JP2001276467A - Inverter washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter washing machine capable of making effective use of regenerated energy which is produced when an electromagnetic brake is applied to a motor which drives a washing rotor. SOLUTION: The inverter washing machine includes the motor 7 for driving the washing rotor; Hall sensors 55a to 55c for detecting the rotor rotating position of the motor 7; and an auxiliary control part 15 having an inverter 35 and driving the motor 7 according to position signals outputted from the Hall sensors 55a to 55c. The auxiliary control part 15 can apply the electromagnetic brake by delaying the phase of a sinusoidal voltage supplied to the motor 7, so that the phase is slower than it is during rotation. The regenerative energy produced is stored in capacitors 32a and 32b, and when the motor 7 temporarily stopped by the electromagnetic brake is reactivated, the regenerative energy is used to activate the motor 7. The amount of delay of the phase of the sinusoidal wave at the application of the electromagnetic brake is controlled in accordance with the voltage detected from an inverter input voltage detecting means 38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter washing machine in which a rotary tub and a stirring body are rotated by a brushless motor.

[0002]

2. Description of the Related Art In the washing process of a washing machine, the motor rotates forward and backward.
The water flow is generated by repeating the reverse rotation and rotating the stirrer provided at the rotating tank or the bottom of the rotating tank forward and backward. When changing the rotation direction of the motor, the brake is applied and stopped once, and then the motor is started in the reverse rotation direction. When the brake is applied, the motor generates regenerative energy by a power generation effect. In the case of a train or the like, the regenerative energy is stored in the current collector and returned to the power supply side to be used effectively. However, in the inverter washing machine, the regenerative energy is exclusively converted into heat energy and is radiated from the motor, so that it is wasted.

[0003]

In order to effectively use the regenerative energy, it is necessary to store the regenerative energy in the energy storage means provided on the power supply side from the time when the brake is started to the time when the next rotation is started. Must. When this regenerative energy is stored, the power supply voltage input to the inverter rises. If the rise of the inverter input voltage is too large, the power element (generally made of a semiconductor) and the energy storage means (generally made of a capacitor) constituting the inverter will be damaged or broken. Also, if the inverter input voltage is too small, a torque shortage occurs when the regenerative energy is used at the time of starting the reverse rotation. For this reason, it is necessary to control the inverter input voltage to be constant.

[0004] In view of the above problems, the present invention controls the inverter input voltage to be constant when regenerative energy is stored, and regenerates the regenerative energy generated when the motor is braked in the washing process. It is an object to provide an inverter washing machine that can be used for starting.

[0005]

In order to achieve the above object, in an inverter washing machine according to the present invention, there is provided a brushless motor operable to alternately rotate and reverse a washing rotating body to perform washing. A position detecting means for detecting a rotor rotational position of the motor, and a control section having an inverter means for driving the motor based on a position signal output from the position detecting means, wherein the control section has energy When the motor is temporarily stopped when the rotation direction of the motor is switched, a phase of the sine wave voltage supplied to the motor is delayed from a phase of the sine wave voltage supplied during rotation. By applying an electromagnetic brake to the motor, regenerative energy generated when the electromagnetic brake is applied is stored in the energy storage means. When the motor is started in a rotation direction opposite to the rotation direction before the stop, the motor is driven using the regenerative energy, and a voltage detection unit that detects a voltage of the energy storage unit is used. And a phase delay amount of the sinusoidal voltage at the time of the electromagnetic braking is controlled in accordance with the detected voltage.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an inverter washing machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a direct drive inverter washing machine having a pulsatorless structure according to the present embodiment. The washing machine 1 is a one-tub type fully automatic washing machine, and includes a rotary tub 2 also serving as a washing tub and an outer tub 3 inside a main body. The outer tub 3 is suspended from the main body by a suspension unit 4, and the rotary tub 2 is rotatably installed inside the outer tub 3. The main body has a lid 6 for taking in and out laundry. A transmission mechanism 8 for transmitting the rotation of the DC brush motor 7 to the rotary tank 2 is provided below the outer tank 3.

On the upper part of the main body, there are provided an operation unit 9, a display unit 10, a buzzer 11, a lid sensor 12 for detecting the opening and closing of the lid 6, and a lock mechanism 18 for controlling the opening and closing of the lid 6.
A water level sensor 13 for detecting a water level in the rotary tub 2 is provided on a side of the rotary tub 2. Further, a main control unit 14 composed of a microcomputer for controlling the entire operation of the washing machine 1 is provided below the operation unit 9. Further, a sub-control unit 15 including an inverter for supplying a drive signal to the motor 7 and a microcomputer for controlling the rotation of the motor 7 via the inverter is provided above the inner surface of the side plate 1a. I have. 16
Reference numerals 17 and 17 denote a water supply valve and a drainage valve for adjusting the amount of water in the outer tank 3.

FIG. 2 shows a schematic circuit configuration relating to the operation of the washing machine 1. The main control unit 14 stores a program such as an operation content of each process such as washing, rinsing, and dehydration, and a sequence of process execution (that is, a processing course), and opens and closes the water supply valve 16 and the drain valve 17 according to the program. And the motor 7 is controlled via the sub control unit 15.

The main control unit 14 inputs a signal such as a reservation for washing from the operation unit 9. The main control unit 14 outputs a signal for displaying the progress of the operation and the like to the display unit 10. Main control unit 1
4 sounds the buzzer 11 at the end of washing or the like. Main control unit 14
Inputs a signal indicating the open / closed state of the lid 6 from the lid sensor 12. The main control unit 14 inputs a signal indicating the water level in the rotary tank 2 from the water level sensor 13.

The main control unit 14 transmits a signal S1 necessary for controlling the rotation of the motor 7 to the sub control unit 15 together with a synchronization clock CLK. After reading the signal S1, the sub-control unit 15 that has received the signal S1 transmits the signal S2 to the main control unit 14 in synchronization with the clock CLK. Sub-control unit 1
Reference numeral 5 supplies a three-phase current to the motor 7 based on rotor position signals Hu, Hv, and Hw indicating the rotation position of the rotor of the DC brushless motor 7 to drive the motor 7.

Next, the configuration of the sub control unit 15 will be described with reference to FIG. The AC voltage output from the commercial power supply 30 is supplied to the rectifier circuit 31 via the reactor 5 and
In step 1, it is converted into a pulsating DC. The rectifier circuit 31 uses a diode bridge.

The DC rectified by the rectifier circuit 31 is smoothed by smoothing capacitors 32a and 32b. Capacitor 3
The + terminal of 2 a is connected to the + terminal of the rectifier circuit 31. The negative terminal of the capacitor 32a and the positive terminal of the capacitor 32b are connected to the negative output terminal of the commercial power supply 31. The negative terminal of the capacitor 32b is connected to the negative output terminal of the rectifier circuit 31. Capacitors 32a, 32b
Is supplied to the inverter circuit 35. Inverter circuit 35 converts DC into three-phase AC.

The inverter circuit 35 includes six NPN transistors 36a to 36c and 37a as switching means.
37c is a three-phase full-wave bridge configuration. Then, the six transistors 36a to 36c and 37a to 37
c are diodes 42a to 42c, 43a
To 43c are connected. Transistors 36a-36
The connection points a, b, and c between c and the transistors 37a to 37c are connected to the stator coils Lu, Lv, and Lw of each phase (U phase, V phase, and W phase) of the motor 7. The bases of the transistors 36a to 36c and 37a to 37c are connected to the drive circuit 40.

The motor 7 has Hall sensors 55a, 55b and 55c for detecting the rotational position of the rotor. The rotor position signals Hu, Hv, Hw output from the Hall sensors 55a, 55b, 55c are
1 is input. In addition, in the inverter washing machine 1 of this embodiment, a three-phase 20-pole DC brushless motor is used as the motor 7.

The microcomputer 41 outputs drive signals P1 to P6 to the drive circuit 40 based on the rotor position signals Hu, Hv, Hw. The drive circuit 40 amplifies the drive signals P1 and P2 and amplifies the transistors 36a,
The drive signals P3 and P4 are supplied to the base of the transistor 37a, and are amplified and supplied to the bases of the transistors 36b and 37b, respectively. The drive signals P5 and P6 are amplified and supplied to the bases of the transistors 36c and 37c, respectively.

Reference numeral 38 denotes an inverter input voltage detecting means for inputting the voltage of the connection node between the resistors R1 and R2 and detecting the input voltage of the inverter circuit 35. The detection output is sent to the microcomputer 41. The lid lock mechanism 18 is connected to the rectifier circuit 31, and the lid lock mechanism 18 is controlled by a microcomputer 41.

Next, a voltage waveform applied to the motor 7 will be described with reference to FIG. FIG. 4B shows a voltage waveform applied to the motor 7 when the motor 7 is constantly driven at a constant rotation speed based on the rotor position signals Hu, Hv, Hw shown in FIG. ing.

FIG. 4 shows (d1) and (d2) drive signals P1 and P2 generated by the microcomputer 41 in a procedure described later.
2 shows an example of such drive signals P1, P2
Is output, the output voltage to the U phase has a waveform subjected to PWM (Pulse Width Modulation) as shown in FIG. This waveform is substantially equivalent to a sine wave, and the voltage applied to the U-phase winding has a sine wave shape as shown in FIG. This is the same waveform as U in FIG. 4B.

As shown in FIG. 4B, when the U-phase is used as a reference, the inverter circuit 35 applies a voltage delayed by 240 ° to the V-phase and 120 ° to the W-phase in electrical angle. 7 is applied. By applying a sinusoidal voltage having a phase shift to each phase of the motor 7 in this manner, the rotor of the motor 7 rotates in the normal rotation direction.

When the V phase is used as a reference, the electrical angle is expressed as U
A voltage delayed by 120 ° to the phase and 240 ° delayed to the W phase is applied to the motor 7, and when the W phase is used as a reference, a voltage delayed by 240 ° to the U phase and 120 ° to the V phase in electrical angle is applied. Motor 7
Is applied.

The drive signals P shown in (d1) and (d2) of FIG.
The procedure for generating 1, P2 in the microcomputer 41 will be described. The microcomputer 41 is shown in FIG.
(C), a triangular wave 62 having a constant period Tc is internally generated, and the driving waveform data 61 having a sine wave shape and the triangular wave
2, the drive signals P1 and P2 having PWM waveforms as shown in (d1) and (d2) of FIG. 4 are generated.

The drive waveform data 61 is obtained from the sine wave data 61 stored in the memory of the microcomputer 41 using a data pointer (NEW_DATA) described later.
a. FIG. 7 shows sine wave data 61a,
The phase of the sine wave data 61a and the sine wave data 6
The relationship with the value of the data pointer (NEW_DATA) used to specify the address of 1a is shown.

The microcomputer 41 converts 2π radians, which is the phase of one cycle of the sine wave data 61a, to 65536.
Data pointer (NEW_D
Data processing is performed using ATA). The data pointer (NEW_DATA) is a digital value and 655
There are 36. Incidentally, as shown in FIG. 7, when the data pointer (NEW_DATA) is 0, the phase is 0 radian. Also, a data pointer (NEW_DATA)
Is 32768, the phase is π radians.

Since the phase angle θ of the sine wave signal having the frequency f at time t is generally θ = 2πft (radian) (1), the phase update amount Δθ for each cycle Tc (see FIG. 4) of the triangular wave 62 is obtained. Is Δθ = 2πf · Tc (radian) (2)

The phase and data pointer (NEW) shown in FIG.
_DATA), the phase is (655)
The value multiplied by (36 / 2π) is the data pointer (NEW_DA).
TA). Therefore, the update amount (α_DATA) of the data pointer (NEW_DATA) for each cycle Tc is a value obtained by multiplying Δθ of the equation (2) by (65536 / 2π), and α_DATA = 2πf · Tc · (65536 / 2π) 3)

For example, when a drive signal having a period Tc = 63.5 μs and a frequency f = 60 Hz is output, α_DATA = 249 (4). The cycle Tc of the triangular wave 62 is determined by the resolution of a timer used by the microcomputer 41 to measure the time interval of the cycle Tc and the resolution of PWM.

The microcomputer 41 adds a new data pointer (NEW_DATA) by adding the update amount (α_DATA) obtained by the equation (3) to the data pointer (NEW_DATA) for each cycle Tc of the triangular wave 62, so that a new data pointer (NEW_DATA) is obtained. Is updated at every cycle Tc as NEW_DATA = NEW_DATA + α_DATA (5).

For example, when a drive signal having a period Tc = 63.5 μs and a frequency f = 60 Hz is output, when the value of the data pointer (NEW_DATA) starts from 0, the following expression is obtained from the equations (4) and (5). Data pointer (NEW
_DTA) is sequentially updated to 0, 249, 498... Every 63.5 μs as shown in the enlarged view of FIG.

Next, a data pointer (NEW_DATA)
The amplitude value of the sine wave data 61a corresponding to the value is obtained.
The sine wave data 61a is data in which the phase of 2π radians is 512 bytes, and is composed of 854 basic data of (1 + 2/3) × 2π radians. These basic data include a sign bit. 2π radians is 5
12 table data (and therefore 512 addresses)
Therefore, the value of the data pointer (NEW_DATA) is set to 12
By designating the number obtained by dividing 8 (the number of data pointers for 2π radians 65536 divided by the number of addresses 512) as an address, the value corresponding to the corresponding address is read from the sine wave data 61a stored in the memory. And a value obtained by multiplying the obtained data by the modulation factor β is the driving waveform data 61
Becomes

When the rotation speed of the motor 7 is constant, it is only necessary to obtain the drive waveform data 61 as described above. However, when the rotation speed of the motor 7 changes, the drive waveform data 61 also depends on the rotation speed. Therefore, the drive waveform data 61 corresponding to the number of rotations of the motor 7 is created by the following method, and the rotation of the motor 7 is controlled.

FIG. 5 is a diagram showing a rotor position pattern and an operation mode when the sub control unit 15 rotates the DC brushless motor 7 in the normal rotation direction. The signal waveforms of the rotor position signals Hu, Hv, Hw are the same as the rotor position signal of FIG. 4A, and the drive waveform data 61u, 61v,
61w is the same as the voltage waveform of FIG.

The Hall sensors 55a, 55b and 55c can detect the rotor position even when the rotor is stopped. When starting the motor 7, the microcomputer 41 first checks the rotor position from the rotor position signals Hu, Hv, Hw to determine a start pattern. There are six types of starting patterns according to the rotor position patterns 0 to 5.

For example, when the rotor position signal Hu is at a high level,
The rotor position signal Hv is at a low level and the rotor position signal Hw is
Is low, the rotor position pattern is one. At this time, the sub control unit 15 sets the rotor position pattern 1
Focusing on the V phase at which the drive voltage becomes 0 at the start of the operation, the operation mode is set to mode a based on the V phase, and the drive waveform data 6
The initial phase of 1v is set to 0 °. From the relationship shown in FIG. 7, the data pointer (NEW_DATA) becomes 0, and the data point (NEW_DA
TA) is fetched. Since f in equation (3) is 0 when the motor 7 is started, the update amount (α_DAT)
A) determines an appropriate initial value from the experimental value. At the same time as the motor 7 is started, a speed detection timer for detecting the number of rotations of the motor 7 is started. The speed detection timer is provided in the microcomputer 41.

U-phase and W-phase drive waveform data 61u, 61
As described above, w is a drive signal delayed by 120 ° and 240 ° with respect to the V-phase drive waveform data 61v, respectively.
This causes the rotor to start rotating. Due to the rotation of the rotor, the switching of the rotor position signals Hu, Hv, Hw is 1
Rising edge 53c of the rotor position signal Hw
At this time, the microcomputer 41 assumes that the rotor is delayed, and the data pointer (NEW_D
When (ATA) reaches 10923 (corresponding to a phase of 60 °), the data pointer (NEW_DATA) is not updated until the rising edge 53c of the rotor position signal Hw is detected, and the control waits with the same data. When the rising edge 53c of the rotor position signal Hw actually comes, the updating of the data pointer (NEW_DATA) is restarted, the speed detection timer is reset, and the measurement is started again.

Further, the falling edge 53d of the rotor position signal Hu comes due to the rotation of the rotor. At this time, the microcomputer 41 pays attention to the U phase and sets the operation mode from the mode a based on the V phase to the U phase. Mode b. Also at this time, the microcomputer 41 assumes that the rotor is delayed, and when the data pointer (NEW_DATA) reaches 21845 (corresponding to the phase of 120 °), the microcomputer 41 detects the falling edge 53d of the rotor position signal Hu until the data pointer (NEW_DATA) is detected. NEW_DAT
A) Waiting for the same data without updating. Then, when the falling edge 53d of the rotor position signal Hw actually comes, the operation mode is switched from the V-phase reference mode a to the U-phase reference mode b, and the drive pointer is set to 0 to obtain the drive waveform data 61u. , V-phase, and W-phase drive voltage data 61v, 61w are 240 °
Data pointer delayed by 20 ° (NEW_DAT
Read and create data from A).

As described above, the six edges 53a to 53
At 3f, the drive voltage data is corrected. Further, since the rotation speed of the motor 7 is obtained from the value of the speed detection timer, the update amount (α_DATA) is changed so as to follow the rotation speed change at each inversion timing of the position signal.

As a result, the U-phase drive waveform data 61u
Is sinusoidal, and the edge 53 of the rotor position signal Hu
It becomes zero at a and 53d. V-phase drive waveform data 61v
Is sinusoidal, and the edge 53 of the rotor position signal Hv
It becomes zero at b and 53e. W-phase drive waveform data 61w
Is a sine wave, and the edge 53 of the rotor position signal Hw
It becomes zero at c and 53f.

In order to rotate the motor 7 in the reverse direction, the drive voltage data 61u, 61v, 61
What is necessary is just to delay the phase of w by 180 degrees.

Next, the control operation in the washing step will be described. In the washing process, after rotating the motor in one direction, applying the electromagnetic brake and stopping it once, rotating it in the opposite direction, then applying the brake again and stopping it by repeating the operation of normal rotation and reverse rotation Creating a stream of water. Here, a control operation when the motor shifts from normal rotation to reverse rotation will be described with reference to FIG. 6 as an example. When the motor is rotating, the update amount (α_DATA) is changed to an update amount according to the rotation speed of the motor as described above. When the rotation of the motor is stopped, the microcomputer 41 creates brake waveform data 63u, 63v, 63w delayed by 180 ° from the drive waveform data 61. The inverter circuit 35 outputs the brake waveform data 6
The voltage is supplied to the motor 7 based on 3u, 63v, 63w. Thus, the electromagnetic brake is applied to the motor 7. Similarly to the drive waveform data 61, the brake waveform data 63u, 63v, and 63w are corrected as needed at the inversion timing of the Hall sensors 55a to 55c, and become sine-wave data.

As shown in FIG. 8, the motor 7
, Reverse rotation in the next section Z2, and normal rotation again in the next section Z3. In the latter half of each section, regenerative energy is generated because the electromagnetic brake is applied. When this regenerative energy is stored in the capacitors 32a and 32b, the inverter input voltage detecting means 3 as shown by Pa in FIG.
The inverter input voltage detected at 8 rises. If the inverter input voltage is too high, the transistor 36 of the inverter circuit 35 exceeds the withstand voltage of the transistor.
Since there is a possibility that a to 36c and 37a to 37c may be damaged or broken, it is necessary to lower the inverter input voltage. on the other hand,
The stored regenerative energy is used when starting the motor 7 in the next section. At this time, the inverter input voltage decreases as indicated by Pb in FIG. If the inverter input voltage when the regenerative energy is stored is too small, the torque at the time of starting the rotation of the motor 7 decreases, so it is necessary to increase the inverter input voltage.

Therefore, the control as shown in FIG. 6 is performed so that the inverter input voltage is larger than the first specified value α and smaller than the second specified value β (α <β).
That is, when the sub-control unit 15 determines that the inverter input voltage is equal to or less than the first specified value α, the brake waveform data 63u, 63v, 63w is converted into the advanced phase waveform 63.
u ′, 63v ′, 63w ′ so that the position signal H
The value of the data pointer is reduced at the inversion timing of u, Hv, and Hw. As a result, if the inverter input voltage is still equal to or smaller than the first specified value α, the brake waveform data 63u, 63v,
The phase lead width of 63w is increased. Here, the advance of the phase of the brake waveform data 63u, 63v, 63w means that the amount of delay with respect to the drive waveform data 61u, 61v, 61w is reduced.

When the sub-control unit 15 determines that the inverter input voltage is equal to or higher than the second specified value β, the brake waveform data 63u, 63v, 63w is converted to the delayed waveforms 63u ″, 63v ″, 63v ″, 63v ″. The value of the data pointer is increased at the inversion timing of the position signals Hu, Hv, and Hw so that the value becomes 63w ''. As a result, if the inverter input voltage is still equal to or greater than the second specified value β, the brake waveform data 63u,
The phase delay width of 63v and 63w is increased. This means that the amount of delay with respect to the drive waveform data 61u, 61v, 61w also increases.

Next, the control of the inverter input voltage will be described for an embodiment different from the above embodiment. When the sub-control unit 15 determines that the inverter input voltage is equal to or less than the first specified value α, the sub-control unit 15 compares the on-time of the pulse signal data obtained by comparing the brake waveform data 63u, 63v, 63w with the triangular wave 62. Drive circuits 4 in which the pulse widths of the pulse signals P1 to P6 are uniformly reduced.
0, and controls so that the voltage applied to the motor 7 is reduced. As a result, the current flowing through the motor 7 is reduced, and the inverter voltage is increased.

When the sub control unit 15 determines that the inverter input voltage is equal to or higher than the second specified value β, the sub control unit 15 compares the brake waveform data 63u, 63v, 63w with the triangular wave 62 to determine the pulse. Signals in which the pulse width of the on-time of the signal data is uniformly increased are output to the drive circuit 40 as P1 to P6, and control is performed so that the voltage applied to the motor 7 is increased. As a result, the current flowing through the motor 7 is increased, and the inverter voltage is reduced.

Further, the control of the inverter input voltage may be performed in an embodiment combining the above two embodiments. In this embodiment, a target value, a third specified value γ smaller than the target value, and a fourth specified value δ larger than the target value are set.

When the inverter input voltage is equal to or less than the third specified value γ, the brake waveform data 63u, 63v, 63w
The value of the data pointer is reduced at the inversion timing of the position signals Hu, Hv, Hw so that the phase of the data pointer advances. When the inverter input voltage is larger than the third specified value γ and smaller than the fourth specified value δ, if the inverter input voltage is larger than the target value, the brake waveform data 63u, 63v, 63
w and the triangular wave 62, the pulse width of the on-time of the pulse signal data obtained is made uniform, and if the inverter input voltage is smaller than the target value, the brake waveform data 63
The on-time pulse width of the pulse signal data obtained by comparing u, 63v, 63w with the triangular wave 62 is reduced uniformly. When the inverter input voltage is equal to or higher than the fourth specified value δ, the value of the data pointer is increased at the inversion timing of the position signals Hu, Hv, Hw so that the phases of the brake waveform data 63u, 63v, 63w are delayed. Thereby, the inverter input voltage can be controlled to the target value.

Further, the energy storage means including the capacitors 32a and 32b may be configured as shown in FIG.
That is, when regenerative energy is stored,
As shown in (b), the capacitors 32a and 32b are connected in parallel,
When the regenerative energy is used up for starting the motor, the series is set to have a smaller capacitance than parallel (a). Switching between (a) and (b) is performed by controlling the switch 64 with a control signal from the microcomputer 41.

Thus, more energy can be stored at the time of regenerative energy recovery. Terminal 6
5, 66, 67, 68, and 69 are connected to the + side of the rectifier circuit 31, the − side of the rectifier circuit 31, the resistor R1, the resistor R2, and the AC power supply 30, respectively.

In this embodiment, a direct drive type inverter washing machine having a pulsatorless structure is used.
The present invention may be applied to an inverter washing machine or a drum-type inverter washing machine in which a motor rotates a pulsator. However, the effect of the present invention increases as the inertia force generated on the rotating body rotated by the motor increases.

[0050]

According to the present invention, the regenerative energy generated when the electromagnetic brake is applied is stored in the energy storage means, and when the motor is started again, the motor is driven using the regenerative energy. , The regenerative energy can be used effectively. Thereby, energy saving can be achieved. Further, a voltage detecting means for detecting a voltage of the energy storage means is provided, and a phase delay amount of the sinusoidal voltage at the time of the electromagnetic braking is controlled according to the detected voltage, so that the voltage of the energy means becomes too large. Can not be. Thereby, damage or breakage of the elements constituting the energy means and the inverter means can be prevented.

According to the present invention, an upper limit value and a lower limit value are set for the detection voltage, and the control is performed so that the detection voltage falls within these ranges. Control when utilizing the stored energy when starting the motor is facilitated.

According to the present invention, the upper limit value and the lower limit value are set for the detection voltage, and the on-duty for driving the switching element forming the inverter means is varied so that the detection voltage falls within the range of the upper and lower limits. The amount of stored energy is within a certain range, and control when utilizing the stored energy when restarting the motor after stopping is facilitated. Further, the control can be performed with higher accuracy than when the phase delay amount of the sinusoidal voltage is controlled.

Further, according to the present invention, an upper limit value and a lower limit value are set for the detection voltage, and the phase delay amount of the sine wave voltage is controlled so that the detection voltage falls within the range of the upper and lower limits. Since the control for varying the on-duty for driving the element is performed at a preset ratio according to the detection voltage, the target value can be reached earlier than when each control is performed independently. Thus, stable control can be performed.

Further, according to the present invention, the control unit includes energy storage means, and when the motor is temporarily stopped, the phase of the sinusoidal voltage supplied to the motor is changed to the phase of the sinusoidal voltage supplied during rotation. When the electromagnetic brake is applied to the motor by further delaying, regenerative energy generated when the electromagnetic brake is applied is stored in the energy storage means, and when the motor is temporarily stopped and then restarted, the Since the motor is driven by using the regenerative energy, the regenerative energy generated at the time of braking in the dehydrating step can be stored. Thereby, energy saving can be achieved.

Further, according to the present invention, the energy storage means is composed of a plurality of capacitors and varies the combined capacitance according to the operation state. Even if fluctuates, all regenerative energy can be stored,
In addition, the detection voltage can be made constant. As a result, energy can be saved, and control when utilizing the energy stored when the motor is restarted after the stop is facilitated.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an internal configuration of an entire inverter washing machine according to an embodiment of the present invention.

FIG. 2 is a circuit block diagram of the inverter washing machine shown in FIG. 1;

FIG. 3 is a block diagram of a sub-control unit of the inverter washing machine shown in FIG. 1;

FIG. 4 is a diagram showing a position signal and drive voltage data from a hall sensor of the inverter washing machine shown in FIG. 1;

FIG. 5 is a diagram showing a rotor position pattern and an operation mode in the forward rotation of the inverter washing machine shown in FIG. 1;

FIG. 6 is a diagram showing phase control of brake voltage data during normal rotation of the inverter washing machine shown in FIG. 1;

FIG. 7 is a diagram showing a relationship between sine wave data stored in a microcomputer in a sub-control unit of the inverter washing machine shown in FIG. 1 and a phase of the sine wave data by a data pointer;

FIG. 8 is a diagram showing the relationship between the number of rotations and the inverter input voltage when regenerative energy is used at the time of starting the next rotation.

FIG. 9 is a diagram showing a configuration of a capacitor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Inverter washing machine 2 Rotating tub 3 Outer tub 4 Suspension part 5 Reactor 6 Lid 7 DC brushless motor 8 Transmission mechanism 9 Operation part 10 Display part 11 Buzzer 12 Lid sensor 13 Water level sensor 14 Main control part 15 Sub-control part 16 Water supply valve 17 Drain valve 18 Lid lock mechanism 30 Commercial power supply 31 Rectifier circuit 32a, 32b Capacitor 35 Inverter circuit 36a to 36c, 37a to 37c NPN transistor 38 Inverter input voltage detecting means 40 Drive circuit 41 Microcomputer 42a to 42c, 43a to 43c Diode 55a 55c Hall sensor 61 drive waveform data 62 triangular wave 63u, 63v, 63w brake waveform data 64 switch 65-69 terminal Hu, Hv, Hw position signal P1-P6 drive signal Lu, Lv, Lw stay Octoil

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B155 AA01 AA06 BB15 BB19 CB06 HB10 HB24 KA36 KB08 KB11 LB21 LC02 LC08 LC15 LC17 LC28 MA01 MA07 MA08 MA09 5H560 AA10 BB04 BB07 BB12 DA02 DA19 DB16 DC01 DC13 EB02 HC07 EC10 TT01 TT11 TT15 UA02 XA06 XA12 5H576 AA12 BB02 CC01 DD02 EE11 HA02 HB02 JJ03 LL24 LL41

Claims (8)

[Claims] 1. A brushless motor which operates so as to perform washing by alternately rotating and inverting a rotating body for washing, position detecting means for detecting a rotational position of a rotor of the motor, and inverter means. A control unit that drives the motor based on a position signal output from a detection unit.The inverter washing machine includes: an energy storage unit; the control unit includes an energy storage unit; When the motor is temporarily stopped, the electromagnetic brake is applied to the motor by delaying the phase of the sinusoidal voltage supplied to the motor from the phase of the sinusoidal voltage supplied during rotation. When the regenerative energy generated in is stored in the energy storage means, and when the motor is started in a rotation direction opposite to the rotation direction before stopping, The motor is driven by using the regenerative energy, and comprises a voltage detecting means for detecting a voltage of the energy storage means, according to the detected voltage of the sinusoidal voltage at the time of the electromagnetic brake An inverter washing machine characterized by controlling a phase delay amount. 2. When the regenerative energy is stored in the energy storage means, if the detected voltage is equal to or higher than a predetermined upper limit, the phase delay amount of the sinusoidal voltage is increased so as to decrease the detected voltage. The inverter washing machine according to claim 1, wherein when the detected voltage is equal to or less than a predetermined lower limit, the phase lag amount of the sinusoidal voltage is reduced so as to increase the detected voltage. 3. A brushless motor operable to perform washing by alternately inverting the rotating body for washing to perform washing, position detecting means for detecting a rotor rotation position of the motor, and switching means controlled by a pulse signal. A control unit for driving the motor based on a position signal output from the position detection unit, the control unit including an energy storage unit, When temporarily stopping the motor when switching the rotation direction of the motor, the electromagnetic brake is applied to the motor by delaying the phase of the sinusoidal voltage supplied to the motor from the phase of the sinusoidal voltage supplied during rotation. The regenerative energy generated when the electromagnetic brake is applied is stored in the energy storage means, and the motor is stopped. When starting in the rotation direction opposite to the rotation direction before stopping, the motor is driven using the regenerative energy, and a voltage detection unit that detects a voltage of the energy storage unit is provided. When the regenerative energy is stored in the energy storage unit, if the voltage detected by the detection unit is equal to or more than a predetermined upper limit, the on-duty of the pulse signal that drives the switching unit to reduce the detection voltage is reduced. If the detected voltage is lower than a predetermined lower limit when the regenerative energy is stored in the energy storage means, the detected voltage is increased. To reduce the on-duty of the pulse signal for driving the switching means, Inverter washing machine applied voltage and controlling so as to be lower. 4. A brushless motor operable to perform washing by alternately rotating and reversing a washing rotating body, position detecting means for detecting a rotor rotation position of the motor, and switching controlled by a pulse signal. A control unit for driving the motor based on a position signal output from the position detection unit, the control unit including an energy storage unit, When temporarily stopping the motor when switching the rotation direction of the motor, the electromagnetic brake is applied to the motor by delaying the phase of the sinusoidal voltage supplied to the motor from the phase of the sinusoidal voltage supplied during rotation. The regenerative energy generated when the electromagnetic brake is applied is stored in the energy storage means, and the motor is When starting in the rotation direction opposite to the rotation direction before stopping, the motor is driven using the regenerative energy, and a voltage detection unit that detects a voltage of the energy storage unit, When storing the regenerative energy in the energy storage means, if the voltage detected by the detection means is equal to or more than a predetermined upper limit, control to increase the phase delay amount of the sinusoidal voltage so as to decrease the detection voltage. Performing a control to increase the on-duty of the pulse signal for driving the switching means to increase the voltage applied to the motor at a ratio set in advance according to the value of the detection voltage; If the detected voltage is less than or equal to a predetermined lower limit when regenerative energy is stored in the energy storage means, And a control for the small phase delay of the sinusoidal voltage so as to increase and a control voltage applied to reduce the on-duty of the pulse signal for driving the switching means and the motor is set to be low,
In a preset ratio according to the value of the detection voltage. 5. A brushless motor operable to rotate a washing rotator to perform washing, a position detecting means for detecting a rotor rotation position of the motor, and an inverter means, and output from the position detecting means. A control unit that drives the motor based on the position signal, wherein the control unit includes energy storage means and supplies a sine to the motor when the motor is temporarily stopped. Applying an electromagnetic brake to the motor by delaying the phase of the wave voltage from the phase of the sinusoidal voltage supplied during rotation, storing regenerative energy generated when the electromagnetic brake is applied in the energy storage means, When the motor is temporarily stopped and then restarted, the motor is driven using the regenerative energy. And a voltage detecting means for detecting a voltage of the energy storage means, and controlling a phase delay amount of the sinusoidal voltage at the time of the electromagnetic braking according to the detected voltage. Machine. 6. The inverter washing machine according to claim 1, wherein said washing rotator is a rotating tub provided inside an outer tub. 7. The inverter washing machine according to claim 1, wherein said rotating body for washing is a stirring body provided inside said rotating tub. 8. The energy storage means includes a plurality of capacitors and means for varying a combined capacitance of the plurality of capacitors according to an operation state of the inverter washing machine. The inverter washing machine according to claim 1.