JPH11252969A - Electric washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric washing machine which operates with high stability by eliminating excess and deficiency of its functions due to operational variance in respective strokes of washing, rinsing, and spin-drying. SOLUTION: In a control means 6 for controlling the operation of a motor 1, when an operating mode command part 7 issues commands, in response to the setting of an operation part 22, an operating sequence corresponding to respective strokes of washing, rinsing, and spin-drying, a computing means 8 outputs the sum of the value obtained by multiplying the output signal of an error detecting means 13 by a first coefficient (a) and the value obtained by multiplying the integral value of the output signal by a second coefficient (b), to a continuity ratio setting means 10. An appropriate continuity ratio is set for respective strokes by setting the first coefficient (a) and the second coefficient (b) for respective strokes. Thus, it is possible to conduct control for stable operation without excess and deficiency in motor capability at any stroke. The first coefficient (a) and the second coefficient (b) can be set, by using a data table which has been stored previously for respective strokes and operational directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric washing machine used for ordinary households and businesses.

[0002]

2. Description of the Related Art A conventional electric washing machine will be described below. FIG. 7 is a circuit diagram showing an example of a configuration of a conventional electric washing machine. In the figure, the electric motor 1 is not shown,
The stator comprises a stator (not shown) provided with a three-phase winding 2, that is, a first winding having a U terminal, and a V terminal. And a third winding having a W terminal, and the rotor is formed of a ring-shaped two-pole permanent magnet to provide a field. The inverter 3 includes a series circuit of a switching element 4u and a switching element 5u,
A series circuit of a switching element 4v and a switching element 5v, and a switching element 4w and a switching element 5w
And the switching elements 4u to 5
w is configured by connecting an IGBT and a reverse conducting diode in parallel.

A U terminal, a V terminal, and a W terminal are connected to a common connection point of two switching elements in the corresponding series circuit, and the switching elements 4u to 5u.
Depending on the combination of ON and OFF of w, the U terminal, V terminal, and W terminal of the three-phase winding 2 are set to the positive voltage, the zero voltage, and the open
Switch to state. At this time, the switching elements 4u ~
The turning on and off of 5w is controlled by control means 6 constituted by a microcomputer (hereinafter referred to as a microcomputer).

[0004] The control means 6 includes an operation mode command unit 7,
Calculating means 8, triangular wave generating means 9, conduction ratio setting means 10,
Three-phase distribution circuit 11, drive circuit 12, error detection means 13,
A comparison circuit 14 and a speed detection unit 15 are provided. The comparison circuit 14 is composed of, for example, a comparator. The comparison circuit 14 compares an output signal of the triangular wave generation unit 9 with an output signal of the conduction ratio setting unit 10, and outputs a triangular wave Switching elements 4u to 5w at the frequency of the triangular wave signal output from generation means 9
Output an on / off signal. Also, for example, Hall IC
16u, the Hall IC 16v and the Hall IC 16w constitute a position detecting means, and the relative position of the rotor with respect to the stator is detected by the high and low of the signals of the three Hall ICs.

[0005] The three-phase distribution circuit 11 includes Hall ICs 16u to
Switching elements 4u-5 based on the 16w output signal
On / off of w is set, and an on / off signal is output to the drive circuit 12, and the drive circuit 12 turns on / off the switching elements 4u to 5w based on the on / off signal. The speed detecting unit 15 detects the speed of the electric motor 1 by detecting the pulse interval of a signal of one of the three Hall ICs 16u to 16w (here, the Hall IC 16u). Both the error detecting means 13 and the calculating means 8 are configured using a calculating function of a microcomputer and a memory. The diode bridge 17, the choke coil 18, and the smoothing capacitor 19 constitute a rectifying and smoothing circuit 20, which rectifies and smoothes the commercial power supply 21 and supplies power to the inverter 3. The user selects a washing method via the operation unit 22 and transmits the method to the control unit 6. Further, the water supply valve 23, the drain valve 24, and the water supply pump 25 are connected to the operation mode command unit 7, respectively, and are controlled by the control unit 6 together with the electric motor 1.

The operation of the above configuration will be described.
The Hall ICs 16u to 16w are arranged at an electrical angle of 120 degrees apart, and in the case of clockwise rotation, the three-phase distribution circuit 11 receives the signals of the Hall ICs 16u to 16w and drives the driving circuit based on a preset data table. 12 outputs an on / off signal, and the drive circuit 12 turns on / off the switching elements 4 u to 5 w based on the output signal of the three-phase distribution circuit 11. As a result, between the U and V terminals, between the U and W terminals, V-
Voltage is sequentially input between the W terminals, between the V-U terminals, between the W-U terminals, between the W-V terminals, and between the U-V terminals, and supplies a current to the three-phase winding 2. Here, since the rotor provides a field with a permanent magnet, the electric motor 1 continues to generate power according to Fleming's left-hand rule.

The current flowing through one conductor of the three-phase winding 2 is represented by i, the magnetic flux density generated by the permanent magnet of the rotor is represented by b, and the current of the three-phase winding 2 facing the permanent magnet is represented by b. Assuming that the length of the winding conductor is 1 and the generated force is f, f = bi
L, and the generated torque is a value obtained by multiplying f by the number of conductors and the radius.

Here, when the control means 6 controls the relative speed of the rotor with respect to the stator to a predetermined value, the error detecting means 13 determines the difference between the set speed value and the speed detected by the speed detecting means. The calculation is performed, and the result is output to the operation means 8. The calculating means 8 is configured as shown in FIG. 8, and calculates a value obtained by multiplying the output value of the error detecting means 13 by the first coefficient a and an integrated value of the output value of the error detecting means 13 up to the present time. The value of the sum with the value multiplied by the second coefficient b is output to the conduction ratio setting means 10. Note that the error integration method in the conventional example is based on the current output value of the error detection means 13 and the error detection means 13 up to the immediately preceding error value stored in the memory of the microcomputer.
The new value of the sum of the output value and the integral value is overwritten on the memory.

The duty ratio setting means 10 sets a duty ratio setting value in accordance with the output value of the calculating means 8 and outputs it to the comparison circuit 14. The comparing circuit 14 compares the triangular wave signal output by the triangular wave generating means 9 with the output signal of the conduction ratio setting means 10,
An on / off signal is driven by the driving circuit 12 at the frequency of the triangular wave signal
Output to The drive circuit 12 turns on and off the switching elements 4u to 5w by the logical product of the on / off signal and the output signal of the three-phase distribution circuit 11. As a result, the motor 1 accelerates to a predetermined speed with a time constant corresponding to the first coefficient a and the second coefficient b, and stabilizes at the predetermined speed.

By the above control, the washing process, the rinsing process,
In the dehydration process, the electric motor 1 can be driven at a desired speed.

[0011]

In such a conventional electric washing machine, the first coefficient a and the second coefficient a are set despite the load and speed fluctuating during the washing, rinsing and dehydrating steps. Since b and b are fixed to constant values, there is a variation in responsiveness and stability in each stroke. Depending on the stroke, speed unevenness is increased, and acceleration to a predetermined speed is too large, and electric washing is performed. There is a problem that a transient load is imposed on the electric motor and the reduction mechanism that constitute the machine, and a problem that the speed is not stable at a predetermined speed depending on the amount of the laundry, and a desired performance cannot be satisfied depending on a stroke. There was a problem to say.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and enables a control in which responsiveness and stability are maintained in any stroke, and a stable electric washing machine capable of satisfying desired performance in all strokes. The purpose is to provide a machine.

[0013]

According to a first aspect of the present invention, there is provided a stator having a three-phase winding, and a rotor for mutually generating an electromagnetic force with the stator by a current flowing through the three-phase winding. And an inverter for supplying electric power to the three-phase winding, and control means for controlling on / off of a switching element constituting the inverter, wherein the control means includes a triangular wave generating means, a conduction ratio setting means. Speed setting means for setting a relative speed between the stator and the rotor, speed detection means for detecting the relative speed, and an instantaneous value of a difference between an output value of the speed setting means and an output value of the speed detection means. And a calculating means, wherein the calculating means calculates a value obtained by multiplying a value obtained by multiplying an output value of the error detecting means by a first coefficient and a value obtained by integrating the output value of the error detecting means with a second coefficient. The value of the sum with the multiplied value Output, the conduction ratio setting means sets the conduction ratio of the switching element according to the output value of the arithmetic means, and outputs the triangular wave signal output by the triangular wave generation means and the instantaneous value of the output signal of the conduction ratio setting means. Determining the conduction ratio of the switching element by comparing
An electric washing machine using a power generation device that changes at least one of the first coefficient and the second coefficient in accordance with each process such as washing, rinsing, and dehydration.

According to the present invention, a preferable conduction ratio is set for each of the washing, rinsing, and dehydrating steps, so that excess and deficiency in performance due to variations in operation between the steps is eliminated, and the responsiveness and stability of the motor are improved in any of the steps. It is possible to solve problems such as overflow of washing water due to excessive acceleration, insufficient speed to reach the predetermined speed due to insufficient acceleration, and problem of applying excessive load to the electric motor and reduction mechanism that constitute the washing machine. In each process, sufficient ability can be demonstrated.

According to a second aspect of the present invention, the control means includes:
The electric washing machine according to claim 1, wherein the electric washing machine is controlled to change at least one of the first coefficient and the second coefficient according to a washing method.

According to the present invention, it is possible to appropriately cope with various conditions set by a user, and to exhibit a function for high-speed washing under a wide speed range and a wide load range, and for washing easily with a cloth. .

According to a third aspect of the present invention, the control means includes:
2. The electric washing apparatus according to claim 1, further comprising: a cloth amount detecting unit, wherein control is performed to change at least one of the first coefficient and the second coefficient in accordance with the cloth amount detected by the cloth amount detecting unit. Machine.

According to the present invention, it is possible to always ensure an appropriate state regardless of the amount of laundry to be washed, to solve the problem that the required time varies depending on the amount of laundry, and to exert a sufficient washing function. .

According to a fourth aspect of the present invention, the arithmetic means includes:
An electric washing machine according to any one of claims 1 and 2, wherein the integrated value of the output value of the error detection means is kept constant when the electric motor is started.

According to the present invention, the problem of improper conduction ratio setting due to the integral value of the error detection output during inertial rotation at the start-up, particularly at the start-up of the reversal start, is solved, the motor is started stably, and the washing function is provided. Can be stabilized.

[0021]

In the present invention according to the first aspect, the calculating means multiplies the output value of the error detecting means by a first coefficient, but sets the first coefficient to an arbitrary value instead of a fixed value. Make it possible. Further, the integral value of the output value of the error detection means is multiplied by a second coefficient, but the second coefficient can be set to an arbitrary value without being fixed. The first coefficient and the second coefficient, together with the rotation direction and the speed of the electric motor in each step of the washing, are stored in a memory of the microcomputer as a data table in advance with preferable values, and are read out from the memory at the time of calculation. . Note that a means for calculating the first coefficient and the second coefficient by a predetermined arithmetic expression is also possible, and is not limited to the above. For the integration, the accumulated value is updated and stored in the memory.

In the present invention according to claim 2, at least one of the first coefficient and the second coefficient is changed, which is a means corresponding to the fact that the capacity of the memory is limited. In this case, a data table in which one of the coefficients is fixed is used, but the present invention is not limited to fixing one specific coefficient.

In the present invention according to claim 3, the cloth amount detecting means is a means for detecting the amount of the laundry put in the washing tub or the washing and dewatering tub, for example, in a state where the laundry is put in. Or the magnitude of an electrical load, and these are reflected as a conduction ratio set value or an inverter current value. However, it is not limited to these.

In the present invention according to claim 4, the calculating means sets the integral value of the output value of the error detecting means to a predetermined value, which means a forced setting, and the output value from the error detecting means is set to a predetermined value. The integral value is forcibly replaced with the predetermined value and set. As a result, an improper conduction ratio setting based on an integral value of an error detection output due to inertial rotation at the time of reversal is eliminated, and the operation is forcibly set to the predetermined value to operate, thereby realizing a stable rise. This is also effective in suppressing an excessive conduction ratio setting.

Hereinafter, embodiments will be described.

[0026]

(Embodiment 1) Hereinafter, an embodiment 1 of an electric washing machine of the present invention will be described with reference to the drawings. This embodiment relates to claims 1 and 2.

FIG. 1 is a circuit diagram showing the configuration of this embodiment. Note that the same components as those in the conventional example are assigned the same numbers, and detailed descriptions thereof are omitted. The configurations of the electric motor 1, the inverter 3, and the rectifying and smoothing circuit 20 are the same as those of the conventional example, but are not limited thereto. The position detecting means is also composed of Hall ICs 16u to 16w,
For example, a photo interrupter may be used.

The present embodiment is different from the conventional example in that the first coefficient a and the second coefficient b of the calculating means 8 in the control means 6 are variable, and the control means 6 controls the coefficient in accordance with the washing process. Is changed to control.

In the figure, the control means 6 comprises an operation mode command section 7, an arithmetic means 8, a triangular wave generating means 9, a conduction ratio setting means 10, a three-phase distribution circuit 11, a drive circuit 12, an error detection means 13, and a comparison circuit 14. , And speed detecting means 15. Operation mode command section 7, triangular wave generating means 9,
In the present embodiment, the conduction ratio setting means 10 and the three-phase distribution circuit 11 are constituted by a microcomputer. Here, the operation mode command unit 7 determines an operation sequence based on a command from the operation unit 22, and supplies the water supply valve 23, the drain valve 24, and the water supply pump 2.
5, and an instruction to turn on / off the electric motor 1 and the like. The three-phase distribution circuit 11 prepares, for example, a data table for determining the ON / OFF of the switching elements 4u to 5w as shown in FIG. 3 in advance corresponding to the output signals of the Hall ICs 16u to 16w for each driving direction. When an operation direction command for the electric motor 1 is output from the operation mode command unit 7,
A data table corresponding to the driving direction is set, and subsequently, when an ON command for the electric motor 1 is output, the switching elements 4u to 5w are set on / off based on the set data table. 4u ~
A 5w on / off signal is output.

The comparison circuit 14 is composed of, for example, a comparator, and compares the output signal of the triangular wave generation means 9 with the output signal of the conduction ratio setting means 10 to compare the switching signal of the switching element 4.
The on / off signal is output to the drive circuit 12 at the frequency of the triangular wave signal of the triangular wave generating means 9 by determining the conduction ratio of u to 5w. Drive circuit 12 includes, for example, a push-pull circuit composed of transistors by the number of switching elements 4u to 5w, and outputs the output signal of three-phase distribution circuit 11 and comparison circuit 14
The switching elements 4u to 5w are turned on and off by the logical product with the output signal of. Further, the speed detecting means 15 uses, for example, a clock signal of a microcomputer and a memory so that the speed of the output signal of one of the Hall ICs 16u to 16w (referred to as the Hall IC 16v in this embodiment) during one pulse of the output signal is obtained. The number of the clock signals is counted, and the speed is detected based on the count value.

The error detecting means 13 uses the arithmetic function of the microcomputer, and outputs the difference between the speed setting value output by the operation mode command section 7 and the output signal of the speed detecting means 15.
The arithmetic means 8 has, for example, the configuration shown in FIG.
The sum of a proportional component (P component) that multiplies the output signal of error detecting means 13 by a first coefficient a and an integral component (I component) that multiplies the integrated value of the output signal of error detecting means 13 by a second coefficient b. And outputs the operation result to the conduction ratio setting means 10 in 8 bits according to the output value of the error detection means 13. Here, the first coefficient a and the second coefficient b can be freely changed by the operation mode command unit 7 in each of the washing, rinsing, and dehydrating processes. In the present embodiment, the first coefficient a and the second coefficient b corresponding to each of the washing, rinsing, and dehydrating steps are stored in the memory of the microcomputer in advance, and when the predetermined step is reached, the predetermined coefficient The first coefficient a and the second coefficient b are used. However, the means for changing the first coefficient a and the second coefficient is not limited to this. It is not limited to FIG. The continuity ratio setting means 10 outputs the continuity ratio as a voltage value to the comparison circuit 14 by the 8-bit output of the operation means 8 by connecting the resistance to the 8-bit output terminal of the operation means 8.

FIG. 2 is a sectional view showing an example of the system of this embodiment. The outer frame 26 of the washing machine suspends a water receiving tub 28 by four hanging rods 27, and a washing and dewatering tub 29 is rotatably disposed in the water receiving tub 28. The stirring blade 30 is disposed rotatably. Electric motor 1
Drives the stirring blade 30 and the washing and dewatering tub 29 via the V-belt 31 and the speed reduction mechanism 32. Reference numeral 23 denotes a water supply valve, and reference numeral 24 denotes a drain valve. Reference numeral 33 denotes a control device including the motor 1, the operation unit 22, the water supply valve 23, the drain valve 24, and the water supply pump 25 in the circuit configuration shown in FIG. The configuration of the present embodiment is an example and is not limited to this. For example, a configuration without using the V-belt 31 or the speed reduction mechanism 32 may be employed.

The operation of the above configuration will be described.
For example, when a user sets a washing method via the operation unit 22, the operation mode command unit 7 determines an operation sequence based on the setting, sets a process to be executed, and sets the motor 1 corresponding to the operation sequence. Run command and drive direction command are 3
In addition to the input to the phase distribution circuit 11, the speed setting value is input to the error detection means 13, and the first coefficient a and the second coefficient b are input to the calculation means 8. At this time, the on / off timing of the electric motor 1, the speed set value, the first coefficient a, and the second coefficient b are stored in advance in the memory of the microcomputer, and the set values corresponding to the desired process are extracted and used. .

In the washing process, the operation mode command unit 7
However, the motor 1 outputs an operation command and an operation direction command to the three-phase distribution circuit 11 so that the motor 1 repeats on / off, normal rotation, and inversion. At this time, the three-phase distribution circuit 11 detects the operation command and the operation direction command, and turns on / off the switching elements 4u to 5w corresponding to the operation direction command, based on the data table, the output of the Hall ICs 16u to 16w. Set according to the signal. Switching element 4u ~
When on / off of 5w is set, the drive circuit 12 turns on / off the switching elements 4u to 5w, whereby a current flows through the three-phase winding 2 and the current path of the three-phase winding 2 is changed by the permanent magnet of the rotor. Motor 1 that is compatible with magnetic poles
Starts rotation.

When the motor 1 starts rotating, the speed detecting means 15 detects the relative speed of the rotor with respect to the stator by measuring the pulse interval of the Hall IC 16v, and outputs it to the error detecting means 13. Error detecting means 13
Compares the output value of the speed detection means 15 with the speed set value output by the operation mode command unit 7 and inputs the difference to the calculation means 8. The arithmetic means 8 performs an arithmetic operation using the first coefficient a and the second coefficient b in the washing process set by the operation mode command section 7, outputs an 8-bit signal to the duty ratio setting means 10, Reference numeral 10 outputs the conduction ratio corresponding to the 8-bit signal to the comparison circuit 14 as a voltage value.

The comparison circuit 14 compares the voltage value of the conduction ratio with the triangular wave signal of the triangular wave generating means 9 and outputs an on / off signal to the drive circuit 12 at the frequency of the triangular wave signal. The drive circuit 12 determines the logical product of the on / off signal of the three-phase distribution circuit 11 and the on / off signal of the comparison circuit to determine whether the switching elements 4 u to 5 w
On and off. Thus, the switching elements 4u to 4w can be turned on and off at a desired conduction ratio, and the electric motor 1
Can be accelerated with a desired time constant, and the speed can be stabilized with the speed set value. Thereafter, the operation mode command unit 7 follows the set washing process, and when a predetermined time has elapsed, the motor 1
Is output to the three-phase distribution circuit 11 to stop the motor 1, and when the predetermined time has elapsed again, the operation command and the operation direction command are operated so that the motor 1 is operated in the opposite direction. Input to 11.

Thereafter, the operation mode command section 7 inputs the operation command and the operation direction command of the electric motor 1 to the three-phase distribution circuit 11 for terminating the washing process based on the operation sequence and executing the rinsing process. The speed set value corresponding to the rinsing process is input to the error detecting means 13, and the first coefficient a and the second coefficient b corresponding to the rinsing process are input to the calculating means 8. At this time, the set values for the rinsing process stored in the memory of the microcomputer are input. Thereby, the electric motor 1 performs acceleration corresponding to the rinsing stroke to the speed corresponding to the rinsing stroke in the same operation as the washing stroke.

When the rinsing process is completed, the dewatering process is executed next.
And the load is also different because the washing and dewatering tub has no water and only laundry. In the present embodiment, the operation mode command unit 7 inputs the speed set value corresponding to the dehydration stroke to the error detecting means 13 and calculates the first coefficient a and the second coefficient b corresponding to the dehydration stroke by the calculating means 8.
, The motor 1 performs acceleration suitable for the load at the time of spin-drying, and stabilizes at the speed set value.

When the first coefficient a and the second coefficient b are stored and held in the memory of the microcomputer, if the capacity of the memory is limited, the first coefficient a and the second coefficient Only one of b and b may be changed. Even in this case, it is needless to say that a better result can be obtained than the conventional method in which the first coefficient a and the second coefficient b are fixed.

As described above, every time the stroke changes sequentially, the operation mode command unit 7 sets the set value corresponding to the stroke, that is, the speed set value, the values of the first coefficient a and the second coefficient b of the microcomputer. It is taken out of the memory and used to carry out washing and dehydration processes. Thus, the change in the responsiveness and stability of the electric motor 1 in each stroke due to the difference in the number of revolutions of the electric motor 1 in each of the washing, rinsing, and dehydrating strokes, and the uneven speed of the electric motor 1 are sufficiently large. The problem that the washing and dewatering performance cannot be exhibited is solved, and an electric washing machine with stable performance can be realized. In addition, since the arithmetic means 8 is built in the microcomputer, the size can be kept the same as that of the conventional electric washing machine, so that an electric washing machine with high cost performance can be realized.

(Embodiment 2) Hereinafter, Embodiment 2 of the electric washing machine of the present invention will be described. This embodiment relates to claims 1 and 3. The configuration of this embodiment is the same as that of FIG.

The present embodiment is different from the first embodiment in that when the user arbitrarily sets conditions such as the rotation speed in each stroke, the first coefficient a and the second coefficient b correspond to the conditions. Was changed.

In the electric washing machine shown in FIG. 2, the user can freely set conditions such as the operation time, the amount of water, and the speed of the electric motor 1 for each of the washing, rinsing, and dehydrating steps via the operation unit 22. Shall be. The operation mode command unit 7
In this case, the values of the first coefficient a and the second coefficient b of the calculating means 8 are stored in the memory of the microcomputer in advance as predetermined values for each setting content. Further, as an example, a first coefficient a and a second coefficient b corresponding to each condition such as the operation time, the amount of water, and the speed of the electric motor 1 are stored in the memory for each of the washing, rinsing, and dehydrating steps. By doing so, the washing and dewatering performance can be satisfied under all conditions. However, when there is a problem such as a small memory capacity of the microcomputer, the first coefficient a and the second coefficient b
May be changed according to the setting conditions, and the other may be fixed, or a certain conditional expression may be prepared in the memory of the microcomputer, and for each setting condition, A method of calculating the first coefficient a and the second coefficient b and inputting the result to the calculating means 8 may be used.

The operation of the above configuration will be described.
For example, if the user sets the speed of the stirring blade 30 to be very low in order to prevent the laundry from being damaged, and to shorten each operation of the washing process in order to quickly wash the laundry, the operation unit 22 becomes The set contents are transmitted to the operation mode command section 7, the operation mode command section 7 determines an operation sequence corresponding to each set content, inputs the speed set value of the electric motor 1 to the error detection means 13, and The coefficient a and the second coefficient b are input to the calculating means 8, and the electric motor 1 starts operating based on the speed set value and the first coefficient a and the second coefficient b. When the user wants to rotate the stirring blade 30 at a very high speed, the speed setting value corresponding to the setting is input to the error detecting means 13 and the first coefficient a and the second coefficient b are set. The data is input to the arithmetic means 8 and operated. In any case, by inputting the first coefficient a and the second coefficient b corresponding to each set condition to the calculating means 8, the time required for the electric motor 1 to reach the speed set value can be set regardless of the load condition. It becomes possible to make it constant.

As described above, the responsiveness and safety of the electric motor 1 can be ensured under various operating conditions, so that an electric washing machine equipped with various washing methods can be realized at low cost.

In this embodiment, the speed, the operation time, the amount of water used in the washing process, and the like of the motor 1 are set as the washing method. However, this is an example, and the ON time of the motor 1 in the washing process is set. In addition, conditions such as the setting of the off time and the type of the laundry may be set.

(Embodiment 3) Hereinafter, Embodiment 3 of the electric washing machine of the present invention will be described with reference to the drawings. This embodiment relates to claims 1 and 3.

FIG. 5 is a circuit diagram showing the configuration of this embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

The present embodiment is different from the first and second embodiments in that the control means 6 is provided with a cloth amount detecting means 34, and the first coefficient a and the second coefficient a corresponding to the cloth amount of the laundry. The control is to change the coefficient b.

In FIG. 5, the control means 6 includes an operation mode commanding unit 7, a triangular wave generating means 9, a conduction ratio setting means 10, a three-phase distribution circuit 11, a driving circuit 12, a calculating means 8, an error detecting means 13, and a comparing circuit 14. , Speed detecting means 15 and cloth amount detecting means 34. Cloth amount detecting means 34
Is a means for detecting the amount of laundry such as clothes put in the washing and dewatering tub 29 constituting the electric washing machine. In the present embodiment, the first coefficient a and the first coefficient a of the calculating means 8 are used as one method. A method is used in which the second coefficient b is set to a predetermined value and an 8-bit output value of the arithmetic means 8 is detected when the motor 1 is operating at a predetermined speed, but is not limited to this. Instead, for example, a method of detecting the speed of the electric motor 1 in a state where the value of the current flowing through the three-phase winding 2 is kept constant may be used. In the present embodiment, the operation mode command unit 7 stores the set values of the first coefficient a and the second coefficient b corresponding to the output signal of the cloth amount detecting means 34 in the memory of the microcomputer in advance. However, a certain conditional expression is prepared in the memory of the microcomputer, the first coefficient a and the second coefficient b are calculated in accordance with the output value of the cloth amount detecting means 34, and the result is calculated by the calculating means 8 May be used.

The operation in the above configuration will be described.
When the user selects the washing method via the operation unit 22, the operation mode command unit 7 sets the first coefficient a and the second coefficient b
Is set to a predetermined value, the value is input to the calculating means 8, the speed setting value is input to the error detecting means 13, and the operation command and the driving direction command of the electric motor 1 are input to the three-phase distribution circuit 11. Then, the motor 1 is operated at a predetermined speed. When the electric motor 1 is stabilized at a predetermined speed, the cloth amount detecting means 34
The 8-bit output of the arithmetic means 8 at that time is detected to detect the amount of laundry to be washed in the washing and dewatering tub 29, and the result is input to the operation mode command unit 7. The operation mode command unit 7 previously stores a data table of the first coefficient a and the second coefficient b corresponding to the detected cloth amount in the memory of the microcomputer, and the data table includes washing, rinsing, and dehydrating. It is assumed that the first coefficient a and the second coefficient b are set for each of the steps.

When the cloth amount detection is completed, the operation mode commanding unit 7 determines an operation sequence corresponding to the washing method set by the operation unit 22, and determines the operation sequence in the washing process corresponding to the output value of the cloth amount detecting means 34. The first coefficient a and the second coefficient b are input to the calculating means 8, the speed set value of the electric motor 1 in the washing process is input to the error detecting means 13, and the operation command and the operation direction command of the electric motor 1 are inputted in three phases. Input to the distribution circuit 11 to operate the electric motor 1. At this time, the electric motor 1 executes the same operation as described in the first embodiment based on the speed time constant set by the first coefficient a and the second coefficient b.

As described above, the cloth amount detecting means 34 reliably detects the amount of the laundry to be put in the washing and dewatering tub 29 and inputs the detection result to the operation mode command section 7, so that the electric motor is always output. The response time from the start of 1 to the speed setting value is stabilized irrespective of the amount of laundry, and the stability at the speed setting value is also increased. Therefore, even if the amount of laundry changes, an electric washing machine with stable washing and dewatering performance can be realized.

(Embodiment 4) Hereinafter, Embodiment 4 of the electric washing machine of the present invention will be described with reference to the drawings. This embodiment relates to claim 4.

FIG. 6 is a circuit diagram showing the configuration of this embodiment. Note that the same components as those in the third embodiment are assigned the same reference numerals, and detailed description is omitted.

This embodiment differs from the first to third embodiments in that the integrated value of the output value of the error detecting means 13 is controlled to be constant.

In FIG. 6, the control means 6 comprises an operation mode commanding section 7, an arithmetic means 8, a triangular wave generating means 9, a conduction ratio setting means 10, a three-phase distribution circuit 11, a driving circuit 12, an error detecting means 13, and a comparing circuit 14. , Speed detecting means 15.

In the present embodiment, the configuration of the calculating means 8 is the same as that shown in FIG. 4, but is not limited to this. The operation mode command section 7 sets an operation sequence corresponding thereto, inputs an operation command and an operation direction command of the electric motor 1 to the three-phase distribution circuit 11, inputs a speed set value to the error detection means 13, and further calculates an operation means. 8 first
And the second coefficient b.

The operation of the above configuration will be described by taking a washing process as an example. When a rightward rotation command is input from the operation mode command unit 7, the three-phase distribution circuit 11
Check the output signals of u to 16w. Thereafter, when an ON command for the electric motor 1 is input from the operation mode command unit 7, the Hall ICs 16u to 16w are obtained from the data table for clockwise rotation.
The on / off signals of the switching elements 4u to 5w corresponding to the output signals are input to the drive circuit 12. Three-phase distribution circuit 1
When the ON / OFF signals of the switching elements 4u to 5w are input by the drive circuit 1, the drive circuit 12 switches the switching elements 4u to 5w.
w, the current path of the three-phase winding 2 corresponds to the magnetic pole of the permanent magnet provided in the rotor, and
Starts rotation.

When the electric motor 1 starts rotating, the three-phase distribution circuit 11 causes the Hall I
Each time the signal of C16u to 16w changes, the on / off of the switching elements 4u to 5w is set correspondingly, so that the electric motor 1 keeps rotating. At this time, the error detecting means 13 inputs the difference between the speed setting value and the relative speed of the rotor with respect to the stator detected by the speed detecting means 15 to the calculating means 8, and the calculating means 8 calculates the conduction ratio based on this value. An 8-bit signal is input to the setting unit 10. The conduction ratio setting means 10 is provided with
The bit signal is converted into a voltage value, the comparison circuit 14 compares the voltage value with the triangular wave signal of the triangular wave generating means 9, and inputs the on / off signal of the switching element to the drive circuit 12 at the frequency of the triangular wave signal. The drive circuit 12 turns on and off the switching elements 4u to 5w by a logical product of the on / off signal of the switching element from the three-phase distribution circuit 11 and the on / off signal of the switching element from the comparison circuit 14,
The switching elements 4u to 5w are turned on and off at a desired duty ratio. As a result, the electric motor 1 keeps rotating at the set speed value.

Thereafter, the operation mode command section 7 inputs an off command of the electric motor 1 to the three-phase distribution circuit 11 at the time when a predetermined time has elapsed in accordance with a preset operation sequence.
The three-phase distribution circuit 11 inputs to the drive circuit 12 a command to turn off all the settings of the switching elements 4u to 5w. As a result, the switching elements 4u to 5w are all turned off, so that no current is supplied to the three-phase winding 2 and the motor 1
Will rotate by inertia. Here, the calculating means 8
An off command of the electric motor 1 output by the operation mode command unit 7 is detected, and a predetermined value is input to an integrated value of an output value of the error detection unit 13.

While the motor 1 is rotating with the inertial force, the operation mode command unit 7 inputs the left rotation and the ON command of the motor 1 to the three-phase distribution circuit 11 again based on the operation sequence. 3
In response to this command, the phase distribution circuit 11 sets ON / OFF of the switching elements 4u-5w corresponding to the output signals of the Hall ICs 16u-16w in accordance with the left rotation data table. Turns on and off the switching elements 4u to 5w. At this time, since the integrated value of the output value of the error detecting means 13 in the calculating means 8 is set to a predetermined value, it is sequentially added from this predetermined value.

Therefore, despite the fact that the motor 1 is rotating by inertia in the direction opposite to the operation direction command input to the three-phase distribution circuit 11 by the operation mode command unit 7, the arithmetic means 8 sets the conduction of the switching elements 4u to 5w. It is possible to prevent the output of the 8-bit signal whose ratio becomes smaller than the desired value, and to avoid a situation where the motor 1 does not easily rise to the speed set value.

According to the above control, in the case where the motor 1 repeats the normal rotation and the reversal, the unevenness of the speed of the motor 1 can be particularly prevented, so that the washing performance is remarkably deteriorated or the laundry is damaged. Can be prevented. However, this is merely an example, and the integral value may be set to a predetermined value corresponding to each stroke every time the stroke changes, or the integral value may be set each time the electric washing machine is turned on. May be set to a predetermined value.

[0065]

According to a first aspect of the present invention, there is provided an electric motor comprising a stator having a three-phase winding and a rotor which mutually generates an electromagnetic force by the current flowing through the three-phase winding. And an inverter for supplying power to the three-phase winding; and control means for controlling on / off of a switching element included in the inverter. The control means includes a triangular wave generating means, a conduction ratio setting means, and a stator. Speed setting means for setting a relative speed between the motor and the rotor, a speed detecting means for detecting the relative speed, and an error for outputting an instantaneous value of a difference between an output value of the speed setting means and an output value of the speed detecting means. Detecting means and calculating means, wherein the calculating means multiplies a value obtained by multiplying an output value of the error detecting means by a first coefficient and a value obtained by multiplying an integrated value of the output value of the error detecting means by a second coefficient. And outputs the sum of The duty ratio setting means sets the duty ratio of the switching element according to the output value of the arithmetic means, and compares the triangular wave signal output by the triangular wave generation means with the instantaneous value of the output signal of the duty ratio setting means. Electric washing using a power generation device that determines a duty ratio of a switching element and changes at least one of the first coefficient and the second coefficient in accordance with each process such as washing, rinsing, and dehydration. By setting the machine, a preferable conduction ratio is set for each of the washing, rinsing, and dehydrating steps, and the excess and deficiency of the performance due to the variation in operation between the steps is eliminated, and the responsiveness and stability of the electric motor in any of the steps are eliminated. To prevent the washing water from overflowing due to excessive acceleration or to fail to reach the specified speed due to insufficient acceleration, or to apply an excessive load to the motor or deceleration mechanism that constitutes the washing machine. Can be eliminated, such as a problem, it is possible to exhibit a sufficient ability to both each stroke. In addition, since the control means can be expanded and the calculation means can be realized in the processing of the microcomputer, the number of parts does not increase particularly, and the cost and dimensions are in the same range as the conventional electric washing machine. It can be easily realized.

According to a second aspect of the present invention, the control means includes:
The electric washing machine according to claim 1, wherein control is performed so as to change at least one of the first coefficient and the second coefficient in accordance with the washing method. It can respond properly to high-speed washing under a wide speed range and a wide load range, and can be used for fabric-friendly washing.

According to a third aspect of the present invention, the control means includes:
2. The electric washing apparatus according to claim 1, further comprising: a cloth amount detecting unit, wherein control is performed to change at least one of the first coefficient and the second coefficient in accordance with the cloth amount detected by the cloth amount detecting unit. By using the machine, regardless of the amount of cloth to be washed,
It is possible to always ensure an appropriate state, solve the problem that the required time fluctuates depending on the amount of cloth, and exhibit a sufficient washing function.

According to a fourth aspect of the present invention, the arithmetic means includes:
The electric washing machine according to any one of claims 1 and 2, wherein the integrated value of the output value of the error detecting means is kept constant when the electric motor is started, so that the inertia at the start of the electric motor, particularly at the start of the reversal start. The problem of inappropriate setting of the conduction ratio due to the integral value of the error detection output during rotation can be solved, the electric motor can be stably started, and the washing function can be stabilized.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of an electric washing machine according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing the configuration of the embodiment.

FIG. 3 is a schematic diagram showing a data table in the embodiment.

FIG. 4 is a block diagram showing a configuration of a calculation unit in the embodiment.

FIG. 5 is a circuit diagram showing a configuration of an electric washing machine according to a third embodiment of the present invention.

FIG. 6 is a circuit diagram showing a configuration of a fourth embodiment of the electric washing machine of the present invention.

FIG. 7 is a circuit diagram showing a configuration of a conventional electric washing machine.

FIG. 8 is a block diagram showing a configuration of an arithmetic unit in the conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Motor 2 3-phase winding 3 Inverter 4u, 4v, 4w, 5u, 5v, 5w Switching element 6 Control means 7 Operation mode command part (speed setting means) 8 Calculation means 9 Triangular wave generation means 10 Conduction ratio setting means 11 Three-phase Distribution circuit 12 Drive circuit 13 Error detection means 14 Comparison circuit 15 Speed detection means 16u, 16v, 16w Hall IC 17 Diode bridge 18 Choke coil 19 Smoothing capacitor 20 Rectifying smoothing circuit 21 Commercial power supply 22 Operation unit 23 Water supply valve 24 Drain valve 25 Water supply pump 26 Washing machine outer frame 27 Hanging rod 28 Water receiving tub 29 Washing and dewatering tub 30 Stirrer blade 31 V belt 32 Reduction mechanism 33 Control device 34 Cloth amount detecting means a First coefficient b Second coefficient

Claims (4)

[Claims] 1. An electric motor comprising a stator having a three-phase winding, a rotor that generates an electromagnetic force mutually with the stator by a current flowing through the three-phase winding, and an electric power supplied to the three-phase winding. And a control unit for controlling on / off of a switching element constituting the inverter, wherein the control unit includes a triangular wave generation unit, a conduction ratio setting unit, and a relative speed between the stator and the rotor. Speed setting means to set, speed detection means to detect the relative speed, error detection means to output the instantaneous value of the difference between the output value of the speed setting means and the output value of the speed detection means, and arithmetic means,
The calculating means calculates a value obtained by multiplying a value obtained by multiplying an output value of the error detecting means by a first coefficient and an integrated value of an output value of the error detecting means by a second value.
The duty ratio setting means sets the duty ratio of the switching element according to the output value of the arithmetic means, and outputs a triangular wave signal output by the triangular wave generating means. The duty ratio of the switching element is determined by comparison with the instantaneous value of the output signal of the duty ratio setting means, and the first coefficient and the second coefficient are determined according to each process such as washing, rinsing, and dehydration. An electric washing machine using a power generation device that changes at least one of the values. 2. The control means according to claim 1, wherein when the user arbitrarily sets conditions in each of the steps of washing, rinsing, and dehydrating, at least one of the first coefficient and the second coefficient corresponding to each of the conditions. The electric washing machine according to claim 1, wherein the electric washing machine is controlled so as to change the value. 3. The control means includes a cloth amount detecting means, and changes at least one of a first coefficient and a second coefficient according to the cloth amount detected by the cloth amount detecting means. The electric washing machine according to claim 1, which is controlled. 4. The electric washing machine according to claim 1, wherein the calculating means keeps the integrated value of the output value of the error detecting means constant when the electric motor is started.