JP3518017B2 - Motor control device and washing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control device, and more particularly to a motor drive method, rotation stability at the time of starting the motor, and a circuit failure detection method.

[0002]

2. Description of the Related Art FIG. 33 shows, for example, Japanese Patent Laid-Open No. 2-26287.
FIG. 34 shows a drive circuit of a conventional single-phase induction motor shown in Japanese Patent Publication No. 8 and, in FIG. 33, 1 is a commercial power supply, 2 is a single-phase induction motor, and 11 is a zero-cross detection for detecting a zero-cross of the commercial power supply 1. A circuit, 8 is a trigger pulse generation circuit, to which a zero-cross detection signal is input. Reference numeral 12 is a triac, and the trigger pulse generation circuit 8 controls the triac 12. 6 is a rotation detector. Reference numeral 19 is a start compensating circuit, 23 is a start compensating phase angle data input terminal, 20 is an operation start signal input terminal connected to the set terminal S, and 22 is a switch for switching control by Q output. Reference numeral 21 is a set rotation speed data input terminal, 13 is a subtraction circuit, 14 is a coincidence detection circuit for detecting coincidence between the rotation speed data from the subtraction circuit 13 and the rotation speed detected by the rotation speed detector 6, and 15 is a motor rotation speed. The output terminal of the timer counter for measuring the rise time of the number and the coincidence detection circuit 14 is connected to the timer counter 15 and the activation compensation circuit 19. 1
Reference numeral 6 is an arithmetic circuit for estimating the phase angle, 17 is an error detection circuit for detecting the difference between the set rotational speed data and the rotational speed of the rotational speed detector 6, and 18 is an integrating circuit for determining the phase angle.
And each output of the error detection circuit 17, and the output terminal is connected to the a contact of the switch 22.

Next, the operation will be described. When the motor 2 is stopped, the set rotation speed data input terminal 21 gives the set rotation speed. When the operation start signal is given to the operation start signal input terminal 20, the start compensation circuit 19 is set, and its Q
The output serves as the contact b of the switch 22, the starting compensation phase angle data 23 is given to the trigger pulse generating circuit 8, and the motor starts rotating. The data of the rotation detector 6 is compared with the set rotation speed data from the subtraction circuit 13 in the coincidence detection circuit 14. The timer counter 15 integrates the time until the rotation speed data and the rotation speed from the rotation speed detector 6 match, and the rising time until the motor 2 reaches the set rotation speed is measured. If both data match, the arithmetic circuit 16 estimates the initial value of the phase angle required to obtain the set rotation speed from the rise time, and the integration circuit 18 sets the value. At the same time, the startup compensation circuit 19 is reset and Q
The switch 22 is switched to the contact a by the inversion of the output, and the output of the integrating circuit 18 is input to the trigger pulse generating circuit 8. In this way, when the rotation speed of the motor 2 reaches the set rotation speed data, the phase angle estimated from the rising time is switched. Further, as a technology related to the pulse generation circuit of the TRIAC, the actual technology is disclosed in Shokai 63-19
No. 1898 is known.

[0004]

Since the conventional motor drive circuit is constructed as described above, the pulse signal for driving the triac has a constant width. Therefore, if the current phase of the motor leads the phase of the power supply, the triac is driven. There was a problem that could not be driven. Further, when controlling the rotation speed of the motor, it is necessary to calculate the time from the zero-cross signal of the power supply in order to determine the timing of outputting the pulse signal for driving the triac, and this calculation depends on the difference in the power supply frequency. Since it was done in a separate routine, the program became long and the calculation time also became long.

Further, since it is driven at a constant phase angle at the time of startup, it takes time to reach the target rotation speed. When the motor is controlled at the target speed, the triac ignition timing is at a constant time interval, so the motor's tricripple is also constant, and as a result, the motor's vibration frequency is fixed and a specific harsh noise is heard. It has happened. When the maximum rotation speed at a power supply frequency of 50 Hz is the maximum rotation speed of the motor, 60H
When the control was lost by the phase control in z, it continued to rotate beyond the maximum number of rotations used.

When the triac that drives the motor fails, the failure cannot be detected and the control circuit continues to output the drive signal. When the microcomputer in the control circuit runs out of control, there is a problem that the forward rotation and reverse rotation triacs of the motor are simultaneously fired and an excessive current flows.

The present invention has been made to solve the above problems, and an object thereof is to obtain a highly reliable motor control device. Further, according to the present invention, even if the phase of the motor leads the phase of the power source, the motor can be driven reliably
In addition, the calculation of the triac ignition timing by the microcomputer can be processed by the same program routine even if the power supply frequency is different, and the target rotation speed can be reached early when the motor is started, and the phase control Thus, it is possible to obtain a control device that can be used for a wide range of purposes, such as being able to reduce a specific jarring sound caused by tricripple. Further, it is possible to detect a failure of the triac and the abnormal rotation speed of the motor at the time of the triac failure. Another object of the present invention is to prevent simultaneous energization of the forward and reverse rotation triacs of the motor. Further, it is possible to obtain a control device that can obtain a motor-using device that is easy to use. The aim is to obtain a washing machine that is more reliable and easy to use.

[0008]

A motor control device according to the present invention comprises a motor, a rotation detecting means for detecting the speed of the motor, a motor driving means for performing phase control by energizing a coil of the motor, and a commercial power source. A zero-crossing detecting means for detecting the zero-crossing signal, and a speed calculating portion for calculating an output timing to the motor driving means based on the output signal of the rotation speed detecting means and the speed command value and outputting a driving signal. The output timing of the drive signal output from the to the motor drive means is varied around the target output timing time, and the output timing of this drive signal normalizes the time between consecutive power supply zero-cross signals,
It is determined by this normalized time.

[0009]

The motor control device of the present invention controls so that the target output timing time and the average value when the output timing time is varied back and forth are substantially the same.

[0011]

The motor control device of the present invention always normalizes the output timing of the drive signal during operation.

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

The washing machine of the present invention is equipped with at least one of the above motor control devices.

[0026]

[0027]

According to the present invention, the output timing of the signal for driving the motor is varied before and after the target value to make the motor silent.

[0028]

Further, according to the present invention, the average of the variations in the output timing is made to substantially match the target value.

According to the present invention, the output timing of the signal for driving the motor is normalized with respect to the power source to perform the phase control.

According to the present invention, the normalization of the output timing of the signal is always performed during operation.

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

[0040]

[0041]

[0042]

[0043]

Further, the washing machine of the present invention is equipped with a highly reliable motor control device.

[0045]

[0046]

【Example】

Example 1. Embodiment 1 of the present invention will be described with reference to the drawings. Figure 1
In the figure, 1 is a commercial power supply, 2 is a single-phase induction motor, 3 is a capacitor, 4 is a rotation speed detector that detects the rotation speed of the single-phase induction motor 2, and 6 is a rotation speed signal output from the rotation speed detector 4. , 12a and 12b are triacs for energizing the main winding and auxiliary winding of the single-phase induction motor 2, 9a
Is a triac drive signal for driving the triac 12a, 9b is a triac drive signal for driving the triac 12b, 8 is a trigger pulse generation circuit for outputting the triac drive signal 9, 10 is a rotation speed command signal, and 11 is a zero cross of the commercial power supply 1. Zero cross detection circuit to detect,
Reference numeral 7 denotes a rotation speed signal 6, a rotation speed command signal 10, and an output signal of the zero-cross detection circuit 11, and a speed calculator for calculating the output timing of the triac drive signal 9 is provided.
A microcomputer 5 for outputting a signal to the trigger pulse generation circuit 8 is a control circuit composed of the microcomputer 7, the trigger pulse generation circuit 8 and the zero-cross detection circuit 11.

Next, the operation of this embodiment will be described.
By inputting the rotation speed command signal 10 to the microcomputer 7, the drive timing of the triac 12 is determined based on the signals from the zero-cross detection circuit 11 and the speed detector 4, and the timing signal is output to the trigger pulse generation circuit 8. . A driving pulse signal is output from the trigger pulse generation circuit 8 to the triac 12, the triac 12 is turned on, and the single-phase induction motor 2 is rotated. The rotation speed of the single-phase induction motor 2 is detected by the rotation speed detector 4, and the rotation speed signal 6 is output to the microcomputer 7. Here, the drive timing of the triac 12 is calculated by the microcomputer 7 so as to match the rotation speed command signal 10.
Feedback control by phase control is performed. The triac 12a is for forward rotation, and 12b is for reverse rotation.

2, 3 and 4 show the voltage waveform V of the commercial power source 1,
The operation timings of the zero-cross signal output from the zero-cross detection circuit 11, the trigger pulse signal output from the trigger pulse generation circuit 8, and the current waveform I flowing through the single-phase induction motor 2 are shown. In FIG. 2, the trigger pulse signal has a pulse width of 1 msec and is 5 m from the zero-cross signal.
It is generated with a delay of sec, the triac 12 is turned on at this generation timing, and a current flows to the single-phase induction motor 2 and is controlled by phase control. In FIG. 3, the trigger pulse signal is generated immediately after the zero-cross signal, and the current flows at the generation timing of the first trigger signal, but at the next trigger timing, the motor current becomes the lead phase (2 msec) and the trigger pulse width ( If the phase is advanced for more than 1 msec), the triac cannot be ignited and the phase cannot be controlled.

Here, in consideration of the maximum lead phase of the motor current, the trigger pulse width is set to 3 msec in order to reliably drive the triac. As shown in Fig. 4, the trigger pulse signal output timing is 3 msec from the zero-cross signal.
Within the range, by setting the output width of the trigger pulse signal to 3 msec, the triac can be driven reliably with the maximum lead phase of the motor current, and the phase control can be performed. Further, in the above embodiment, the case where the trigger pulse is a one-pulse output has been described, but the same effect can be obtained when the trigger pulse outputs a signal composed of a plurality of pulses. A signal consisting of a plurality of pulses means a trigger signal of 3 ms.
In the case of ec output, it is a signal that sends many pulses instead of one pulse in this 3 msec. The signal for TRIAC ignition is a pulse signal to reduce the power consumption of the circuit, which enables downsizing of the power supply circuit and downsizing of the circuit, and the installation space for the washing machine. Further, by using a pulse train as the signal for widening the output width, the signal generating circuit becomes simpler and the power consumption can be further reduced.

The trigger pulse in the above description refers to the case where the trigger pulse exists within a fixed time (3 msec in the embodiment) from the zero-cross signal regardless of the difference between the target and actual rotational speeds and the magnitude of the load. Here, the trigger pulse signal being within a certain time period from the zero-cross signal generally occurs when the motor load is large, including during acceleration. Since the generation timing of this trigger pulse is determined by the calculation of the microcomputer 7 from the rotation speed signal 6 and the rotation speed command signal 10 from the rotation speed detector 4 which detects the rotation speed of the single-phase induction motor 2, Near zero cross (3m in the example)
sec), or not. This pulse width determination flow is shown in FIG. In this way, the pulse signal width for driving the triac is 3 mse.
If c is set, a current is supplied from the power source for 3 msec. Also, if the pulse signal width is 1 msec, 1 ms from the power supply.
Supply current between ec. Therefore, if the pulse width can be driven by a triac, the narrower the pulse width is, the lower the power consumption becomes, and the power consumption of the power supply circuit can be reduced and the size can be reduced. The above description has been given of the main coil and the auxiliary coil of the single-phase induction motor, but it is needless to say that the present invention is not limited to this description as long as the motor having the coils controls the phase.

Example 2. A second embodiment of the present invention will be described with reference to the drawings. FIG. 6 shows a flow of a calculation routine for calculating the ignition timing of the triac for energizing the motor. Here, the circuit configuration is shown for the same case as the first embodiment, and the basic operation is as described above.

Next, the operation of this embodiment will be described.
In FIG. 6, (Step 1) First, the rotation speed of the single-phase induction motor 2 is detected by the rotation speed detector 4, and the rotation speed signal 6 is input to the microcomputer 7. (Step 2) The rotation speed signal 6 is compared with the rotation speed command signal 10. (Step 3) The ignition position of the triac, which is the time from the zero-cross signal of the power supply to the output of the trigger pulse, is calculated and converted into normalized data within the range of 0 to 100%. (Step 4) Next, the normalized data is multiplied by the power supply half cycle time to calculate the triac ignition position that matches the power supply frequency. The normalized data is such that the half cycle time of the power supply frequency is 100%. In this step 4, it is possible to determine the vicinity of the zero cross in the first embodiment, and it is determined whether this is within 3 msec, for example. Here, a procedure for creating the above normalized data will be described. When the motor is controlled to the target number of revolutions by the phase control, the firing timing of the triac for driving the motor is different when the power supply frequency is 50 and 60 Hz. Therefore, it is necessary to determine each power supply frequency and determine this timing. is there. This frequency determination may be performed by a microcomputer when the power is turned on. After determining the power supply frequency, measure the time between two consecutive power supply zero-cross signals, and measure this time as 100%.
And the normalized data is from 0 to 100%. After that, the processing in the calculation routine of FIG. 6 is performed during the operation under the phase control. That is, the time between consecutive power source zero-cross signals is normalized, and calculation is performed using this data. Even if the power supply frequency changes, the calculation routines (step 1) to (step 3) remain the same calculation program and can be dealt with only by changing the power supply half cycle time in (step 4). It is possible to simplify and shorten the calculation time.

The conditions used for the calculation of the ignition position in FIG. 5 are the rotation speed signal, the rotation speed command signal, and the power supply half cycle time. Next, FIGS. 7 and 8 show the zero-cross time measurement of the commercial power supply and the discrimination of the power supply frequency. Fig. 7 shows the procedure of measuring the zero-cross time after detecting the zero-cross signal. The falling edge of the signal waveform is detected (step 1), the timer is started by this detection (step 2), and the next signal waveform falls again. The edge is detected (step 3) and the timer is stopped. At this time, the internal timer of the microcomputer indicates the time between two consecutive zero-cross signals. Alternatively, if the power supply frequency can be determined, it can be calculated. For example, at 50 Hz
--1 / 50/2 = 10 msec It is good to store in the memory. On the other hand, FIG. 8 shows the procedure for determining the power supply frequency, in which the zero-cross signal of the power supply is input to the microcomputer by the zero-cross detection means (step 1), and the time t between the zero-cross signals is measured by the procedure of FIG. 7 (step 2). ). Based on this time, it is determined whether it is 50 Hz (steps 3, 4) or 60 Hz (steps 5, 6). For this judgment, the power half cycle time data stored in advance by the program is called and it is judged whether or not it exists near this time. After this, as shown in FIG. 6 and step 4, for example, 50 Hz,
If normalized data = 0.2, firing position = 10 × 0.
2 = 2 msec, and a trigger pulse is issued 2 msec after the zero-cross signal is detected. The setting of the power supply frequency in FIG. 6, that is, the power supply half cycle, is different from the calculation routine in FIG. 5 for calculating the ignition position when it is determined when the power is turned on to the washing machine.

Example 3. A third embodiment of the present invention will be described with reference to the drawings. The circuit configuration is shown for the same case as the first embodiment, and the basic operation is as described above. FIG. 9 shows a motor control block diagram for performing PI control. Reference numeral 27 denotes a PI control unit, which inputs a 25 revolution speed deviation ΔW which is a difference between a target revolution speed W * of 24 and a motor revolution speed W of 26. Then, a command voltage V of 28 is output. A limiter 29 inputs the command voltage V of 28 to limit it to an arbitrary value, and
The motor applied voltage V ′ of 0 is output. Reference numeral 31 denotes a motor model, which is composed of a torque generator 32 for inputting the motor applied voltage V ′ of 30 and a motor shaft inertia 35. The generated torque Te33 is output from the torque generator 32, and the generated torque Te33 is output.
The difference between the torque Te generated by and the load torque TL of 34 becomes the motor shaft inertia 35. 36 is the motor speed ω at this time
Is. Reference numeral 4 denotes a rotation speed detector for detecting the rotation speed of the motor, which inputs the motor rotation speed ω36 which is the output of the motor model 31 and outputs the motor rotation speed W26. Figure 1
Reference numeral 0 indicates a calculation routine of calculation performed by the PI control calculation unit 27.

Next, the operation of this embodiment will be described.
In FIG. 9, in the rotation speed detector 4, the motor rotation speed ω3
6 is measured, and the motor rotation speed W26 of a pulse signal having a frequency proportional to the motor rotation speed ω36 is output. The rotation speed deviation ΔW25, which is the difference between the motor rotation speed W26 and the target rotation speed 24, is output to the PI control calculation unit 27. Here, the rotation speed deviation ΔW25 is input, the calculation is performed according to a calculation routine, and then the command voltage V28 applied to the motor is output. This command voltage V28 is applied to the limiter 29 with a duty ratio of 100%.
To 20%, and is output to the torque generator 32 as the motor applied voltage V′30. Torque generator 32
Then, a torque proportional to the motor applied voltage V'30 is generated. Generated torque Te33 and load torque TL 3 here
The motor has an inertia 35 of the motor shaft with a torque different from that of 4, and rotates at the motor rotation speed ω36. By repeating the above operation, the motor rotation speed W is controlled so as to match the target rotation speed W *.

Here, a calculation routine for calculating the TRIAC ignition timing under the PI control will be described with reference to FIGS. 9 and 10. (Step 1) First, the proportional term data G1 (=
K1 × ΔW) is zero, integral term data G2 (ΣΔW × K
Enter an initial value A other than zero in 2). G1 = 0, G2 = A (Step 2) The product of the rotational speed deviation ΔW and the proportional term gain K1 is set as proportional term data G1. Here, the rotation speed deviation ΔW is calculated by the following formula. ΔW = W * −W = (1−T * / T) / T * (1) Equation (1) is normalized to ΔW = (1−T * / T) (2) T is the rotation speed detector The output pulse width T * is obtained by adding the product of the target output pulse width (step 3) rotation speed deviation ΔW of the rotation speed / speed detector and the integral term gain K2 to the new integral term data G2 in addition to the old integral term data G2.
And Here, when the calculation routine is the first time, the old integral term data G2 becomes the initial setting value A.

(Step 4) The sum of the proportional term data and the new integral term data is set as the proportional and integral term addition value GG. GG = G1 + G2 = K1 × ΔW + ΣΔW × K2 (3) (Step 5) The proportional / integral term addition value GG is limited to zero when it is zero or less and to one when it is 1 or more. Here, to simplify the calculation, GG is limited from zero to one. (Step 6) TT sets the limited GG data to 1
Is the complement of. (Step 7) The limiter limits the maximum value of TT to 0.8. Where the triac is 20 to 100
It will be ignited by electricity.

(Step 8) The time TCNT from the power source zero cross signal to the trigger pulse signal is calculated. TCNT = TT × TMAX (4) TT is a value in which GG data is 1's complement TMAX is a half cycle time of the power supply frequency (step 9) Input waiting time of the power supply zero-cross signal. The circuit 11 detects the power source zero cross and outputs the timing signal to the microcomputer. (Step 10) From power zero cross signal input to TCNT
Wait for the time to pass. (Step 11) A trigger pulse for driving a triac is output. After the trigger pulse having a constant time width is output in (step 11), the process proceeds to (step 2) and the same processing is performed thereafter.

Here, the initial value of the integral term G2 in (step 1) is ΔW = 0, G1 = when the motor rotation speed W26 matches the target rotation speed W * 24 and the target rotation speed is obtained.
When the value becomes 0 and G2 = A at this time, this value A is set. At startup, if the initial value G2 = 0, the integral term data G
Since it takes time for 2 to be accumulated and to reach A, it took time at the time of initial activation. So G2
By setting A to A, the cumulative time can be shortened and the target value can be reached quickly from the first activation.
In the case of performing the activation a plurality of times, the data of the first time may be used as the integral term data G2 at the second and subsequent activations. In the case of a washing machine, washing can be surely performed from the first start.

From the above, for example, the TRIAC ignition position calculation of step 3 of FIG. 6 of the second embodiment is calculated by TT × TMAX (= TCNT) of step 8 of the third embodiment of FIG. As a result, when the motor rotation rises rapidly as shown in the first activation of FIG. 16, a strong water flow is generated, so that the cleaning can be reliably performed. The PI control integral term has a learning function, and stores test data by the manufacturer or a value at the time of previous use and sets it to an initial value. The procedure is shown below. a. At the end of the cleaning process, the integral term data is stored in the memory. (It may be test data from the manufacturer) b. At the start of the cleaning process, the integral term data is read from the memory. c. At the first activation, the data stored in the memory is used for calculation. d. At the second activation, the data obtained at the first activation is used in the calculation. e. After the third time, it is the same as the second time.

Example 4. A fourth embodiment of the present invention will be described with reference to the drawings. The circuit configuration is shown for the same case as the third embodiment, and the basic operation is as described above.

Next, the operation of this embodiment will be described.
FIG. 11 shows the integral term data G2 of the PI control, which corresponds to the load amount of the motor. FIG. 12 and FIG. 13 show changes over time in the motor speed at this time by controlling the motor speed to the target speed and repeating the operation / stop at regular time intervals. FIG. 12 shows a temporal change in the motor rotation speed when the initial value of the integral term data G2 is set to zero. As described above, it takes a long time to reach the target rotation speed at the first startup. turn into. 13 is the same as FIG.
When the motor load amount is high, A1 is set to the initial value of the integral term data G2, and the temporal change of the motor rotation speed at this time is shown. As described above, it is possible to shorten the time required to reach the target rotation speed at the time of the first activation. In this way, by giving the integral term data G2 an initial value other than zero according to the amount of load on the motor, it is possible to shorten the time required to reach the target rotation speed at the first motor startup. In the case of a washing machine, washing can be surely performed from the first start.

Example 5. A fifth embodiment of the present invention will be described with reference to the drawings. The circuit configuration is shown for the same case as the third embodiment, and the basic operation is as described above.

Next, the operation of this embodiment will be described.
FIG. 14 shows the integral term data G2 of the PI control, which corresponds to the motor target rotation speed. FIG. 15 and FIG. 16 show changes over time in the motor rotation speed at the time when the control is performed so that the target rotation speed is reached and the operation / stop is repeated at regular time intervals. FIG. 15 shows a temporal change in the motor rotation speed when the initial value of the integral term data G2 is set to zero, and as described above, the time required to reach the target rotation speed N1 or N2 at the first start-up. It will be long. Figure 1
6 shows B1 or B2 as the initial value of the integral term data G2 when the motor target rotation speed in FIG. 14 is N1 or N2, and shows the temporal change of the motor rotation speed at this time. As described above, it is possible to shorten the time required to reach the target rotation speed at the time of initial activation. In this way, by giving the integral term data G2 an initial value other than zero according to the motor target rotation speed, it is possible to shorten the time required to reach the target rotation speed at the first motor startup. Although the above description is based on the load amount of the motor, naturally, this also includes the moment of inertia of the motor and the torque of the load. The target rotation speed at the time of starting the washing machine will be described.
In order to generate a water flow in the washing of the washing machine, the rotary vanes in the washing tub driven by the motor are rotated. Normally, the motor is not controlled at a variable speed, so normal rotation and reverse rotation are repeated at the maximum rotation speed. According to the present invention, the speed of the motor is made variable, and the water flow is generated at a rotation speed lower than the maximum rotation speed. This is washed with a weak stream of water that causes pain such as wool. In order to generate this weak water flow, the rotation speed of the motor is made lower than the maximum rotation speed by phase control. The low rotation speed at this time becomes the target rotation speed. In the case of the washing machine of the present invention, if the target is set, the washing can be surely performed from the first start-up in any state.

Example 6. A sixth embodiment of the present invention will be described with reference to the drawings. The circuit configuration is shown for the same case as the first embodiment, and the basic operation is as described above.

Next, the operation of this embodiment will be described.
FIG. 17 temporally shows the relationship between the zero-cross signal output from the zero-cross detection circuit 11 and the trigger pulse signal 9 output from the trigger pulse generation circuit 8 with a delay of twx time from the zero-cross signal. Here, when the motor rotation speed matches the target rotation speed and the rotation speed stabilizes,
The trigger pulse signal 9 is output after a certain time delay from the zero-cross signal. At this time, the torque ripple of the motor has a constant frequency, and so does the vibration of the motor. At this time, a specific magnetic sound or noise due to vibration is generated from the motor or a device equipped with the motor. Generally, the noise spectrum at this time is an integral multiple of the power supply frequency.

Therefore, when the motor rotation speed matches the target rotation speed and the rotation speed is stable, the output timing of the trigger pulse signal 9 is varied by the phase control before and after the stable timing as shown in equation (5). Make it The average value of twx here coincides with the timing when the rotation speed of the motor is stable. Here, the stable rotation speed refers to the rotation speed of the motor when the target rotation speed is reached and there is no large rotation fluctuation. In the other embodiment, the rotation speed of the motor in the other embodiment is the set rotation speed Ns. (Average of twx) = (Σtwx) / N (5) where twx is the time from the zero-cross signal to the generation of the trigger pulse signal, N is the number of pulse outputs. The method of varying the variation is, for example, as shown in FIG. Alternatively, a normal distribution may be used, or a random value may be generated as shown in FIG. This is stored in the memory unit of the microcomputer so that twx has the normal distribution shown in FIG. 18 or the uniform distribution shown in FIG. 19, and twx is varied. By generating such a trigger pulse,
It is possible to change the torque generated by the motor and reduce specific magnetic noise or noise caused by vibration that is offensive to the ear. The average of the target and the average of the variations do not have to be completely the same, but the difference between the two is the difference between the target rotation speed and the actual rotation speed of the motor, and therefore it is necessary that the both substantially match. Therefore, in a washing machine, matching is necessary within a few seconds depending on time. Here, the case is shown in which the target rotation speed matches the specific target rotation speed, but when there is no target rotation speed in particular, this technique may be used as a countermeasure against a specific frequency, for example. In the washing machine, by carrying out this method, it is possible to obtain a quiet washing machine and eliminate the discomfort caused by the noise of the user.

Example 7. A seventh embodiment of the present invention will be described with reference to the drawings. The circuit configuration is shown for the same case as the first embodiment, and the basic operation is as described above.

Next, the operation of this embodiment will be described.
FIG. 20 shows a change over time of the motor rotation speed, and Nmax in the drawing shows the rotation speed that satisfies the condition of the following expression (6). N60min>Nmax> N50max (6) N60min is the power supply frequency of 60 Hz, the minimum rotation speed N50max including the voltage fluctuation component is the power supply frequency of 50 Hz, and the maximum rotation speed including the voltage fluctuation component In the circuit of FIG. 1 and FIG. Now, in the phase control, the rotation speed of the single-phase induction motor 2 is controlled to be the same rotation speed regardless of the power supply frequency (section t1 in FIG. 20). Power frequency is 6
At 0 Hz, when the output from the rotation speed detector 4 becomes a failure such that the rotation speed becomes equal to zero, the microcomputer 7 increases the duty ratio of the triac in order to accelerate the single-phase induction motor, and finally The current is 100% energized. At this time, the condition of the expression (6) is satisfied. Therefore, if the microcomputer 7 continues to be energized at 100% for an arbitrary time (section t2 in FIG. 20), the rotation speed Nma
The rotation speed is higher than x, and it is determined that the rotation speed is abnormal, and a signal for stopping the generation of the trigger pulse is sent to the trigger pulse generation circuit 8 to stop the triac and the single-phase induction motor 2
Is stopped (section t3 in FIG. 20). It should be noted that the microcomputer 7 uses the rotation speed command signal 10 and the rotation speed signal 6
1 to determine the phase control (trigger timing) in
The microcomputer 7 recognizes the energization of 00%.
From the arc control position of the phase control, the trigger timing is immediately after the input of the zero-cross signal, so it can be determined by applying the voltage equivalent to the power supply to the motor. In the flowchart, since the turning position of the triac is determined in step 4 of FIG. 6, it is possible to determine 100% energization in this step. The timer can measure time by using the internal timer of the microcomputer 7.

FIG. 23 shows the structure of the washing machine. 46 is a washing machine main body, 44 is a water absorption hose that absorbs water from a water supply, 45
Is a water injection port, 54 is a water absorption valve connected between the water absorption hose and the water injection port 45, 52 is a washing tub, 53 is a supporting rod for supporting the washing tub 52, and 51 is a discharge hose for discharging the water in the washing tub 52. , 50 is a drain valve connected between the drain hose and the washing tub 52, 55 is a rotating shaft connected to the washing tub, 47 is a motor, 49 is a pulley connected to the rotating shaft 55, and 48 is power of the motor 47. Is a belt that conveys to the pulley 49. Here, in the case of a washing machine, if phase control is used to share the power supply frequency in the 50/60 Hz area, the usage in the 60 Hz area is 5% when 100% energized due to a circuit failure or the like.
It may exceed the maximum speed in the 0 Hz area and reach an abnormal speed. At this time, the shaking of the washing tub becomes large and the safety function is activated to stop the washing. The user remains unclear as to the cause of circuit breakdown and the like. 100% energization refers to a state in which the motor is directly connected to a power supply and the motor is rotating, and in phase control, the trigger generation timing is a state in which it is delayed by 0 msec from the zero-cross signal. 100% energization due to occurrence of rotation failure or the like here means that the triac drive trigger generation timing is delayed from the zero-cross signal (for example, 5 mse.
c), 100% of the above due to short circuit failure of TRIAC
It means the same state as energization. However, by using the method shown in this embodiment, a large shaking of the dehydration tank can be prevented in advance, and the user can be notified of the details by displaying the cause in the control circuit. This allows
It can prevent the user from repeatedly using it,
Since the cause is clear, the repair time during service can be shortened.

Example 8. Embodiment 8 of the present invention will be described with reference to the drawings. In FIG. 21, 1 is a commercial power supply, 2 is a single-phase induction motor, 3 is a capacitor, 4 is a rotation speed detector that detects the rotation speed of the single-phase induction motor 2, and 6 is a rotation speed detector 4.
The rotational speed signals output from the AC drive unit 38a and 38b are relay drive circuits and relay contacts that stop the energization of the AC power supply 1 to the single-phase induction motor 2, and 37 is the current flowing from the AC power supply 1 to the single-phase induction motor 2. 39 is a current detection resistor for measuring the voltage across the current detection resistor 37, 12a and 12b are triacs for energizing the main winding and the auxiliary winding of the single-phase induction motor 2, and 9a.
Is a triac drive signal for driving the triac 12a, 9b is a triac drive signal for driving the triac 12b, 11 is a zero-cross detection circuit for detecting the zero-cross of the AC power supply 1, 7 is a microcomputer, and the rotational speed signal 6 and the zero-cross detection circuit 11 are provided. And current detector 39
Input the output signal from. Reference numeral 8 is a trigger pulse generating circuit for driving the triac 12 with a signal from the microcomputer 7, and 5 is a microcomputer 7, a trigger pulse generating circuit 8, a zero-cross detection circuit 11, a relay drive circuit 38a, and a current detection unit 39. It is a control circuit.

Next, the operation of FIG. 21 will be described. The microcomputer 7 determines the drive timing of the triac 12 for controlling to the target rotation speed based on the signals from the zero cross detection circuit 11 and the speed detector 4, and outputs the timing signal to the trigger pulse generation circuit 8. . A driving pulse signal is output from the trigger pulse generation circuit 8 to the triac 12, the triac 12 is turned on, and the single-phase induction motor 2 is rotated. The rotation speed of the single-phase induction motor 2 is detected by the rotation speed detector 4, and the rotation speed signal 6 is output to the microcomputer 7. Here, the drive timing of the triac 12 is calculated by the microcomputer 7 so as to match the target rotation speed, and feedback control by phase control is performed. The triac 12a is for forward rotation, and 12b is for reverse rotation.

Next, the operation of this embodiment will be described.
FIG. 22 shows changes in the motor rotation speed with time, and Nmax in the drawing shows the rotation speed that satisfies the condition of the above-mentioned equation (6). In the circuit of FIG. 21 and FIG. 22, the number of revolutions of the single-phase induction motor 2 is now controlled by the phase control to the same number of revolutions regardless of the power supply frequency (section t1 in FIG. 22).
When the power supply frequency is 60 Hz, and the motor is 100% energized due to an ON failure of the triac or other failures (section t2 in FIG. 22), the rotation speed detector 4 detects the rotation speed at this time, The rotation speed signal 6 is output to the microcomputer 7. Next, the microcomputer 7 recognizes that the rotation speed is higher than the rotation speed Nmax, and determines that the rotation speed is abnormal. Further, a signal for stopping the generation of the trigger pulse is sent to the trigger pulse generation circuit 8, the triac is stopped, and the single-phase induction motor 2 is stopped (FIG. 22).
T3 section).

The voltage across the current detection resistor 37 is detected (3
9) What to do and the fact that 100% energization is found by the microcomputer, and the motor continues to stop when the output signal stops when there is a failure that keeps the triac on (failure such as rotation speed detection). If the triac turns on, the relay contact 38b is opened. Here, in the case of a washing machine, if phase control is used to share the power supply frequency in the 50/60 Hz area, the use in the 60 Hz area will cause 1 circuit failure.
At the time of energization of 00%, it may exceed the maximum rotation speed in the 50 Hz area and reach an abnormal rotation speed. At this time,
The shaking of the washing tub increases and the safety function operates to stop washing. The user remains unclear as to the cause of circuit breakdown and the like. However, by using the method shown in this embodiment, it is possible to judge whether the relay has operated or stopped and display the cause of the failure, so that a large shaking of the dehydration tank can be prevented in advance, and the cause can be controlled by the control circuit. The details can be notified to the user by displaying in. This allows
It can prevent the user from repeatedly using it,
Since the cause is clear, the repair time during service can be shortened. The following examples can be considered for such a circuit failure.・ 100% energization due to a short-circuit failure of the TRIAC ・ A failure of the rotation speed detector generates the same signal as when the motor is not rotating from the rotation speed detector ・ A failure of the trigger pulse generation circuit Generate a signal that keeps driving the triac. Generate a signal that keeps driving the triac due to a failure in the output port of the microcomputer. In this way, 100% of the current will be energized due to the circuit failure, and the rotation speed of the arbitrary motor will be detected to cause abnormal rotation. When the number reaches the limit, it is possible to surely prevent the defect by stopping energization and stopping the motor drive. The display of the seventh and eighth embodiments may be performed in a place visible to the user such as the operation unit. Since this display indicates that the washing machine is out of order, the end user is informed that the washing machine cannot be used during the repair. For example, "service", "check", etc. are displayed. "Circuit error" is displayed.

The zero-cross detection circuit 11 is the same as that of the seventh embodiment, its operation is as described above, and the structure for outputting the triac drive pulse of the first embodiment and the phase control of the second embodiment are controlled. Configuration, Examples 3, 4,
FIG. 21 shows the configuration for controlling the rotation speed by the PI control of No. 5, the configuration for controlling the phase of the sixth embodiment, the configuration for controlling the phase of the seventh embodiment, and the configuration for controlling the phase of the eleventh embodiment.

Example 9. Embodiment 9 of the present invention will be described with reference to the drawings. The circuit configuration is shown for the same case as the eighth embodiment, and the basic operation is as described above.

FIG. 24 shows the rotational speed of the single-phase induction motor 2 and the current flowing through the single-phase induction motor 2 at that time with respect to time. No in the figure is the number of rotations in the steady state,
The current value flowing at this time is indicated by Io. Nmin is the minimum rotation speed in the actual use state, and it is determined that the motor is stopped below this rotation speed, for example, 10% of the maximum rotation speed. Imax represents a current value flowing in the single-phase induction motor 2 when the triacs 12a and 12b are turned on at the same time. Now, the triac 12a is turned on and the single-phase induction motor rotates at the number of revolutions No.
The current o is flowing (section t1 in FIG. 24). here,
When the other triac 12b has an ON failure, the motor rotation speed gradually decreases to Nmin rotations or less. The current value at this time increases to Imax. When the rotation speed Nmin or less and the current value Imax has elapsed for t2 hours, the microcomputer 7 determines that the triac 12b is in an on-failure, outputs a stop signal to the trigger pulse generation circuit 8, and outputs the trigger signal 9a to the triac 12a. Stop. Further, the relay drive signal is transmitted to the relay drive circuit 38a, the relay contact 38b is opened, and the energization of the single-phase induction motor 2 and the triac 12 is stopped. Where t
Two hours is, for example, shorter than the time when the thermal fuses are blown by the temperature rise of the motor when the triacs 12a and 12b are simultaneously energized.

FIG. 25 shows the procedure of this protection operation. After the triac is turned on (step 1), it is judged whether the current is within the limit value (step 2), it is judged as normal (step 3), and if it exceeds the limit value, the time in the Imax state is measured (step 4) When the time exceeds a predetermined value, the triac is turned off (step 5). The idea of a predetermined value for this time is that when the triac for forward / reverse rotation is turned on at the same time, element damage due to abnormal heating of the triac, overheat of the substrate, etc., or wire breakage due to motor temperature rise, etc. It is within the time that it does not reach, and stopping within several tens of seconds is a realistic numerical value. In the case of a washing machine, if the diagnosis and protection functions as described above are not provided, an overcurrent to the motor causes the temperature of the motor to rise, and the thermal fuse is blown. Such a situation can be prevented by providing the above-mentioned diagnosis and protection function, and the repair becomes simple because only the control circuit is provided.

Example 10. Embodiment 10 of the present invention is shown in FIG.
6, 27. The circuit configuration is shown for the same case as the ninth embodiment, and the basic operation is as described above.

The operation of this embodiment will be described below with reference to FIG. FIG. 26 shows the on / off timing of the triacs 12a and 12b and the current detection resistor 3 at that time.
7 is a graph showing a change with time of the current value flowing through 7.
The current value Io indicates the current flowing through the current detection resistor 37 when either the triac 12a or 12b is turned on. Imax is the single-phase induction motor 2 and the current detection resistor 37 when the triacs 12a and 12b are turned on at the same time.
Indicates the value of the current flowing through. First, from the microcomputer 7 to the trigger pulse generation circuit 8, the triac 1
The stop signals of 2a and 12b are output for t1 time (step 1). At this time, the microcomputer 7 confirms that no current flows in the current detection resistor 37 (step 2), and recognizes that both triacs are not in the on-failure.

If both triacs are not on-failure, then the microcomputer 7 outputs the on-signal of the triac 12a to the trigger pulse generating circuit 8 for t2 time (step 3). At this time, the microcomputer 7 confirms that the current Io flows through the current detection resistor 37, and recognizes that the triac 12a does not have an off failure (step 4). If the triac 12a is not in the off failure, then the microcomputer 7 sends the trigger pulse generating circuit 8 an on signal of the triac 12b for t3.
Output time. At this time, by confirming that the current Io flows from the microcomputer 7 to the current detection resistor 37, it is recognized that the triac 12b does not have an off failure (steps 5 to 7). During the failure verification, the current is Ima
When x is reached, it is determined that the triac 12a or 12b has a short circuit failure, and a stop signal is output to the trigger pulse generation circuit 8 to stop the trigger signal 9 of the triac 12. Furthermore, a relay drive signal is transmitted to the relay drive circuit 38a, the relay contact 38b is opened, and the single-phase induction motor 2
Also, the power supply to the triac 12 is stopped (step 8)
-10). With the above failure diagnosis, it is possible to detect the ON or OFF failure of the triac 12. In the case of a washing machine, if the diagnosis and protection functions as described above are not provided, an overcurrent to the motor causes the temperature of the motor to rise, and the thermal fuse is blown. Such a situation can be prevented by providing the above-mentioned diagnosis and protection function, and the repair becomes simple because only the control circuit is provided.

Example 11. An eleventh embodiment of the present invention will be described with reference to the drawings. In FIG. 28, 1 is a commercial power source, 2 is a single-phase induction motor, 3 is a capacitor, 12a is a triac for energizing the forward rotation side winding of the single-phase induction motor 2, and 12b is energization for the reverse rotation side winding. Triac to be performed, 9a is a triac drive pulse signal for forward rotation of the single-phase induction motor 2 that drives the triac 12a, and 9b is a triac 12b.
A triac drive pulse signal for reverse rotation of the single-phase induction motor 2 for driving the motor, 7 is a microcomputer, and 40 is a signal output from the microcomputer 7 to the triac 12a.
Forward / reverse switching signal for switching the power supply to 12 and 12b, 4
Reference numeral 1 is a timing signal that determines the generation timing of the pulses that are output from the microcomputer 7 and that drives the triacs 12a and 12b. Reference numeral 8 is a forward / reverse switching signal 40 and a timing signal 41 from the microcomputer 7.
Is a trigger pulse generation circuit 5 which outputs the triac drive signals 9a and 9b and is a control circuit composed of a microcomputer 7 and a trigger pulse generation circuit 8. That is, the microcomputer 7 has an output port for determining the power supply timing to the main coil and the auxiliary coil of the motor, and an output port for switching the power supply to the main coil and the auxiliary coil, and transmits the signal via the timing signal. This eliminates the timing of simultaneous energization of the main coil and the auxiliary coil.

FIG. 30 shows a conventional control circuit. Reference numeral 7 is a microcomputer, 42 is a forward rotation timing signal output from the microcomputer 7 to set the energization timing to the triac 12a, and 43 is a reverse rotation timing signal output from the microcomputer 7 to set the energization timing to the triac 12b. , 8 are trigger pulse generation circuits for inputting the normal rotation timing signal 42 and the reverse rotation timing signal 43 from the microcomputer and outputting the triac drive signals 9a and 9b.
Is a control circuit including a microcomputer 7 and a trigger pulse generation circuit 8. That is, the microcomputer is provided with each output port that determines the timing of energization of the main coil and the auxiliary coil of the motor, and sends a signal through each wiring.

Next, the operation of this embodiment will be described.
FIG. 29 shows a forward / reverse rotation switching signal 40, a timing signal 41,
It is a timing diagram which shows the time relationship of the motor current I which flows through the winding on the normal rotation side and the reverse rotation side. In FIG. 28, when the single-phase induction motor 2 is rotated in the forward rotation direction, the microcomputer 7 outputs a forward / reverse rotation switching signal 40 to the trigger pulse generation circuit 8. The forward / reverse switching signal at this time is shown in FIG.
As shown in 9, it becomes Hi. Next, the drive timing of the triac 12 is determined, the timing signal 41 is output, the trigger pulse generating circuit 8 outputs the triac drive pulse signal 9a to the triac 12a, and the timing signal shown in FIG. 29 is output in pulses. . The triac 12a is turned on, and the single-phase induction motor 2 rotates forward. The forward rotation side current of the motor at this time flows as shown in FIG.

When the single-phase induction motor 2 is rotated in the reverse rotation direction, the microcomputer 7 causes the forward / reverse rotation switching signal 4
0 is output to the trigger pulse generation circuit 8. The forward / reverse switching signal 40 at this time becomes Lo as shown in FIG. Next, the drive timing of the triac 12 is determined, the timing signal 41 is output, and the triac drive pulse signal 9b is output from the trigger pulse generation circuit 8 to the triac 12b.
Is output, and the timing signal shown in FIG. 29 is output in pulses. The triac 12b turns on and the single-phase induction motor 2 rotates in the reverse direction. The reverse rotation side current of the motor at this time flows as shown in FIG.

Next, the operation of the conventional embodiment shown in FIG. 30 will be described. FIG. 31 is a timing chart showing the time relationship of the forward rotation timing signal 42, the reverse rotation timing signal 43, and the waveforms of the currents flowing through the forward and reverse windings. According to FIG. 30, when the single-phase induction motor 2 is rotated in the normal rotation direction, the microcomputer 7 determines the drive timing of the triac 12a and outputs the normal rotation timing signal 42 to the trigger pulse generation circuit 8. Next, the trigger pulse generation circuit 8 outputs the triac drive pulse signal 9a to the triac 12a, the timing signal shown in FIG. 31 is output in pulses, the triac 12a is turned on, and the single-phase induction motor 2 is normally rotated. . The forward rotation side current of the motor at this time flows as shown in FIG.

When the single-phase induction motor 2 is rotated in the reverse direction, the microcomputer 7 uses the triac 12b.
Drive timing is determined, and the reverse rotation timing signal 43
Is output to the trigger pulse generation circuit 8. Next, the trigger pulse generation circuit 8 outputs the triac drive pulse signal 9b to the triac 12b, the timing signal shown in FIG. 31 is output in pulses, the triac 12b is turned on, and the single-phase induction motor 2 rotates in the reverse direction. . The reverse rotation current of the motor at this time flows as shown in FIG.

Here, in the case of the conventional circuit configuration shown in FIG. 30, the output port of the microcomputer 7 often keeps Hi or Lo when a runaway or the like of the microcomputer 7 occurs. Now, when the output ports continue to be High at the same time, the trigger pulse generating circuit generates a signal for driving the triacs 12a and 12b at the same time, and an excessive current flows to the single-phase induction motor 2 to cause an abnormal temperature rise. There was a problem such as the thermal fuse inside was blown out.

However, in the case of the circuit configuration shown in FIG. 28, when the microcomputer 7 has runaway or the like, even if the output ports continue to be High at the same time, the trigger pulse generating circuit must generate a signal for driving the triac 12a. Therefore, unlike the conventional circuit configuration shown in FIG. 30, an excessive current flows to the single-phase induction motor 2 to cause an abnormal temperature rise, and the temperature fuse in the motor is not blown out. Conversely, even if the output ports continue to be Lo at the same time, there is no simultaneous ON. The procedure of this protection described above is shown in FIG. 32 (steps 1 to 5). Both triacs are not turned on at the same time Hi or Lo of the microcomputer port. In the case of a washing machine, if the above-mentioned function is not provided, the temperature of the motor rises due to the overcurrent to the motor, and the thermal fuse is blown. By providing the above-mentioned function, such a situation can be prevented, and the repair is simplified by only the thermal fuse. Further, the display may be provided as described above.

[0090]

As described above, according to the present invention, the output timing of the drive pulse signal for energizing the motor is
When the speed is controlled to the target speed, it is made to vary before and after the target output timing time, so the vibration frequency will also fluctuate due to the fluctuation of the torque ripple of the motor, preventing the generation of specific jarring noise. It becomes possible to do. Further, the present invention can be used for a wide range of purposes without affecting the use of the device using the motor because the average of the output timings substantially matches the target value.

Further, according to the present invention, the output timing of the driving pulse signal for energizing the motor is calculated by normalizing the time between the power source zero cross signals and using the normalized data. Even if the power supply frequency is different, it can be processed by the same routine in the microcomputer, so that the program and the calculation time can be shortened. Further, the present invention is always normalized so that even if the power is suddenly switched, it is possible to deal with it without any operation.

[0092]

[0093]

[0094]

[0095]

[0096]

[0097]

[0098]

[0099]

[0100]

[0101]

The present invention also provides a washing machine equipped with a control device which is reliable and has excellent starting characteristics.

[0103]

[Brief description of drawings]

FIG. 1 is a block diagram showing a control device for a single-phase induction motor according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a triac firing timing and a motor voltage and current in the phase control of the present invention.

FIG. 3 is an explanatory diagram showing a triac firing timing and a motor voltage and current in the phase control of the present invention.

FIG. 4 is an explanatory diagram showing a triac firing timing and a motor voltage and current in the phase control of the present invention.

FIG. 5 is a flowchart showing a procedure for determining a pulse width according to the present invention.

FIG. 6 is a flowchart showing a triac firing position calculation routine of the present invention.

FIG. 7 is a flow chart showing the procedure of zero-cross signal time measurement according to the present invention.

FIG. 8 is a flowchart showing a procedure of power supply frequency discrimination according to the present invention.

FIG. 9 is a motor control block diagram according to PI control of the present invention.

FIG. 10 is a flow chart showing a PI control calculation routine of the present invention.

FIG. 11 shows integral term data of PI control according to the load amount of the motor of the present invention.

FIG. 12 is an explanatory diagram showing a motor rotating state when the integral term of PI control of the present invention is set to zero.

FIG. 13 is an explanatory diagram showing a motor rotation state when an initial value other than zero is set in the integral term of PI control of the present invention.

FIG. 14 shows P according to a target rotation speed of the motor of the present invention.
It is explanatory drawing which shows the integral term data of I control.

FIG. 15 is an explanatory diagram showing a motor rotating state when the integral term of PI control of the present invention is set to zero.

FIG. 16 is an explanatory diagram showing a motor rotation state when an initial value other than zero is set in the integral term of PI control of the present invention.

FIG. 17 is an explanatory diagram showing the output timing of the power supply zero-cross signal and the triac drive pulse signal of the present invention.

FIG. 18 is an explanatory diagram showing a time distribution from the power supply zero-cross signal to the output of the triac drive pulse signal of the present invention.

FIG. 19 is an explanatory diagram showing a time distribution from the power supply zero-cross signal to the output of the triac drive pulse signal of the present invention.

FIG. 20 is an explanatory diagram showing a temporal change in the motor rotation speed according to the present invention.

FIG. 21 is a block diagram showing a control device for a single-phase induction motor according to an embodiment of the present invention.

FIG. 22 is an explanatory diagram showing a temporal change in the motor rotation speed according to the present invention.

FIG. 23 is a structural view showing the structure of the washing machine of the present invention.

FIG. 24 is an explanatory diagram showing temporal changes in motor rotation speed and current according to the present invention.

FIG. 25 is a flowchart showing the protection procedure of the present invention.

FIG. 26 is an explanatory diagram showing the on / off timing of the triac of the present invention and the temporal change of the motor current at that time.

FIG. 27 is a flowchart showing a protection procedure of the present invention.

FIG. 28 is a block diagram showing a control circuit of a single-phase induction motor according to an embodiment of the present invention.

FIG. 29 is an explanatory view showing the forward / reverse rotation switching signal of the motor of the present invention, the timing signal at the time of triac drive, and the temporal change of the current flowing through the motor.

FIG. 30 is a block diagram showing a control circuit of a conventional single-phase induction motor.

FIG. 31 is an explanatory diagram showing a time-dependent change of a conventional triac driving timing signal for rotating the motor forward or reverse and a current flowing through the motor.

FIG. 32 is a flowchart showing the protection procedure of the present invention.

FIG. 33 is a block diagram showing a conventional controller for a single-phase induction motor.

[Explanation of symbols]

1 commercial power supply, 2 single-phase induction motor, 3 capacitor,
4 rotation speed detector, 5 control circuit, 6 zero cross detection circuit, 7 speed calculation unit, 8 trigger pulse generation circuit,
37 current detection resistor, 38b relay contact.

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-6-245574 (JP, A) JP-A-5-328720 (JP, A) Actual development Sho 63-191898 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) H02P 5/402 301 H02P 1/42

Claims (4)

(57) [Claims] 1. A motor, a rotation detecting means for detecting the speed of the motor, a motor driving means for controlling a phase by energizing a coil of the motor, and a zero-cross detecting means for detecting a zero-cross signal of a commercial power source. A speed calculation unit that calculates an output timing to the motor drive unit based on an output signal of the rotation speed detection unit and a speed command value and outputs a drive signal is output from the speed calculation unit to the motor drive unit. The output timing of the drive signal is varied around the target output timing time, and the output timing of this drive signal is changed.
Ming normalizes the time between consecutive power supply zero-crossing signals.
The motor control device is characterized in that the time is normalized and is determined by this normalized time . 2. The motor control device according to claim 1, wherein control is performed so that the target output timing time and an average value when the output timing time is varied back and forth are substantially equal to each other. 3. The motor control device according to claim 1, wherein the output timing of the drive signal is normalized during operation at all times. 4. A washing machine comprising at least one of the motor control devices according to claims 1 to 3 .