17, and the second interrupt processing in FIG. Each of these processes will be described below. First, the main process for driving the motor in FIG. 16 is configured to be executed simultaneously (parallel) with the main process in FIG. 15 every 10 ms (milliseconds), for example. In other words, the motor drive main process in FIG. 16 is an interrupt process executed every 10 ms.

In the main process for driving the motor, first, in step D10, step M in FIG.
The motor start condition is determined based on the motor drive command formed at 90. Here, the case where the motor drive command formed in step M90 is drive is “Y”, the case of stop is “N”, and it is determined whether it is “Y” or “N”. ”Means that the last time was“ Y ”and this time was also“ Y ”(hereinafter“ YY ”), or the last time was“ N ”and this time is“ Y ”
Is determined (hereinafter referred to as “NY”).

If the motor start condition is "N" (that is, if it is a stop command), step D
Proceed to "NO" at 10 to select signals U1, U2, V1,
V2, W1, and W2 are all set to "L (low level)" (step D20). As a result, the selection circuit 66 sets the drive signals Vup, Vun, Vvp, Vv
n, Vwp, and Vwn, and these drive signals Vup,
Vun, Vvp, Vvn, Vwp, Vwn
7a to 57f. As a result, all of the switching elements 54a to 54f of the inverter main circuit 47 are turned off, and the interruption of the brushless motor 20 is stopped.
Then, after prohibiting the execution of the first interrupt process and the second interrupt process (step D21), the process returns (the execution of the main process for driving the motor is completed).

On the other hand, if it is determined in step D10 that the motor start condition is "NY" (that is, immediately after the motor start (start) command is received), "N" is set in step D10. -Y ", and sets the start flag to" H (high level) "(step D3)
0). Subsequently, after permitting the execution of the first interrupt process and the second interrupt process (step D40), a command to forcibly execute the first interrupt process is issued to execute the first interrupt process once. (Step D50). And
It is determined whether or not a predetermined period of time (for example, 100 ms) has elapsed after receiving the motor start command (step D60).

Here, if the predetermined time has not elapsed,
The process proceeds to "NO" in step D60 and returns. On the other hand, if the predetermined time has elapsed after receiving the motor start command, the process proceeds to "YES" in step D60, sets the start flag to "L" (step D70), and returns.

If it is determined in step D10 that the motor start condition is "Y-Y" (that is, if the motor start command is continued), the process proceeds to "Y-Y" in step D10. Proceed to step D6 described above.
It is configured to shift to the determination process of 0 and execute the same control.

Next, control contents of the first interrupt processing shown in FIG. 17 will be described. This first interrupt processing is performed when any of the position sensor signals Hu, Hv, Hw (see (c) of FIG. 19) output from the Hall ICs 31u, 31v, 31w changes from “H” to “L”. ,
The interrupt processing is executed when the state changes from "L" to "H" and when a forced command is issued in step D50 of FIG.

Specifically, in step A10 of FIG. 17, first, the position sensor signals Hu, Hv, Hw from the Hall ICs 31u, 31v, 31w are inputted, and the position sensor signals inputted based on the conversion table shown in FIG. Signal H
The mode n (n = 1 to 6) of u, Hv and Hw is determined.
Subsequently, the data DT output from the first counter 60
1 is input and stored as the sensor change period Ts (n) (step A20). And a reset signal RS
1 is given to the first counter 60 to reset the first counter 60 (step A30).

By executing steps A20 and A30, the first counter 60 outputs the position sensor signal H
Each time u, Hv, Hw change, it is reset,
The count value immediately before resetting of the first counter 60 (in this case, the count value by the clock ck1) is stored as the sensor change period Ts (n) corresponding to the mode n.

Subsequently, the process proceeds to step A40, in which the data DT1 output from the first counter 60 is used as data DT2, and the data DT2 is given to the second counter 61. Then, the process proceeds to step A50, in which a reset signal RS2 is provided to the second counter 61 to reset the second counter 61.

Further, the process proceeds to step A60, and based on the electrical angle data table shown in FIG.
To rewrite the electric angle counter EC, specifically, EC = Ex (n). In this case, the electrical angle data Ex (n) indicates the rotation position of the rotor 27 of the brushless motor 20 at the change point of the position sensor signals Hu, Hv, Hw in electrical angle, and the electrical setting data of the work area is obtained by the initial setting process. The data is written in the RAM 59b as shown in FIG. The electric angle counter EC is provided with a rotor 27.
The rotational position of the motor is defined as one electric cycle based on an induced voltage (hereinafter, referred to as a U-phase induced voltage) generated in the U-phase winding 26u by 3
The data is divided into 84 parts and stored in the RAM 59 of the work area.
b.

Then, the process proceeds to a step A70, in which a process for calculating and obtaining a rotation period Tm, which is the time of one electric cycle of the brushless motor 20, is executed. Here, the previously obtained Tm is defined as Tmp (Tmp = Tm), this Tmp is stored, the current Tm is calculated by the following equation, and the calculated Tm is stored.

Tm = Ts (1) + Ts (2) + Ts
(3) + Ts (4) + Ts (5) + Ts (6) Then, the process proceeds to step A80, and it is determined whether or not the start flag is "H". Here, immediately after receiving the motor start command (start command) (that is, before a predetermined time has elapsed after receiving the motor start command), since the start flag is “H”, step A80 is executed. At "YE
The process proceeds to "S", and a process of reading a voltage command Vc indicating the magnitude of the voltage applied to the brushless motor 20 is performed (Step A90). Subsequently, the process proceeds to step A100, and FIG.
The output waveform data Du, Dv, Dw and the selection signals U1, U2, V1, V2,
W1 and W2 are output, and the routine returns (the execution of the first interrupt processing is completed). Steps A90 and A100
Is a process for controlling the energization of the brushless motor 20 with a rectangular wave voltage when the brushless motor 20 is started, and will be described in detail later. On the other hand, if the start flag is "L" in step A80, the process proceeds to "NO" and returns.

Next, the control contents of the second interrupt processing shown in FIG. 18 will be described. The second interrupt processing is performed by counting the count value of the second counter 61 (clock ck2).
This is an interrupt process executed by the coincidence signal ST2 generated each time the data DT2 matches the data DT2, that is, an interrupt process executed each time the coincidence occurs.

Specifically, in step B10 of FIG. 18, first, a reset signal RS2 for resetting the second counter 61 is output, and the second counter 61 is reset. Subsequently, a calculation for increasing the electric angle counter EC by a constant Ed is performed (step B20). Here, EC
= EC + Ed is calculated. At this time, if EC ≧ 384, the calculation of EC = EC-384 is performed. The constant Ed
Is a constant stored in advance, and in this embodiment,
For example, "8" is set.

Then, the process proceeds to a step B30, where it is determined whether or not the start flag is "H". Here, immediately after receiving the motor start command (start command) (that is,
If the predetermined time has not elapsed after receiving the motor start command (because the start flag is “H”), step B3
At 0, the process proceeds to "YES" and returns (the execution of the second interrupt process is completed). In step B30, "N
The control for proceeding to "O" will be described later.

The control operation of the microcomputer 59 described above is as follows.
This is the operation of the motor driving program when the start flag is in the “H” state after receiving the start signal (motor start command). Next, a specific operation when the brushless motor 20 is driven to rotate forward by this control operation will be described.
This will be described with reference to the time chart shown in FIG.

In FIG. 19, (a) shows a three-phase winding 26u when the brushless motor 20 is rotating.
The induced voltages generated at 26v and 26w are shown. This induced voltage indicates the rotational position of the rotor 27 (that is, the rotor position). Then, one electric cycle based on the U-phase induced voltage among the three-phase induced voltages is 384.
The electrical angle is represented by the divided data, and this electrical angle is shown in FIG. FIG. 19C shows the position sensor signal H output from the Hall ICs 31a to 31c.
u, Hv, and Hw. In this case, the Hall ICs 31a to 31c are mounted so that the position sensor signals Hu, Hv, Hw change from "H" to "L" or from "L" to "H" at the cross point of the induced voltage of each phase. ing.

FIG. 19D shows the mode (n) determined in the process of step A10 of the first interrupt process (FIG. 17). FIG. 19E shows selection signals U1, U2, V1, V2, W1, and W2 output from the microcomputer 59 in step A100 of the first interrupt processing (FIG. 17). 59, the output waveform data Du, Dv,
The output waveform data Du of U phase of Dw is shown in FIG.
Shown in

Here, the U-phase comparator 62 in the control means 67 outputs the U-phase output waveform data Du (specifically, 8
Bit data Vc) and the carrier wave Pz output from the triangular wave generation circuit 65 (specifically, 8-bit output data Pz)
And outputs a signal Vu. This signal Vu is
The frequency is synchronized with the operation of the triangular wave generation circuit 65 (carrier wave Pz), and the duty is a pulse width modulation signal (hereinafter referred to as a PWM signal) depending on the output waveform data Du. The signals Vv and Vw output from the V-phase comparator 63 and the W-phase comparator 64 are also similar PWM signals.

Looking at the U phase, the selection circuit 6
6 outputs drive signals Vup and Vun based on the signal Vu and the selection signals U1 and U2. In this case, the selection circuit 6
6, when the selection signal U1 = “H” and the selection signal U2 = “L”, the drive signal Vup = the signal Vu and Vun = “L”
Are output as drive signals Vup and Vun. Thus, the switching element 54a is PWM-driven via the drive circuit 55a.

The selection circuit 66 outputs the selection signal U1 =
When "L" and the selection signal U2 = "H", the drive signal V
drive signal Vup for which up = “L” and Vun = “H”,
Output Vun. Thereby, the switching element 54b is turned on via the drive circuit 55b. Further, the selection circuit 66 selects the selection signal U1 = “L” and the selection signal U2 =
When “L”, the drive signal Vup = “L” and Vun =
The drive signals Vup and Vun that become “L” are output. As a result, the switching elements 54a and 54b are both turned off.

In the same manner as in the above-mentioned U-phase, the selection circuit 66 for the V-phase and W-phase also outputs the drive signal Vv based on the signals Vv, Vw and the selection signals U3, U4, U5, U6.
p, Vvn, Vwp, and Vwn are output. Here, FIG.
9 (h) is a drive signal Vu output from the selection circuit 66.
p, Vun, Vvp, Vvn, Vwp, and Vwn are shown. These drive signals Vup, Vun, Vvp, Vv
The switching elements 54a to 54f are on / off controlled by n, Vwp, and Vwn via drive circuits 57a to 57f. As a result, the brushless motor 20 is configured to be so-called 120-degree energized at the time of starting, that is, to be rotationally driven while energized by a rectangular wave voltage.

FIG. 19 (i) shows how the first counter 60 is reset (and counted) in step A30 of the first interrupt process (FIG. 17). In this case, the reset operation of the first counter 60 is executed at the change point of the mode (n). The first interrupt processing (FIG. 17) is also configured to be executed at the change point of the mode (n).

FIG. 19 (j) shows how the second counter 61 is reset (and counted) by the steps A20, A40 and A50 of the first interrupt processing (FIG. 17). I have. Second counter 61
Operates at a clock ck2 that is eight times the clock ck1 of the first counter 60.
As shown in (j), the counting operation is repeated at a period of 1/8 of the first counter 60. In this case, the first counter 60 and the second counter 61 constitute a multiplied signal generating means 77 for generating a multiplied signal of the position sensor signal. Thus, the second interrupt processing (FIG. 1)
8) is configured to be executed eight times during one mode (n).

FIG. 19 (k) shows the count-up operation of the electrical angle counter EC executed in step A60 of the first interrupt processing (FIG. 17) and step B20 of the second interrupt processing (FIG. 18). Is shown. In this case, the electrical angle counter EC is rewritten at the change point of the mode (n) by executing the step A60 of the first interrupt processing (FIG. 17), and the second interrupt processing (FIG. 1).
By performing step B20 of 8), the count is increased eight times during one mode (n). Thus, the electrical angle counter EC is data that changes in synchronization with the rotational position of the rotor 27.

As described above, upon receiving the start command, the brushless motor 20 is driven to rotate by the rectangular wave voltage, and the rectangular wave energization control is performed for a predetermined time (specifically, 100 ms) after receiving the start command. It can be continued for a while. After that, when a predetermined time has elapsed after receiving the start command, the main process for driving the motor (FIG. 1)
In step D60 of step 6), the process proceeds to "YES" to execute processing for switching the start flag to "L" (step D7).
0).

Next, the control operation of the microcomputer 59 when the start flag is "L" will be described. In this case, first
In the first interrupt process (FIG. 17), since the start flag = “L”, the process proceeds to “NO” in step A80 and returns (without executing steps A90 and A100).

In the second interrupt processing (FIG. 18), since the start flag = “L”, the step B3
If “0”, the process proceeds to “NO”, and the processes of steps B40 to B100 are executed. Specifically, first, in step B40, the phase command Pc formed in step M190 of the main process (FIG. 15) is read. Subsequently, step B5
At 0, the phase Pv of the voltage applied to the brushless motor 20 is calculated by the phase command Pc and the electric angle counter EC indicating the rotational position of the rotor 27. This calculation is
The following equation is used.

Pv = EC + Pc However, if Pv ≧ 384, Pv = Pv−384 is performed.

Then, the process proceeds to a step B60, in which the voltage command Vc formed in the step M180 of the main process (FIG. 15) is read. Subsequently, step B70
Then, the output waveform data Du is calculated and output. In this case, the voltage ratio Ds of the sinusoidal waveform corresponding to the calculated voltage phase Pv is read from the energization waveform data shown in FIG. 9, and the output waveform data Du is calculated by the following equation.

Du = Ds × (Vc / 256) +128 Here, the area of the voltage ratio Ds as the data value is “−127 to 127” which can be represented by the complement expression of 8-bit data. Then, “0 to 2” which is the area of the triangular wave data Pz
To shift to “55”, “128” is added as an offset value. Further, since the area as the data value of the voltage command Vc is “0 to 255”, (Vc / 2
56) is multiplied by the voltage ratio Ds to obtain the voltage command Vc.
Is obtained in accordance with. Then, the result calculated in this way is output as output waveform data Du. The energization waveform data shown in FIG. 9 is composed of 8-bit voltage rate data Ds obtained by dividing one electric cycle into 384, and this voltage rate data Ds
Is stored in advance in the ROM 59a. In the case of the present embodiment, sine wave waveform data is stored as the energization waveform data.

Then, the process proceeds to a step B80, where the output waveform data Dv is calculated and output. In this case, first, the voltage phase Pv is calculated by the following equation.

Pv = EC + Pc + 256 However, when Pv ≧ 384, Pv = Pv−384 is performed.

Next, after reading the voltage ratio Ds of the sinusoidal waveform corresponding to the calculated voltage phase Pv from the energization waveform data shown in FIG. 9, the output waveform data Dv is calculated by the following equation.

Dv = Ds × (Vc / 256) +128 Then, the process proceeds to step B90, where the output waveform data Dw is calculated and output. Also in this case, first, the voltage phase Pv is calculated by the following equation.

Pv = EC + Pc + 128 If Pv ≧ 384, Pv = Pv−384 is performed.

Next, after reading out the voltage ratio Ds of the sinusoidal waveform corresponding to the calculated voltage phase Pv from the energized waveform data shown in FIG. 9, the output waveform data Dw is calculated by the following equation.

Dw = Ds × (Vc / 256) +128 Then, the process proceeds to step B100, where all the “H” selection signals U1, U2, V1, V2, W1, W2 are output, and then the process returns. I have. The control operation of the microcomputer 59 described above is the operation of the motor driving program when the start flag is in the “L” state, whereby the energization of the brushless motor 20 is controlled by the sine wave voltage. Hereinafter, a specific operation when the brushless motor 20 is driven to rotate forward by the above control operation will be described with reference to a time chart shown in FIG.

First, FIG. 20F shows the voltage phase Pv calculated by executing the step B50 of the second interrupt processing (FIG. 18). This voltage phase Pv is a voltage phase advanced from the electrical angle counter EC by the phase command Pc obtained in step B40 of the second interrupt processing (FIG. 18). Then, the output waveform data Du output by executing step B70 of the second interrupt processing (FIG. 18) becomes data as shown in FIG. 20 (g).

When the output waveform data Du is output,
The U-phase comparator 62 in the control means 67 compares the output waveform data Du with the carrier Pz output from the triangular wave generation circuit 65 and outputs a signal Vu. Then, the selection circuit 66 outputs drive signals Vup and Vun based on the signal Vu and the selection signals U1 and U2. In this case, since the selection signal U1 = “H” and the selection signal U2 = “H”, the selection circuit 66 sets the drive signal Vup = the signals Vu, V
un = drive signals Vup and Vu which are inverted signals of signal Vu
Output n. These drive signals Vup and Vun are shown in FIG.
(H). Although not shown in FIG. 20, V
Also, the output waveform data D is obtained by executing steps B80 and B90 of the second interrupt processing (FIG. 18) for the phase and the W phase.
v and Dw are output and drive signals Vvp, Vvn, Vwp and Vwn are output from the selection circuit 66.

In this case, the V-phase output waveform data Dv and the drive signals Vvp, Vvn are the U-phase output waveform data Du,
The phase is delayed by “128” in electrical angle from the drive signals Vup and Vun. Also, the output waveform data D of the W phase
w, the drive signals Vwp, Vwn are “25” in electrical angle more than the U-phase output waveform data Du, the drive signals Vup, Vun.
The phase is delayed by 6 ".

Then, the U-phase drive signals Vup, Vu
By turning on / off the switching elements 54a and 54b of the inverter main circuit 47 through the drive circuits 57a and 57b by n, the voltage output from the U-phase output terminal of the inverter main circuit 47 is shown in FIG. Such a voltage waveform is obtained. This U-phase output voltage has a sine wave waveform of P
This is a voltage subjected to WM processing (that is, a PWM voltage approximated by a sine wave). When the U-phase output voltage is applied to the U-phase winding 26u of the brushless motor 20, the current flowing through the U-phase winding 26u has a current waveform as shown in FIG.

The phase of the winding current flowing through U-phase winding 26u is determined by the induced voltage generated in U-phase winding 26u (FIG. 20).
It almost coincides with the phase of (a). This is because the phase command Pc (see FIG. 10) formed in step M110 of the main process (FIG. 15) is
This is because the data is obtained by an experiment in advance so that the current flowing through the winding 26 of each phase during the operation of 0 has the same phase as the induced voltage of each phase.

Also, for the V phase and the W phase, the drive signal V
By turning on and off the switching elements 54c to 54f of the inverter main circuit 47 by vp, Vvn, Vwp, and Vwn, the voltage output from the V-phase and W-phase output terminals of the inverter main circuit 47 is equal to the U-phase output voltage. Similarly, the voltage is obtained by performing PWM processing on the sine wave waveform. Then, these V-phase and W-phase output voltages are
When the V-phase and W-phase windings 26v, 26w are energized, the phases of the currents flowing through the windings 26v, 26w are
26w almost coincides with the phase of the induced voltage.

The operation described above is based on the brushless motor 2
The operation in the case of driving 0 in the forward rotation direction is almost the same as the operation in the case of driving in the reverse rotation direction. In the case of driving in the reverse rotation direction, the table of the position sensor signal mode of FIG. 11, the electrical angle data table of FIG.
The only difference is that each data table for reverse rotation is used as the third rectangular wave data table. Until the washing operation is completed (that is, until the process proceeds to “YES” in step M120 of the main process (FIG. 15)), the above-described operation of driving the brushless motor 20 in the normal and reverse rotations is repeatedly executed. ing.

Next, the control operation of the dehydration operation will be described. When the dehydration operation command is received, the process proceeds to "YES" in step M130 of the main process (FIG. 15), and the drain valve motor 9 is energized (step M140). This allows
The drain valve 7 is opened and the water in the rotary tub 4 is drained, and until the drain in the rotary tub 4 is completed based on the detection signal from the water level sensor 73 that detects the water level in the rotary tub 4. The drain operation is continued (step M150).

When the drain valve motor 9 is energized, the switching lever 33 of the clutch 32 pivots downward, and the lower projection 33e of the switching lever 33 is moved to a plurality of projections on the upper surface of the rotor housing 28. 28d (see FIG. 7)
reference). Thereby, the tank shaft 12 and the rotor 27 (and the stirring shaft 14) are connected so as to rotate integrally.
In the case of this embodiment, the tank shaft 12, the rotary tank 4, the stirring shaft 14, and the stirring body 5 are directly driven to rotate by the brushless motor 20.

Thereafter, when the drainage of the rotary tank 4 is completed,
Proceeding to step M160, one dehydration operation course to be executed from now on is selected from a plurality of dehydration operation courses. Subsequently, steps M170, M180, M190
Are sequentially executed to form an operation pattern (operation command) for the brushless motor 20. In this case, a plurality of dehydration operation patterns are stored in the ROM 59a in advance, and a dehydration operation pattern corresponding to the course selected in Step M160 is selected and read out from the plurality of dehydration operation patterns. In addition, an operation pattern for a dehydration operation (a dehydration operation pattern) is formed. FIG. 14 shows an example of this dehydration operation pattern.

As shown in FIG. 14, the dehydration operation pattern includes a drive command consisting of 2 bits of data, a voltage command Vc consisting of 8 bits of data, and a 9 bit And a phase command Pc composed of data. The dehydration operation pattern shown in FIG. 14 is, for example, an operation pattern composed of “forward rotation drive” for 50 seconds. In the dehydration operation, the operation pattern for 50 seconds is executed. .

Here, the operation pattern for 50 seconds is composed of the three command data sampled at, for example, 1 s (second). That is, assuming that the three command data are one set of data, the 50-second operation pattern is composed of 50 sets of data, and these 50 sets of data are stored in the ROM 59a as the dehydration operation pattern of FIG. I have. Here, the phase command Pc of the dehydration operation pattern in FIG. 14 is such that the phase of the current flowing in each phase of the winding 26 of the brushless motor 20 during operation is ahead of the phase of the induced voltage generated in each phase of the winding 26. Data obtained experimentally so as to be in phase, which will be described later in detail.

Now, steps M170 and M18
0, in reading the dehydration operation pattern from the ROM 59a in step M190, the one set of data, that is, three command data, is sequentially read every second. Then, the three read command data are used as a motor drive command and a motor voltage command V, respectively.
c, a motor phase command Pc, which is used to form a motor drive command, a motor voltage command Vc, and a motor phase command Pc (step M170, step M1).
80, step M190). The processing for forming each of these drive commands is a determination processing of the end of the dehydration operation (step M20).
0), power outage determination processing (step M210), and lid switch determination processing (step M220) are repeatedly executed until “YES” is reached.

The actual energizing drive of the brushless motor 20 in the dehydrating operation is performed in the same manner as in the above-described washing operation.
And the second interrupt processing side of FIG. 18 is executed. The control operation of each of these processes is almost the same as in the case of the washing operation, and the description will be omitted. In this case, in the case of the dehydration operation, the dehydration operation pattern (FIG. 14) is used instead of the washing operation pattern (FIG. 10).
The only difference is the use of.

Next, the operation when the dehydration operation is stopped, that is, when the rotary tub 4 is stopped by braking will be described. First, the operation at the end of the normal dehydration operation will be described. In this case, when the spin-drying operation time reaches the set time set according to the spin-drying operation course, it is determined that the spin-drying operation has ended, and the process proceeds to “YES” in step M200 to execute the normal braking process (step M230). ). here,
The microcomputer 59 outputs a selection signal in which the selection signals U1, V1, W1 are "L" and the selection signals U2, V2, W2 are "H".

Upon receiving these selection signals, the selection circuit 66
It outputs the “L” drive signals Vup, Vvp, Vwp and outputs the “H” drive signals Vun, Vvn, Vwn. Thus, the switching elements 54a, 54c, 54e of the inverter main circuit 47 are turned off, and the switching elements 54b, 54d, 54f are turned on.
As a result, the winding 26 of the brushless motor 20 includes the switching elements 54b, 54d, 54f and the diode 55
A short circuit is formed through b, 55d, and 55f, and a braking torque is generated. Due to this braking torque, the rotation of the brushless motor 20 and, consequently, the rotating tub 4 is stopped. The normal braking process is configured to be executed for a predetermined set time, and thereafter, the process returns to step M20.

On the other hand, if a power failure occurs during the dehydration operation,
Alternatively, when the lid 74 is opened, a process of urgently braking the rotary tub 4 (steps M240 to M280) is executed. The emergency braking process will be described below. First, when it is determined that a power failure has occurred based on the detection signal from the power failure detection circuit 72, the process proceeds to "YES" in Step 210, and Step M240 is executed. If it is determined that the lid 74 has been opened based on the switch signal from the lid switch 75, the process proceeds to step 2
The process proceeds to “YES” at 20, and Step M240 is executed.

In step 240, the microcomputer 59 outputs a relay off signal to the relay drive circuit 70 to turn off the relay 48. Subsequently, step M25
0 to form a motor phase command Pc for emergency braking. In this case, a delay phase such as "-16" is formed as the emergency braking motor phase command Pc. Then, the process proceeds to Step M260 to form an emergency braking motor voltage command Vc (a voltage command having a predetermined value). The processing for forming the motor phase command Pc and the motor voltage command Vc for emergency braking is performed by the brushless motor 2.
It is configured to be repeatedly executed until the rotation speed (the number of rotations) of 0 is reduced to the set speed for the speed reduction determination.

Here, the motor phase command P
When the brushless motor 20 is energized and driven in step c, the brushless motor 20 enters a regenerative state, that is, a state in which regenerative braking occurs. Due to this regenerative braking, the rotation of the brushless motor 20 and, consequently, the rotation of the rotary tank 4 is reduced. Also, the regenerative power generated in the winding 26 of the brushless motor 20 is
The current flows to the DC power supply circuit 43 via the diodes 55a to 55f of the inverter main circuit 47. And
This regenerative current passes through the diode 49 and charges the capacitors 42a and 42b of the DC power supply circuit 43 to increase the DC voltage. In this case, even if a power failure occurs, the constant voltage circuit 45 operates by the regenerative power to supply a constant voltage to the microcomputer 59, so that the control operation of the microcomputer 59 is continued.

Further, in the above configuration, the microcomputer 59 controls the capacitor 42 of the DC power supply circuit 43 through the voltage dividing circuit 69.
The magnitudes of the charging voltages a and 42b, that is, the magnitude of the DC voltage are detected, for example, every 1 ms. And the microcomputer 59
When the detected DC voltage exceeds, for example, 400 V, an ON signal is output to the drive circuit 52 of the discharging means 53 to turn on the switching element 51. As a result, the regenerative current is consumed by the discharge resistor 50 of the discharging means 53.
The increase in the DC voltage of 2b is suppressed. The microcomputer 5
Reference numeral 9 is configured to output an off signal to the drive circuit 52 of the discharging means 53 to turn off the switching element 51 when the detected DC voltage becomes, for example, 350 V or less.

By the regenerative braking, the brushless motor 2
When the rotation speed of 0 is reduced to the set speed for the speed reduction determination, the process proceeds to “YES” in step M270. In this case, the rotation speed of the brushless motor 20 is configured to be detected based on the rotation period Tm obtained in step A70 of the first interrupt processing (FIG. 17). Specifically, when it is determined that the rotation cycle Tm has become longer than the set value for speed reduction determination (rotation speed has been reduced), the process proceeds to “YES” in step M270.
After that, the normal braking process is performed in the same manner as in step M230 described above. This allows
The rotation of the brushless motor 20 and consequently the rotation of the rotary tank 4 is stopped. The normal braking process is performed for a predetermined set time, and thereafter, the process returns to step M20.

Incidentally, in the fully automatic washing machine having the above configuration,
The washing operation and the dehydration operation of the set washing operation course can be executed by appropriately combining and executing the above-described washing operation and dehydration operation. In this case, when the washing operation and the dehydration operation are performed in each step, a pattern corresponding to each step and the course (the pattern most suitable for each step and the course) is used as the washing operation pattern and the dehydration operation pattern. Has become.

According to the present embodiment having such a configuration, during the washing operation, the switching lever 33 of the clutch 32 is rotated upward and the stirring shaft 14, that is, the stirring body 5 is rotated by the rotor 27 of the brushless motor 20. It is directly driven forward and reverse. During the spin-drying operation, the switching lever 33 of the clutch 32 is rotated downward, and the rotor 27 of the brushless motor 20 directs the stirring shaft 14 and the tank shaft 12, that is, both the stirring body 5 and the rotary tank 4, directly. It is driven to rotate at high speed in the direction of rotation. As a result, since a so-called direct drive structure is used, a belt transmission mechanism and a gear reduction mechanism can be dispensed with, and the overall weight and size of the washing machine can be reduced, and operating noise can be reduced. .

In this embodiment, the brushless motor 2
In the case where the motor 0 is energized, a sinusoidal energization signal is generated based on the position sensor signal from the Hall IC 31 and the brushless motor 20 is energized based on the energization signal. It can be made extremely small, and the operating vibration and noise of the brushless motor 20 can be made extremely small. Hereinafter, it will be specifically described that the torque fluctuation is extremely reduced by the current supply control of the brushless motor 20 in the present embodiment.

First, the microcomputer 59 of the inverter device 68
Are three Hall ICs 31u of the brushless motor 20,
By receiving the position sensor signals Hu, Hv, Hw from 31v, 31w, one electric cycle is set to 48
7 and the microcomputer 59 detects the position of the RO in accordance with the detected rotor position.
Read the sine wave waveform data stored in M59a,
The sine wave voltage waveform data corresponding to the rotor position is formed. Then, the voltage waveform data is subjected to pulse width modulation, and then the driving circuits 57a to 57f and the inverter main circuit 4
7 to be supplied to the winding 26. In this case, the phase of the voltage waveform data with respect to the rotor position is controlled as described below.

First, in the case of the washing operation, the respective induced voltages generated in the three-phase windings 26 of the brushless motor 20 and the respective winding currents flowing through the three-phase windings 26 are determined by the washing operation pattern (FIG. 10). Phase command Pc so as to be in phase
Is formed. With this energization control,
A torque as shown in FIGS. 21A and 21B is generated in the brushless motor 20. FIGS. 21A and 21B show the simulation results of the torque waveform. In this case, the brushless motor 20 has three phases and 24 poles, and the winding 2
6 is 50 mH, 10Ω, the rotation speed (rotation speed) N is 150 rpm, the induced voltage is 40 V sin θ, the voltage command Vc is “255”, and the phase command Pc is “3”.
2 ".

In FIG. 21A, v (u) represents the U-phase output voltage of the inverter main circuit 47. This U-phase output voltage is actually a complicated waveform subjected to PWM processing, but is approximated to a sine wave waveform and is shown as an analog voltage (AC voltage). Also, e
(U) indicates an induced voltage generated in the U-phase winding 26u,
i (u) indicates a winding current flowing through the U-phase winding 26u.

Then, in FIG. 21 (b), T (u)
Indicates a torque waveform for the U phase, and T indicates a torque waveform for the three phases. Here, T (U) and T are calculated by the following equations, respectively. N is the number of rotations.

T (u) = (i (u) × e (u)) / (2
× π × N / 60) T = (i (u) × e (u) + i (v) × e (v) + i
(W) × e (w)) / (2 × π × N / 60) According to FIG. 21 (a), current is applied in phase with the induced voltage, that is, the induced voltage and the winding Since the power factor with the current is maximum, it is understood that the motor efficiency of the brushless motor 20 is maximum. FIG.
According to (b), since the torque waveform T for three phases is a straight line, a torque without fluctuation is generated, that is,
It can be seen that there is almost no torque fluctuation. This allows
During the washing operation, the operation vibration and operation noise of the brushless motor 20 are extremely small.

On the other hand, in the case of the dehydration operation, each current flowing through the three-phase windings 26 is different from each induced voltage generated in the three-phase windings 26 of the brushless motor 20 by the dehydration operation pattern (FIG. 14). The configuration is such that the phase command Pc is formed such that the phase is advanced. By this energization control, a torque as shown in FIGS. 22A and 22B is generated in the brushless motor 20. Note that FIGS. 22 (a) and 22 (b)
Also shows the simulation result of the torque waveform, and v (u), e (u), i (u), T in FIG.
The definitions of (u) and T are the same as the definitions of FIG. In this case, the brushless motor 20 is
The winding 26 is 50 mH, 10Ω, the rotation speed (rotation speed) N is 900 rpm, and the induced voltage is 24
0V sin θ, the voltage command Vc is “255”, and the phase command Pc is “64”.

FIG. 22A shows that a positive torque is generated while the induced voltage is higher than the output voltage of the inverter main circuit 47. This indicates that the rotation speed (rotation speed) of the brushless motor 20 can be forcibly increased. This will be described with reference to the torque-rotation speed characteristic diagram of FIG.

In FIG. 23, the characteristic A is a normal characteristic of the brushless motor 20. In this case, the rotation speed of the brushless motor 20 is limited so that the induced voltage does not exceed the output voltage of the inverter main circuit 47. It is configured as follows. On the other hand, when the energization control is performed so that the winding current has a leading phase with respect to the induced voltage, B
It becomes the characteristic shown by. When the winding current is controlled so as to have a further advanced phase, the characteristic indicated by C in FIG. 23 is obtained.

Here, when the load point during the washing operation is indicated by X in FIG. 23, the characteristic A is a characteristic that maximizes the motor efficiency at the washing load point X, and the brushless motor 20 has such a characteristic A. It can be seen that the motor is provided. On the other hand, the load point at the time of the dehydration operation is a region indicated by Y in FIG. On the other hand, in this embodiment, the configuration is such that the characteristic C is obtained by controlling the energization so that the winding current has a leading phase with respect to the induced voltage, so that the brushless motor 20 having the characteristic A is dehydrated. It is possible to drive at the load point Y.

Furthermore, in the above embodiment, when the brushless motor 20 is energized and driven with the characteristic C, the torque waveform T for three phases is a straight line as shown in FIG. It can be seen that no torque is generated, that is, there is almost no torque fluctuation. As a result, the operation vibration and operation noise of the brushless motor 20 during the dehydration operation are extremely reduced.

Next, during the spin-drying operation, the brushless motor 2
A case where emergency braking is performed on 0 (and the rotating tank 4) will be described. In this case, the phase command Pc is formed so that the winding current has a lag phase with respect to the induced voltage. By this energization control, the brushless motor 20
Torques as shown in FIGS. 24A and 24B are generated.
24 (a) and 24 (b) also show the simulation results of the torque waveform, and v (u),
The definitions of e (u), i (u), T (u), and T are the same as the definitions in FIG. In this case, the brushless motor 20 has three phases and 24 poles, and the winding 26 has a length of 50 m.
H, 10Ω, and the number of rotations (rotational speed) N is 900 rpm
m, the induced voltage is 240 V sin θ, the voltage command Vc is “255”, and the phase command Pc is “−16”.

According to FIG. 24 (b), since the torque waveforms T for the three phases are linear, it can be seen that torque with no fluctuation is generated, that is, there is almost no torque fluctuation. . Moreover, since the torque waveform T is a negative torque, it can be seen that a braking torque is generated. Thereby, at the time of emergency braking during the spin-drying operation, the operation vibration and operation noise of the brushless motor 20 become extremely small.

FIGS. 25 to 30 show a second embodiment of the present invention. The difference of the second embodiment from the first embodiment is that the control contents of the microcomputer 59, specifically, the control contents of the first interrupt processing and the second interrupt processing are different. Note that the same steps in the flowchart (FIGS. 17 and 18) of the first embodiment are denoted by the same step numbers.

First, in the first interrupt processing, as shown in the flowchart of FIG.
A42, A71, A150, and A160 are processes different from those in the first embodiment. Here, for convenience of explanation, the processing from step A71 will be described. In this step A71, a rotation period area ZT is calculated. The rotation cycle area ZT is data calculated by the following equation based on the rotation cycle Tm obtained in step A70 and according to the rotation cycle area data table shown in FIG. 27 stored in the ROM 59a. The rotation cycle area data table,
It is a data table for dividing a rotation period into eight.

If the rotation period Tm <TmH (ZT), ZT = ZT + 1 if the rotation period Tm> TmH (ZT), then ZT = ZT-1, where 0 ≦ ZT ≦ 7 and the first interrupt executed next time In processing
When step A41 is executed, a multiplication factor is selected based on the previously calculated rotation cycle region ZT. Specifically, from the multiplication rate data table of FIG. 28 stored in the ROM 59a, the number of shifts and the electrical angle increase data Ed are obtained.
(This Ed is data used in step B20 of the second interrupt processing (FIG. 26)). Then, a process of shifting the data DT1 in the decreasing direction by the selected number of shifts is performed.
Hereinafter, a description will be given by applying specific numerical values to each data.

For example, when the rotation period area ZT is “6”, the number of shifts is “0” and the electrical angle increase data Ed is “8” from the multiplication rate data table of FIG.
Is selected. In this case, the shift processing is not performed, and the multiplication rate is 8 times as in the first embodiment.

Next, when the rotation period area ZT is “3”, for example, the number of shifts is “1” from the data table of FIG.
Is selected. In this case, a process of shifting the data DT1 once is executed, and the data DT1 is reduced to half. This is equivalent to changing the cycle of the clock ck1 twice. Then, in step A50, when the shifted data DT1 (1/2 data DT1) is given to the second counter 61, the second counter 6
1 operation cycle is 1/1 of the operation cycle of the first counter 60
It becomes 6. Thereby, the second interrupt processing (FIG. 26)
Is executed 16 times during one mode. That is, the multiplication rate becomes 16 times. In addition, the electrical angle increase data E
Since d is "4", the second interrupt processing (FIG. 26)
In the process of step B20, the electrical angle counter EC increases by "4", and the calculation of the output data waveforms (Du, Dv, Dw) is executed in response to this increase. Thereby, an output data waveform with higher resolution can be obtained.

Then, following the execution of the processing of step A41, the processing of step A42 is executed to perform the position sensor correction processing. In this position sensor correction processing, the data DT2 is calculated by the following equation with reference to the electrical angle data table shown in FIG. 12 and the calculated data DT2 is output to the second counter 61.

DT2 = DT1 × 64 / (Ex (n) -E
x (n-1)) However, when (Ex (n) -Ex (n-1)) is negative, 384 is added to this and the calculation is executed.

In this case, step A160 described later is used.
Until the electrical angle data is rewritten in the processing of (3), "Ex (n) -Ex (n-1) = 64", so that "DT2 = DT1".

Thereafter, in step A140, it is determined whether or not the rotation state of the brushless motor 20 is in a stable state. In this case, step A70
Is determined based on whether or not the difference between the two rotation periods Tm and Tmp obtained in is within a predetermined range. Then, when it is determined that the difference between the rotation periods Tm and Tmp is within a predetermined range and the state is a stable state, step A1
Proceeding to "YES" at 40, calculation processing (step A150) represented by the following equation is performed.

Ex (1) = 32 Ex (n) = Ex (n−1) + 64 × Ts (n−1) /
(Tm / 6) Subsequently, the process proceeds to step A160, and the electrical angle data table is rewritten based on the calculation result. Thereafter, the process of step A42 is executed using the rewritten electric angle data table.

Next, the above-described first interrupt processing (FIG. 2)
The control operation of steps A42 to A160 of 5), that is, the control operation of the position sensor correction processing will be specifically described with reference to FIG. In FIG. 30, a position sensor signal H is generated due to a mounting error of the V-phase Hall IC 31v.
The position sensor signal Hv among u, Hv, and Hw (see FIG. 30B) is shifted in the delay direction.

In this state, the first interrupt processing (FIG. 2)
By performing step A20 of 5), a change period Ts (n) is obtained, and this change period Ts (n) is assumed to be data as shown in FIG. In this case, in step A150, the electrical angle data Ex
(N) is calculated as follows.

Ex (1) = 32 Ex (2) = 32 + 64 × 8000/8000 = 96 Ex (3) = 96 + 64 × 9000/8000 = 168 Ex (4) = 168 + 64 × 7000/8000 = 224 Ex (5) = 224 + 64 × 8000/8000 = 288 Ex (6) = 288 + 64 × 9000/8000 = 360 Based on these calculation results, the electrical angle data table shown in FIG. 12 is rewritten into the electrical angle data table shown in FIG.

Thereafter, when the data DT2 is calculated in the process of step A42, for example, when the data DT2 is calculated at the rising timing of the position sensor signal Hv, it is obtained by the following equation. Step A
In the shift processing in 41, the number of shifts is assumed to be “0”. DT1 = 9000.

DT2 = 9000 × 64 / (168−96) = 8000 The calculated data DT2 is output to the second counter 61. Therefore, the count operation of the first counter 60 is as shown in FIG. 30 (f), and the count operation of the second counter 61 is as shown in FIG. 30 (g).

In the rewriting process of the electric angle counter EC in step A60, the electric angle data table shown in FIG. 29 is used. Thus, the counting operation of the electrical angle counter EC is as shown in FIG. FIG. 30H shows that the position detection of the rotor 27 can be continuously performed without distortion. That is, even if the position sensor signal Hv is deviated due to the mounting error of the V-phase Hall IC 31v by the above-described position sensor correction processing, the deviation can be detected and the position sensor signal can be corrected. It can be seen that the position detection was correctly performed. in this case,
The position sensor signal can be similarly corrected when there is an error in mounting the Hall IC 31 of another phase.

Next, the second interrupt processing of the second embodiment will be described with reference to FIG. In the second interrupt process (FIG. 26), steps B10 to B60 are the same as the second interrupt process (FIG. 18) of the first embodiment, and a description thereof will be omitted. In the second embodiment, after reading the voltage command Vc in step B60, the process proceeds to step B61, in which a process of inputting the DC power supply voltage of the DC power supply circuit 43 is performed. Here, the microcomputer 59
Receives a voltage signal obtained by dividing the DC power supply voltage of the DC power supply circuit 43 into, for example, 5/512 by a voltage dividing circuit 69, and performs digital voltage data such as 8-bit data Vs by an A / D conversion function incorporating the voltage signal. It is configured to convert and input.

Then, the process proceeds to a step B71, in which the voltage ratio Ds of the sine waveform corresponding to the calculated voltage phase Pv is read from the energization waveform data shown in FIG. 9, and the output waveform data Du is calculated by the following equation. Ask.

Du = Ds × (Vc / 256) × (Vr /
Vs) +128 In this equation, the difference from the equation for calculating the output waveform data Du in the first embodiment is that (Vr / Vs) is
It is a point that is multiplied by Here, Vr is 8-bit data corresponding to a reference DC power supply voltage of, for example, 180 V,
Specifically, it is “90”. In this case, assuming that the DC power supply voltage fluctuates in a range of, for example, 200 V to 220 V, (Vr / Vs) is (90/100) to (90/100).
/ 110) is multiplied by a value fluctuating in the range of / 110) to calculate output waveform data Du.

Then, the process proceeds to a step B81, wherein the voltage phase Pv is calculated by the following equation, and the output waveform data Dv
Is calculated by the following equation.

Pv = EC + Pc + 256 If Pv ≧ 384, Pv = Pv−384.

Dv = Ds × (Vc / 256) × (Vr /
Vs) +128 Then, the process proceeds to Step B91, and the voltage phase P
v is calculated by the following equation, and the output waveform data Dw is calculated by the following equation.

Pv = EC + Pc + 128 However, when Pv ≧ 384, Pv = Pv−384.

Dw = Ds × (Vc / 256) × (Vr /
Vs) +128 By executing the processing of steps B61 to B91 described above,
Even if the DC power supply voltage fluctuates, the output waveform data Du, Dv, and Dw are calculated in accordance with the fluctuation, so that the output waveform data Du, which is not affected by the fluctuation,
Dv and Dw can be output. This allows the brushless motor 20 to be driven irrespective of the DC power supply voltage fluctuation.
Can be controlled accurately. Note that the second
In the case of the embodiment, the microcomputer 59 includes a multiplied signal generating unit, a rotor position estimating unit, a rotation stability determining unit,
It has various functions as electric angle data calculation means and correction means.

In each of the above embodiments, the user operates the various operation switches on the operation panel to select a desired washing operation course. However, the present invention is not limited to this. Means may be provided for detecting the amount and quality of the laundry at the time of the initial operation of the operation, and an optimum washing operation course may be automatically selected based on the detection result by the detecting means.

In each of the above embodiments, the brushless motor 20 is switched to the sine wave current after a predetermined time has elapsed after the rectangular wave current is applied to the brushless motor 20 at the time of starting. It may be configured to switch to the sine wave energization when the set rotation speed (or the rotation cycle is increased to the set rotation cycle). The specific values of the predetermined time, the set speed, and the set rotation period may be appropriately determined.

On the other hand, in each of the above embodiments, the microcomputer 59,
Although the counters 60 and 61, the comparators 62, 63 and 64, the triangular wave generation circuit 65 and the selection circuit 66 are configured as separate circuits, instead of this, instead of the third embodiment shown in FIG. The microcomputer 59 and the counters 60 and 6 of the first embodiment
1, a one-chip microcomputer (one-chip microcomputer) 78 including all of the comparators 62, 63, 64, the triangular wave generation circuit 65, and the selection circuit 66 may be provided.

Furthermore, in each of the above embodiments, when the brushless motor 20 (rotary tub 4) is subjected to emergency braking, the voltage command Vc
And the phase command Pc is a predetermined value. However, the present invention is not limited to this. The voltage command Vc and the phase command Pc are configured to be variable based on the rotation cycle detection result and the elapsed time. Is also good. Furthermore, in each of the above embodiments, the sine wave waveform data is stored in the ROM 59a as the energization waveform data. However, the present invention is not limited to this, and the energization waveform that can prevent (small) the torque fluctuation of the brushless motor 20 is provided. In this case, another waveform data may be stored.

In the second embodiment, the rewritten electric angle data is stored in a non-volatile memory such as an EEPROM, and is stored in the non-volatile memory as electric angle data at the next power-on. The electric angle data may be used. Furthermore, the second
In the embodiment of the present invention, the processes of the determination of the stable rotation state, the calculation of the electrical angle data, and the rewriting of the electrical angle data are performed only one time after the power is turned on (or only during the initial operation of the washing operation).
It may be configured to execute. Furthermore, the processes of determining the stable rotation state, calculating the electrical angle data, and rewriting the electrical angle data are executed in the final stage of the manufacturing process of the washing machine, and the data obtained in each process is stored in a nonvolatile memory such as an EEPROM. , And then the product may be shipped.

[0161]

Since the present invention is as described above, the following effects can be obtained.

According to the first aspect of the present invention, at least one of the agitating section and the rotary tub is driven to rotate by the direct drive system by the brushless motor, so that generation of gear noise can be eliminated. Since the brushless motor is configured to conduct a sine wave, torque fluctuation can be almost eliminated. As a result, the operation vibration and operation noise of the brushless motor can be significantly reduced, and a fully automatic washing machine with extremely low vibration and low noise can be realized.

According to the second aspect of the present invention, the energization signal is formed by reading the energization waveform data from the storage means in accordance with the electrical angle from the electrical angle detection means, and the brushless motor is formed based on the energization signal. Since the energization control is performed, the energization waveform data that minimizes the torque fluctuation is stored in the storage means, so that the occurrence of the torque fluctuation can be extremely reduced. by this,
As in the configuration of the first aspect, the operation vibration and operation noise of the brushless motor can be significantly reduced.

According to a third aspect of the present invention, there is provided a washing machine comprising: a phase command forming means for forming a phase command; and a voltage command forming means for forming a voltage command. The electrical angle of the energization waveform is determined based on the phase command from the means, and the energization signal is formed based on the energization waveform data from the storage means and the voltage command from the voltage command forming means in accordance with the electrical angle. As a result, the brushless motor 20 can be energized in the most appropriate energizing pattern during the washing operation, the dehydrating operation, and the braking operation. As a result, the motor current can be reduced and the braking force can be increased.

According to the fourth aspect of the present invention, the washing machine further comprises voltage detecting means for detecting the voltage of the DC power supply, and detects the electric angle from the electric angle detecting means and the phase command from the phase command forming means. The electrical angle of the energization waveform is determined by applying the energization signal based on the energization waveform data from the storage unit, the voltage command from the voltage command forming unit, and the DC power supply voltage from the voltage detection unit. With this configuration, even if the DC power supply voltage fluctuates, it is possible to form an energization signal that corrects this fluctuation, and it is possible to energize the brushless motor with a highly accurate energization waveform. . In addition, in the case of this configuration, since the capacity of the capacitor of the DC power supply circuit can be reduced, the inverter device can be reduced in size and cost.

According to the fifth aspect of the present invention, the energization waveform data stored in the storage means is energization waveform data having a substantially sinusoidal waveform, so that the torque fluctuation generated in the brushless motor can be greatly reduced. it can.

According to the washing machine of claim 6 or 7,
During the washing operation, the same phase current is applied to the induced voltage generated in the windings of each phase of the brushless motor. be able to. In addition, since the power consumption can be reduced, the heat generation of the brushless motor and the inverter device can be reduced, and the configuration for heat generation can be simplified. Furthermore, in the case of this configuration, the phase adjustment of the energizing current is performed according to the phase command pattern obtained experimentally, so that the phase adjustment can be performed without using a detection configuration for detecting the winding current. realizable. Therefore, the size and cost of the inverter device can be reduced.

[0168] According to the washing machine of claim 8 or 9,
During the spin-drying operation, the brushless motor is configured to conduct the leading phase with respect to the induced voltage generated in each phase winding, so that the brushless motor with a low rotation speed specification is driven at a high rotation speed, that is, A dehydration operation can be performed by the brushless motor. In this configuration, the motor current during the washing operation can be reduced, so that the capacity of the components of the inverter device can be reduced, and the size and cost of the inverter device can be reduced.

According to the washing machine of the tenth aspect, during the braking operation, the phase difference is applied to the induced voltage generated in the winding of each phase of the brushless motor, so that the torque fluctuation is remarkably reduced. It is possible to increase the braking force while making it smaller. Therefore, when the lid is opened during high-speed rotation (during spin-drying operation), the brushless motor can be stopped in a short time, and a mechanical brake device may not be required. Therefore, the operation sound of the mechanical brake device is not generated, and the configuration of the washing machine can be downsized by the absence of the mechanical brake device.

According to the eleventh or twelfth aspect of the present invention, the washing machine further comprises a rotor position detecting means for outputting a signal having a predetermined phase relationship with an induced voltage generated in the winding as the position sensor signal. Is provided with electrical angle detecting means for detecting the electrical angle of the rotor at a cycle shorter than the change cycle of the rotor. For example, the electrical angle of the rotor, Can be detected with high resolution. For this reason, since a position sensor with high resolution can be dispensed with, manufacturing cost can be reduced and reliability against water and dust can be increased.

According to the thirteenth aspect of the present invention, the multiplication rate of the multiplication signal is changed based on the rotation cycle of the brushless motor. Can be configured not to increase the frequency of occurrence of interrupt processing. Thus, a microcomputer having a low processing speed can be used. As a result, the reliability of the inverter device can be improved, and the cost of the inverter device can be reduced.

According to the fourteenth to sixteenth aspects, when the rotation stability determination means determines that the rotation is stable, the electrical angle data of the rotor corresponding to the change in the position sensor signal is obtained by calculation. The result of this operation is stored,
Since the rotor position is estimated at a cycle shorter than the change cycle of the position sensor signal based on the stored electrical angle data, the displacement of the position sensor signal can be automatically detected and corrected. As a result, the brushless motor can be energized and driven with a highly accurate energization waveform while using an inexpensive position sensor having a low mounting position accuracy as the rotor position detection means. Therefore, the reliability of the position sensor can be improved, and the number of poles of the brushless motor can be increased.

According to the seventeenth aspect of the present invention, the rectangular wave voltage formed by performing a logical operation on the position sensor signal is supplied to the brushless motor to start the motor, and then the brushless motor is started. Since the supply voltage is switched so that the voltage based on the voltage is supplied to the brushless motor to drive the brushless motor, the brushless motor can be started smoothly.

According to the eighteenth aspect of the present invention, since the electrical angle detecting means, the storing means, and the energizing signal forming means are constituted by a one-chip microcomputer, the downsizing and cost reduction of the inverter device can be more easily realized. can do.

[Brief description of the drawings]

FIG. 1 is an electrical configuration diagram of a fully automatic washing machine showing a first embodiment of the present invention.

FIG. 2 is a vertical side view of a fully automatic washing machine.

FIG. 3 is a vertical sectional side view of a driving mechanism of a stirring body and a rotary tank.

FIG. 4 is an exploded perspective view of a stator of the brushless motor.

FIG. 5 is an exploded perspective view of a brushless motor and a clutch.

FIG. 6 is a perspective view of a clutch and a control lever.

FIG. 7 is a diagram corresponding to FIG. 3, showing different switching states of the clutch.

FIG. 8 is an electrical configuration diagram of a selection circuit.

FIG. 9 is a diagram showing energization waveform data.

FIG. 10 shows an example of a washing operation pattern.

FIG. 11 is a diagram showing determination data in a position sensor signal mode.

FIG. 12 is a diagram showing an electrical angle data table.

FIG. 13 is a diagram showing a rectangular wave data table;

FIG. 14 is a diagram showing an example of a dehydration operation pattern.

FIG. 15 is a flowchart of a main process.

FIG. 16 is a flowchart of a main process for driving a motor.

FIG. 17 is a flowchart of a first interrupt process;

FIG. 18 is a flowchart of a second interrupt process.

FIG. 19: When the brushless motor is started (when the rectangular wave is energized)
Time chart

FIG. 20 is a time chart when a sine wave is supplied to the brushless motor.

FIG. 21 is a diagram for explaining a torque waveform of a brushless motor during a washing operation.

FIG. 22 is a diagram for explaining a torque waveform of a brushless motor during a spin-drying operation.

FIG. 23 is a characteristic diagram showing torque-rotation speed characteristics of a brushless motor.

FIG. 24 is a diagram for explaining a torque waveform of the brushless motor during emergency braking.

FIG. 25 is a flowchart of a first interrupt process according to the second embodiment of the present invention;

FIG. 26 is a flowchart of a second interrupt process;

FIG. 27 is a diagram showing a data table for determining a rotation speed region.

FIG. 28 is a view showing a data table for determining a multiplication rate;

FIG. 29 shows an electrical angle data table.

FIG. 30 is a time chart.

FIG. 31 is an electrical configuration diagram of a microcomputer according to a third embodiment of the present invention.

[Explanation of symbols]

1 is an outer box, 2 is a water receiving tank (outer tank), 4 is a rotating tank, 5 is a stirring body, 6 is a drain port, 7 is a drain valve, 9 is a drain valve motor, 12
Is a tank shaft, 14 is a stirring shaft, 20 is a brushless motor, 21
Is a stator, 26 is a winding, 27 is a rotor, 30 is a rotor magnet, 31 is a Hall IC (rotor position detecting means), 32 is a clutch, 33 is a switching lever, 38 is a control lever, 42a and 42b are smoothing capacitors, 43 Is a DC power supply circuit, 46 is a discharge circuit, 47 is an inverter main circuit,
48 is a relay, 50 is a discharge resistor, 51 is a switching element, 53 is discharge means, 54a to 54f are switching elements, 55a to 55f are freewheel diodes, 57
a to 57f are drive circuits, 58 is a motor energizing means, 59 is a microcomputer (electric angle detecting means, storage means, phase command forming means, voltage command forming means), 59a is RO
M and 59b are RAMs, 60 is a first counter, 61 is a second counter, 62, 63, and 64 are comparators, 65 is a triangular wave generation circuit, 66 is a selection circuit, and 67 is control means (energization signal forming means). , 68 is an inverter device, 70 is a relay drive circuit, 72 is a power failure detection circuit, 74 is a lid, and 78 is a microcomputer.

Claims (1)

[Claims] 1. A rotary tub rotatably provided in an outer tub, a stirring unit rotatably provided in the rotary tub, and at least one of the stirring unit and the rotary tub is directly driven. A brushless motor that is rotationally driven by a method, a rotor position detecting means that detects a rotational position of a rotor of the brushless motor and outputs a position sensor signal, and a substantially sinusoidal waveform based on the position sensor signal from the rotor position detecting means. A washing machine comprising: an energization signal forming unit that generates an energization signal; and a motor energization unit that energizes the brushless motor based on the energization signal from the energization signal generation unit.