JPS6380177A - Method of starting motor - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for starting a motor that controls the operation of a controlled member in a refrigerator.

[Summary of the Invention] The present invention provides a method for starting a motor, in which when the motor does not start, the motor is heated for a certain period of time and then restarted, thereby reliably starting the motor even when the outside temperature is below a certain temperature. It is designed to start.

[Prior Art] For example, in a refrigerator equipped with a divided freezer compartment and a refrigerator compartment, cold air from a cooler is opened and closed using a damper provided in a passage using the rotational force of a motor to separate the freezing compartment or the refrigerator compartment. This kind of cold air control is shown in, for example, Japanese Utility Model Application No. 61-23673.

In such refrigerators, when the temperature inside the refrigerator reaches a predetermined level or higher, the motor is started and the damper is opened to send in cold air.When the temperature inside the refrigerator reaches a predetermined level or lower, the motor is started and the damper is closed to release the cold air. It is configured not to send . Therefore, the motor is controlled to open and close the damper after reaching a certain temperature, and works to keep the temperature inside the refrigerator room constant.

By the way, in such a refrigerator, since the temperature of the cold air from the cooler is very low, there is a risk that the motor will be cooled by this cold air and the motor will not start even if the motor starting switch is turned on. To prevent this, a method has been adopted in which a heater is installed near the motor and the area around the motor is constantly warmed to start the motor.

[Problems to be Solved by the Invention] However, such a method of starting the motor creates a contradiction in that the motor, which is originally used to control the opening and closing of the damper and send cold air into the refrigerator compartment, is heated by the heater. However, there are problems in that it is necessary to prepare a new heater and power consumption increases.

The present invention has been made in response to such problems, and an object of the present invention is to provide a method for starting a motor that can reliably start the motor without preparing a heater.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for starting a motor that controls the operation of a controlled member by energizing the motor. The motor is characterized in that when a state change is detected and no state change is detected for a predetermined period of time, the power supply to the motor is stopped.

[Operation] When a change in the state of a controlled member such as a damper is not detected for a predetermined period of time, the energization to the motor is stopped.Then, the energization to the motor is continued for a predetermined period of time and heating power is applied. This allows the motor to be restarted.

[Embodiments of the Invention] Fig. 1 shows a motor starting circuit used to carry out the motor starting method of the present invention, in which 1.9°11 is a resistor, 2
is a thermistor, 3 is a variable resistor, 4 is an A/D converter, 5 is a cam, 6 is a photocoupler, 8 is an MPU (arithmetic element),
10 is a reed switch, 19 is an AC motor, 20 is a power source for starting the motor, and 22 is a bias power source.

In the above configuration, the thermistor 2 is provided in the refrigerating compartment of the refrigerator to detect the room temperature, and applies a detection voltage Vt corresponding to the temperature to the A/D converter 4. In addition, the arbitrarily set voltage of the variable resistor 3 is A/
Add to D converter 4.

The A/D converter 4 converts the applied detection voltage Vt and reference voltage Vs into digital signals and outputs them to the MPU 8. M
PU8 is based on the reference voltage Vs.

Two types of voltages, namely voltage v1 corresponding to high temperature T1 and voltage v2 corresponding to low temperature T2, are set in advance, and detection voltage Vt applied via A/D converter 4
and the above V1. V, and outputs a control voltage from the terminal TY to control the photocoupler 6 in accordance with the voltage applied to the terminal Tx by the reed switch 10. The reed switch 10 is turned on depending on whether a damper (not shown) is opened or closed.

It is configured to be off-controlled, and is turned on when the damper is open and turned off when it is closed. reed switch 10
is controlled by the motor 19 via the cam 5, and the cam 5
It is configured so that it turns on and off once per rotation.

When the reed switch 10 is turned on, an L level signal (earth potential) is applied to the terminal Tx of the MPU 8, and when it is turned off, an H level signal (bias potential) is applied to the terminal Tx.

When an L level signal is applied to the terminal Tx when the reed switch 10 is off, the MPU 8 controls the terminal TY to be at the L level to turn on the photocoupler 6. MPU8
It also has two types of functions: an operation timer and a heating timer. The operation timer is for checking whether the motor 19 has started within a predetermined time, and the heating timer is for setting the time for heating the motor 19. It is for the purpose of

When the photocoupler 6 is turned on by the L level signal output from the terminal TY of the MOU 8, the motor starting power source 20 is applied to the motor 19.

Next, the operation of this embodiment will be explained.

FIG. 2 is a flowchart showing the flow of the operation of the motor starting method according to the present embodiment, and FIG. 3 is a time chart showing signal waveforms in the flow. The following description will be made with reference to these two drawings.

The necessary operation program is stored in the MPU 8 in advance, and the MPU 8
starts the control action.

First, when the voltage Vt detected by the thermistor 2 is applied,
The MPU 8 performs a comparison operation with a high voltage V (that is, a high temperature T) of the two types of set voltages V□I Vt (block B). If the result is V t > V L (indoor temperature is above the specified temperature), the flow proceeds to block C, where it is determined whether the reed switch 10 is off (the damper is closed) or not. If it is vl, there is no problem, and the flow jumps to block E, which will be described later.

The same applies when the reed switch 10 is not turned off in block C (the damper is not opened and cold air is not sent in).

If the reed switch 10 is off, the process advances to block D and the motor 19 is turned on. This is because when an L level signal is applied to the terminal Tx of the MPU 8, an L level signal is output from the terminals T and Y, turning on the photocoupler 6, and as a result, the motor starting power source 20 is applied to the motor 19.

Next, in block E, the operation timer is started and it is determined whether or not the reed switch 1o is off (block F
).

If it is not off, block G confirms this.

If off, flow jumps to block Q and a determination is made whether the operational timer has expired. If the heating is finished, then the heating timer is started (block R).

If the operation timer has not expired, the flow returns to block F again.

Next, in block S, it is determined whether or not the reed switch 1o is off, and if it is off, the process proceeds to block T, where it is determined whether the heating timer has ended or not. If it is not off, the flow proceeds to block G after the off operation is performed in block P. If the heating timer has ended, the motor 19 is turned off (block U).

If not, the flow returns to block S again.

After the motor is turned off, a delay operation is performed in block V, and the flow returns to block D again.

After block G, the operation timer is turned off (block H).

With the above, the comparison operation between Vt and V-work is completed, and Vt>
In other words, when the detected temperature is equal to or higher than the high temperature setting temperature T8, an operation is performed to start the operation timer and lower the detected temperature.

Next, a comparison operation between Vt and v2 is performed in the same manner (block I).
Then, it is determined whether the reed switch 10 is on or not. If vt>v□, the flow jumps to block ○. The same applies when the reed switch 10 is not on. If it is on, the motor 19 is turned on (block K), and then the operation timer is started (block L). Reed switch 1 in block M
It is determined whether or not 0 is on, and if it is not on, the motor 19 is turned off (block N). If it is on, proceed to block a in large block W.

A determination is made whether the operational timer has expired.

If it has ended, the heating timer is started (block b). If the operation timer has not expired, the process returns to block M again. Next, in block C, it is determined whether the reed switch 1o is on. If it is on, it is determined in block e whether or not the heating timer has ended. Block d if not on
After the heating timer is turned off, the process returns to block N. When the heating timer ends, motor 1
After the OFF operation of 9 is performed (block f) and the delay operation is performed (block g), the process returns to the block.

If the heating timer has not ended, the process returns to block N again.

When the motor 19 is turned off in block N, the operation timer is turned off first in block ○, and then the flow returns to block B again.

As described above, a comparison operation between Vt and v2 is performed, and Vt
<V2, that is, when the detected temperature is lower than the low temperature set temperature T2, an operation such as starting a heating timer to heat the motor 19 is performed. That is, if the motor 19 does not start even after starting the operation timer, the heating timer is started.

The time chart in FIG. 3 shows changes in signal waveforms corresponding to the flow chart in FIG.

At τ, a comparison is made between Vt and V-work, and by starting the motor 19 until τ2, the damper is gradually opened via the cam 5.

Similarly, a comparison is made between Vt and v2. In this case, the operation timer C until τ; Therefore, if the motor 19 does not start even if the motor starting power supply 20 is applied, the motor 19 is heated by the motor starting power supply 20 by the heating timer from τ to τ5, and thereafter, the motor 19 is heated by the motor starting power supply 20. After stopping the application of the motor starting power source 20 until then, the motor is restarted. As a result, even if the outside air temperature is below a certain temperature, the motor 19 is heated above the certain temperature and can be started. When the motor 19 starts, the damper is gradually closed. When the motor 19 does not start, the same operation is repeated again. When the motor 19 is started, the motor 19 is stopped at a predetermined position after confirming whether the reed switch 10 is on or off.

In this way, according to the embodiment of the present invention, if the motor 19 does not start, the heating power is applied and the motor 19 is heated for a certain period of time and then restarted, so that it can be reliably started even when the outside temperature is low. .

Moreover, there is no need for a heater, and the power supply for starting the motor can be used directly for heating, so there is no need for a special power supply.
Furthermore, there is no need to use an expensive motor.

Although each component in the embodiment has been described as being limited, various modifications such as first-order modifications are possible.

1. The motor 19 is a DC motor, a step motor, etc., and is combined with a DC power source.

2. If the motor 19 does not start even after operating the heating timer several times, the power supply is stopped and a failure message indicating that the motor 19 does not start is displayed.

3. Set the heating timer for a long time so that if the reed switch 10 does not turn over within this time, 1 electrification is stopped and a failure is displayed.

[Effects of the Invention] As described above, according to the present invention, when the motor does not start, the motor is heated for a certain period of time and then restarted, so that the outside temperature can be lowered below a certain temperature without using a heater. The motor can be reliably started even when

[Brief explanation of the drawing]

FIG. 1 is a motor starting circuit diagram used to implement the present invention;
FIG. 2 is a flowchart explaining the invention in detail;
The figure is a time chart explaining the present invention in detail. 2...Thermistor. 4...A/D converter, 5...Cam, 6...Photocoupler. 8...MPU (arithmetic element) 10...Reed switch, 19...Motor, 20...Power source for motor starting, wE2 Figure 2 (b) January/2, 1985

Claims (2)

[Claims] (1) In a motor starting method that controls the operation of a controlled member by energizing the motor, a change in the state of the controlled member is detected after the motor is energized, and if no change in state is detected for a predetermined period of time, the motor is A method for starting a motor, characterized by stopping energization. (2) A method for starting a motor according to claim 1, wherein the motor is de-energized and then re-energized after a certain period of time.