KR100904238B1 - Apparatus and method for controlling motor of electric cooker - Google Patents

Abstract

The motor control of the electric rice cooker according to the present invention, if the cooking operation of the electric rice cooker including soaking, cooking, and moxibustion process is performed, so that the rotational speed of the motor is changed according to the temperature set for each soaking, cooking and moxibustion process, Or by varying the rotational speed of the motor according to the time set for each of the soaking, cooking and moxibustion process, it is possible to prevent the generation of unnecessary noise and power consumption in the cooking process.

Rice Cooker, Noise Control, PWM Control

Description

Motor control device and method of electric rice cooker {APPARATUS AND METHOD FOR CONTROLLING MOTOR OF ELECTRIC COOKER}

The present invention relates to a motor control of an electric rice cooker, and more particularly, by controlling the current applied to the motor according to the cooking process to control the rotational speed of the motor to prevent unnecessary noise, and improve the power consumption of the rice cooker Relates to motor control.

An electric rice cooker is a cooking utensil for cooking food in a short time by heating a pot in an enclosed space with an electric heater. In general, an electric rice cooker is provided with cooking conditions according to each content. After the cooking, each cooking is performed according to the operation of each cooking key.

The rice cooker is composed of an outer pot forming the outer surface of the rice cooker and the inner pot seated on the outer pot, a lid covering the rice cooker and a heater for heating the contents of the inner pot.

The configuration of the electric rice cooker, as shown in Figure 1 attached, consisting of a key input unit 12 consisting of keys for setting the various operating environment of the electric rice cooker having a cooking function and the warming function, and the bottom and body of the electric rice cooker and Operation of the rice cooker by the temperature sensor 14 installed on the lid and detecting the temperature generated by the various heaters, and the temperature value detected by the key input and the temperature sensor 14 inputted from the key input unit 12. Control unit 10 for outputting a signal to control the, and is installed on the bottom and the lid and the body of the electric pressure cooker and operates in accordance with the control signal output from the control unit 10 to heat the inside of the electric rice cooker ( 16), a display unit 18 for displaying the operation state of the electric rice cooker, and a fan and a motor for preventing the control unit 10 and the printed circuit board from being heated due to the heat generated when the heater unit 16 is driven.It consists of the fan motor drive part 20 provided.

In the conventional electric rice cooker, the place where the hot plate driven by the heater unit 16 is located is the bottom of the inner surface of the outer pot on which the inner pot is usually placed. In this case, when the inner pot is heated by the heater of the hot plate or heat is transferred to the inner pot by heat conduction, rice and water inside the inner pot are heated to cook.

Looking at the cooking process in the electric rice cooker configured as described above, as shown in Figure 2, when the control unit 10 puts the operating power to the electric cooker while maintaining the key input standby key for the user to cook It is detected whether or not the cooking mode setting key of the input unit 12 has been input.

At this time, when the cooking start key is detected from the key input unit 12, the control unit 10 proceeds with the cooking temperature of the electric rice cooker detected from the temperature sensor (12: cooking temperature detection temperature sensor installed on the bottom, the body, the lid) It is confirmed that, by supplying the operating power to the cooking heater, the lid heater and the body heater included in the heater unit 16 increases the internal temperature while the soaking process (t1) for the rice housed inside the rice cooker Proceed for a certain time.

When the process of the soaking process t1 is completed, the cooking temperature is determined while raising the initial temperature of the cooking process t2 to a preset threshold temperature, and the internal temperature is boiled by allocating calories based on the determined cooking amount. The temperature is raised to a predetermined threshold temperature at the initial stage of the maintenance process, and the cooking heater t2 is continuously heated while heating the cooking heater, the lid heater, and the body heater of the heater unit 16.

When the cooking process (t2) is finished, the moxibustion process (t3) proceeds, and when the moxibustion process (t3) is finished, all cooking processes are terminated and warming is performed.

In addition, in the conventional electric rice cooker, as shown in FIG. 3, when cooking is started, a constant current is controlled from the controller 10 so that the fan motor driving unit 20 can maintain the maximum rotational speed until the end of the moxibustion process t3. It is applied to the fan motor driver 20.

However, since a current is supplied to the fan motor driving unit 20 so as to maintain the maximum rotational speed from the initial stage of cooking of the rice cooker, there is a problem in that unnecessary power consumption occurs.

In addition, there is a problem that unnecessary noise occurs due to the rotation of the fan by maintaining the maximum rotational speed from the beginning of cooking rice cooker.

In order to solve the above problems, the present invention is to control the current applied to the fan motor drive unit according to the cooking step of the electric rice cooker to improve the unnecessary noise generated in the cooking process, and to improve the power consumption of the electric rice cooker motor control device and It is an object to provide a method.

In addition, the motor control of the present invention, when cooking operation of the electric rice cooker including soaking, cooking, and moxibustion process is performed, the electric rice cooker to control the rotational speed of the motor according to the temperature set for each soaking, cooking and moxibustion process An object of the present invention is to provide a motor control apparatus and method.

In addition, the motor control of the present invention is to provide a motor control apparatus and method for an electric rice cooker to control the rotational speed of the motor according to the time set for each soaking, cooking and moxibustion process.

In order to achieve the above object, the present invention provides a motor control apparatus for an electric rice cooker, comprising: a plurality of temperature sensors for detecting an internal temperature of the electric rice cooker; A controller configured to output a motor control signal such that a rotation speed of the motor is changed based on temperatures detected by the plurality of temperature sensors; And a fan motor driving unit including a fan and a motor, and configured to drive the fan and the motor according to a motor control signal output from the controller.

In addition, the present invention provides a motor control device for an electric rice cooker, comprising: a temperature sensor for detecting an inner pot temperature of the electric rice cooker; Outputting each cooking control signal to perform a soaking process, cooking process, and moxibustion process based on the temperature detected from the temperature sensor, and outputting a motor control signal so that the rotational speed of the motor is varied according to each cooking control signal. Control unit; And a fan motor driving unit including a fan and a motor, and configured to drive the fan and the motor according to a motor control signal output from the controller.

In addition, the present invention provides a motor control device for an electric rice cooker, comprising: a temperature sensor for detecting an inner pot temperature of the electric rice cooker; A timer for detecting a time until the temperature of the inner pot reaches a preset temperature; Outputs each cooking control signal to perform a soaking process, cooking process, and steaming process based on the inner pot temperature detected from the temperature sensor and the arrival time detected from the timer, and according to the cooking control signal, A controller for outputting a motor control signal such that the rotational speed is variable; And a fan motor driving unit including a fan and a motor, and configured to drive the fan and the motor according to a motor control signal output from the controller.

In addition, the present invention provides a motor control device for an electric rice cooker, comprising: a timer for detecting a time elapsed after the cooking operation of the electric rice cooker starts; A control unit which outputs a motor control signal so that the rotational speed of the motor varies according to the time detected from the timer; And a fan motor driving unit including a fan and a motor, and configured to drive the fan and the motor according to a motor control signal output from the controller.

In addition, the motor control signal is preferably a PWM signal.

In addition, the present invention is a motor control method of the electric rice cooker, when cooking operation of the electric rice cooker including soaking, cooking, and moxibustion process is performed, the motor is controlled to maintain a preset rotational speed for each soaking, cooking and moxibustion process Characterized in that.

In addition, the rotational speed is preferably to be varied according to the temperature set for each of the soaking, cooking and moxibustion process, or to vary according to the time set for each of the soaking, cooking and moxibustion process.

The motor control of the electric rice cooker according to the present invention, if the cooking operation of the electric rice cooker including soaking, cooking, and moxibustion process is performed, so that the rotational speed of the motor is changed according to the temperature set for each soaking, cooking and moxibustion process, Or by varying the rotational speed of the motor according to the time set for each of the soaking, cooking and moxibustion process, it is possible to prevent the generation of unnecessary noise and power consumption in the cooking process.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 4 is a block diagram showing the configuration of a motor control device for an electric rice cooker according to the present invention.

(First embodiment)

The motor control apparatus of the electric rice cooker according to the first embodiment of the present invention is provided with a key input unit 110 composed of keys for setting various operating environments of the electric rice cooker, the bottom and the body and the lid of the electric rice cooker, A temperature sensor 120 for detecting a temperature generated by the heat and a control signal for performing a cooking operation or a warming operation according to a key input input from the key input unit 110, and a temperature detected by the temperature sensor 120. The PWM control unit 100a outputs a motor control signal so that the rotational speed of the motor (not shown) varies according to the corresponding temperature value, and the PWM control unit 100a is installed at the bottom, the lid and the body of the rice cooker. Various heaters 140 for heating the inside of the rice cooker by operating according to the cooking control signal output from the display unit 150 for displaying the operation state of the rice cooker, and the heater 140 Fan motor driver 160 having a fan and a motor for blowing to prevent the PWM control unit 100a and the printed circuit board (not shown) from heating due to the heat generated during the driving.

The temperature sensor 120 detects a temperature inside the cooker set according to a key input value input through the key input unit 110 and transmits the detected temperature inside the cooker to the PWM controller 100a.

The PWM controller 100a outputs a motor control signal such that the fan motor driver 160 is driven at a preset rotation speed according to the internal temperature of the cooker detected by the temperature sensor 120.

That is, the PWM control unit 100a outputs a motor control signal such that the motor (not shown) rotates at low speed when the lower temperature of the cooker detected from the temperature sensor is the first reference temperature for low speed rotation determination, for example. When the detected lower temperature is the second reference temperature for determining the medium speed rotation, a motor control signal is output so that the motor (not shown) rotates at medium speed. When the detected lower temperature is the third reference temperature for determining the high speed rotation, the motor is operated at high speed. Output the motor control signal to rotate.

The motor control signal is output as a pulse width modulation (PWM) signal.

Therefore, by controlling the rotation speed of the motor in accordance with the temperature value detected from the temperature sensor 120 for detecting the internal temperature of the rice cooker, appropriate cooling can be made according to the amount of heat generated during cooking process, due to excessive rotation of the fan Noise generation and power consumption can be prevented.

(Second embodiment)

Figure 5 is a block diagram showing a second embodiment of the motor control apparatus of the rice cooker according to the present invention.

As shown in FIG. 5, the motor control apparatus for an electric rice cooker according to the second embodiment includes a key input unit 110 including keys for setting various operating environments of the electric rice cooker, and a temperature sensor for detecting an internal pot temperature of the electric rice cooker ( 120 and each cooking control signal is output so that a soaking process, cooking process, and steaming process are performed based on the temperature detected from the temperature sensor 120, and the rotational speed of the motor is varied according to each cooking control signal. PWM control unit 100b for outputting a motor control signal, and is installed on the bottom and the lid and the body of the rice cooker and operate in accordance with the cooking control signal output from the PWM control unit 100b to heat the inside of the rice cooker The PWM controller 100b and the printed circuit board (not shown) are heated by the heater unit 140, the display unit 150 displaying the operation state of the electric rice cooker, and the heat generated when the heater unit 140 is driven. It includes a fan motor drive unit 160 having a fan and a motor for blowing to prevent it.

That is, the motor control apparatus of the electric rice cooker according to the second embodiment controls the motor control signal applied to the fan motor driver 160 according to the cooking process based on the temperature detected from the temperature sensor 120.

When the execution of the cooking operation is input through the key input unit 110, the PWM controller 100b outputs an ON signal to the heater unit 140 according to a preset cooking process. The heater control signal is sequentially output to perform the soaking process t1 (see FIG. 2), the cooking process (t2, FIG. 2), and the moxibustion process (t3, FIG. 2). And outputting a motor control signal such that a fan and a motor (not shown) are rotated based on the temperature detected by the temperature sensor 120 when the control signal is output for each moxibustion process.

That is, when cooking is started, a soaking process t1 is performed in which the inner pot is heated to a predetermined temperature by the heater 140. Since the soaking process t1 is an initial cooking process with little noise, the PWM controller 100b outputs a low speed rotation signal to the fan motor driver 160 so that the fan and the motor (not shown) can rotate at low speed.

When the soaking process t1 is completed, the cooking process t2 is performed based on the temperature value detected by the temperature sensor 120, and the cooking process t2 is performed. At this time, noise caused by the rotation of the weight (not shown) is generated. In addition, since the heat generated from the heater unit 140 increases with this, the PWM controller 100b outputs a high speed rotation signal to the fan motor driver 160.

When the temperature detected from the temperature sensor 120 reaches a preset temperature, it is determined to be the end of the cooking process t2, and the moxibustion process t3 is performed. At this time, the rotation of the weight is terminated and the amount of noise is reduced, but the amount of heat generated is Many output motor control signals to enable low or medium speed rotation. At this time, the motor control signal is output as a PWM signal.

When the moxibustion process t3 is completed, the output of the motor control signal is terminated.

6 is a waveform diagram showing the waveform of the current applied when the motor of the electric rice cooker according to the present invention. As shown in FIG. 6, in the initial stage of the cooking process, that is, the soaking process t1, the on-time duty is shorter than the off-time duty so that the rotation speed RPM of the fan and the motor (not shown) is low. ) Is output, the signal D2 with the on-time duty always on is output in the cooking process t2 so that the maximum rotation is possible, and the signal D3 with the on-time duty longer than the off-time duty in the moxibustion process t3. By outputting the signal D4 having the same duty ratio) or the same, the rotational speed of the motor is possible according to the cooking process of the rice cooker, and the generation of unnecessary noise and power consumption of the cooking process can be prevented.

(Third embodiment)

7 is a block diagram showing a third embodiment of the motor control apparatus of the rice cooker according to the present invention.

As shown in FIG. 7, the motor control apparatus for an electric rice cooker according to the third embodiment includes a key input unit 110 including keys for setting various operating environments of the electric rice cooker, and a temperature sensor for detecting an internal pot temperature of the electric rice cooker ( 120, a timer 130 that detects a time until the temperature of the inner pot reaches a preset temperature, an inner pot temperature detected by the temperature sensor 120, and the arrival time detected by the timer 130. A control unit 100c for outputting each cooking control signal to perform a soaking process, cooking process and moxibustion process based on the control unit, and outputting a motor control signal so that the rotational speed of the motor is varied according to each cooking control signal; Installed on the bottom and the lid and the body of the rice cooker and operating in accordance with the cooking control signal output from the PWM control unit 100c and various heater unit 140 for heating the inside of the rice cooker, and the Fan and motor for blowing to prevent the PWM control unit 100c and the printed circuit board (not shown) from being heated by the display unit 150 displaying the operation state of the rice cooker and the heat generated when the heater 140 is driven. It includes a fan motor driver 160 having a.

The difference between the second embodiment and the third embodiment further includes a timer 130 that detects the time that proceeds for each of the soaking process, the cooking process, and the steaming process while performing the cooking process.

That is, when the cooking process starts, the PWM controller 100c counts the time of the soaking process, the cooking process and the moxibustion process through the timer 130, and controls the motor by the fan motor driving unit 160 during the counting time for each cooking process. Output the signal.

Therefore, in the soaking process, the on-time duty outputs a signal shorter than the off-time duty so that the rotational speed (RPM) of the fan and the motor (not shown) is low, and the on-time duty is set so that maximum rotation is possible in the cooking process. The on-time signal is outputted at all times, and the on-time duty is longer than the off-time duty or a signal having the same duty ratio is output. Thus, the rotation speed of the motor is possible according to the cooking process of the rice cooker. It is possible to prevent the generation of unnecessary noise and power consumption during cooking.

(Example 4)

8 is a block diagram showing a fourth embodiment of the motor control apparatus of the rice cooker according to the present invention.

As shown in FIG. 8, the motor control apparatus of the electric rice cooker according to the fourth embodiment includes a timer 130 for detecting a time that elapses after the cooking operation of the rice cooker is started, and according to the time detected from the timer 130. A PWM control unit 100d for outputting a motor control signal so that the rotational speed of the motor is variable, and a fan and a motor (not shown), the fan and the motor is driven in accordance with the motor control signal output from the PWM control unit 100d It includes a fan motor driver 160 to be.

When the cooking process starts, the PWM controller 100d according to the fourth embodiment outputs a motor control signal to the fan motor driver 160 to enable low speed rotation, and then detects the elapsed time from the timer 130.

The PWM controller 100d determines whether or not the time detected from the timer 130 exceeds a preset time, for example, a soaking process time, and maintains the output of the low speed rotation signal when the time is not exceeded. Judging by the process, and outputs the motor control signal to the maximum rotation speed.

In addition, the PWM controller 100d determines whether the time detected from the timer 130 exceeds the cooking process time, and if it does not exceed, maintains the output of the maximum rotation signal. Alternatively, the motor control signal is output so as to have a low rotation speed.

9 is a waveform diagram showing a comparison result of the noise test of the rice cooker according to the present invention. As shown in Figure 9, it can be seen that the generation of noise is significantly reduced compared to the prior art during the initial process and the cooking process, and it can be seen that the noise is reduced even during the further rotating cooking process.

In the above, the present invention has been illustrated and described with respect to certain preferred embodiments. However, the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains can vary as many as possible without departing from the spirit of the present invention as set forth in the claims below. Changes may be made.

1 is a block diagram showing a conventional electric rice cooker configuration.

2 is an exemplary view showing a cooking process of a general electric rice cooker.

Figure 3 is a waveform diagram showing the waveform of the current applied when driving the motor of the conventional rice cooker.

Figure 4 is a block diagram showing a first embodiment of the motor control apparatus of the rice cooker according to the present invention.

Figure 5 is a block diagram showing a second embodiment of the motor control apparatus of the rice cooker according to the present invention.

Figure 6 is a waveform diagram showing the waveform of the current applied when the motor drive of the rice cooker according to the present invention.

Figure 7 is a block diagram showing a third embodiment of the motor control apparatus of the rice cooker according to the present invention.

Figure 8 is a block diagram showing a fourth embodiment of the motor control apparatus of the rice cooker according to the present invention.

9 is a waveform diagram showing a comparison result of the noise test of the rice cooker according to the present invention.

(Explanation of symbols for the main parts of the drawing)

100a, 100b, 100c, 100d: PWM control

110: key input unit 120: temperature sensor

130: timer 140: heater

150: display unit 160: fan motor drive unit

Claims (8)

delete As a motor control device of an electric rice cooker, A temperature sensor detecting an inner pot temperature of the rice cooker; Based on the temperature detected from the temperature sensor, each cooking control signal is output so that the cooking process, the cooking process and the moxibustion process are performed. Outputs a motor control signal; outputs a motor control signal to maintain the high speed of the motor when the cooking control signal is a cooking signal; and rotates the motor when the cooking control signal is a signal of the moxibustion process. Outputting motor control signal to maintain low or medium speed Control unit; And And a fan and a motor, and a fan motor driving unit configured to drive the fan and the motor at any one of low speed, medium speed, and high speed according to a motor control signal output from the controller. As a motor control device of an electric rice cooker, A temperature sensor detecting an inner pot temperature of the rice cooker; A timer for detecting a time until the temperature of the inner pot reaches a preset temperature; The cooking control signal is outputted so that the cooking process, the cooking process, and the steaming process are performed based on the inner pot temperature detected by the temperature sensor and the arrival time detected by the timer, and the cooking control signal is a signal of the soaking process. When the motor control signal is output to maintain the rotational speed of the motor low speed, if the cooking control signal is a signal of the cooking process outputs the motor control signal to maintain the high speed of the motor, cooking control signal is A control unit for outputting a motor control signal so that the rotation speed of the motor maintains a low speed or a medium speed when the signal is in the moxibustion process; And And a fan and a motor, and a fan motor driving unit configured to drive the fan and the motor at any one of low speed, medium speed, and high speed according to a motor control signal output from the controller. As a motor control device of an electric rice cooker, A timer for detecting a time that elapses after the cooking operation including a soaking process, cooking process, and steaming process of the rice cooker is started; When the time detected from the timer is a soaking process time, the motor control signal is output so that the rotational speed of the motor is kept low. A control unit which outputs a control signal and outputs a motor control signal such that the rotation speed of the motor is maintained at a low speed or a medium speed when the time detected from the timer is a moxibustion process time; And And a fan and a motor, and a fan motor driving unit configured to drive the fan and the motor at any one of low speed, medium speed, and high speed according to a motor control signal output from the controller. The method according to any one of claims 2 to 4, The motor control signal is a motor control device for an electric rice cooker, characterized in that the PWM signal. delete As a motor control method of the rice cooker, When the cooking operation of the rice cooker including soaking, cooking, and steaming process is performed, the temperature set for each of the soaking, cooking and steaming process is detected, When the detected temperature is the temperature of the soaking process, the rotation speed of the motor is controlled to maintain a low speed, When the detected temperature is the temperature of the cooking process, to control the rotational speed of the motor to maintain a high speed, If the detected temperature is the temperature of the moxibustion process, the motor control method of the electric rice cooker, characterized in that to control the rotational speed of the motor to maintain a low or medium speed. As a motor control method of the rice cooker, When the cooking operation of the electric rice cooker including soaking, cooking, and moxibustion process is performed, the elapsed time for each soaking, cooking and moxibustion process is detected, If the detected time is the soaking process time, the rotational speed of the motor is controlled to maintain a low speed, When the detected time is the cooking process time, the rotation speed of the motor is controlled to maintain a high speed, The motor control method of the electric rice cooker, characterized in that for controlling the rotational speed of the motor to maintain a low or medium speed when the detected time is the moxibustion process time.

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