KR101866557B1 - Convection fan control system and method of a steam oven - Google Patents

Convection fan control system and method of a steam oven Download PDF

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Publication number
KR101866557B1
KR101866557B1 KR1020160182403A KR20160182403A KR101866557B1 KR 101866557 B1 KR101866557 B1 KR 101866557B1 KR 1020160182403 A KR1020160182403 A KR 1020160182403A KR 20160182403 A KR20160182403 A KR 20160182403A KR 101866557 B1 KR101866557 B1 KR 101866557B1
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KR
South Korea
Prior art keywords
motor
rpm
convection fan
steam oven
cooking
Prior art date
Application number
KR1020160182403A
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Korean (ko)
Inventor
주민식
박문영
Original Assignee
린나이코리아 주식회사
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Priority to KR1020160182403A priority Critical patent/KR101866557B1/en
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Publication of KR101866557B1 publication Critical patent/KR101866557B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/003—Details moisturising of air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges
    • F24C3/128—Arrangement or mounting of control or safety devices on ranges in baking ovens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
    • F24C7/085—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination on baking ovens
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/24—Controlling the direction, e.g. clockwise or counterclockwise
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/14—Electronic commutators
    • H02P6/16—Circuit arrangements for detecting position
    • H02P6/17—Circuit arrangements for detecting position and for generating speed information

Abstract

A convection fan control system is disclosed. The convection fan control system includes a convection fan of a steam oven including a fan assembled with a motor. The motor includes a Hall sensor for detecting the number of rotations of a rotor. The convection fan control system includes a control part which controls the motor to rotate forwards/backwards at a predetermined time during the cooking time of the steam oven, detects the RPM of the motor through a Hall sensor when switching the forward/backward rotation of the motor, compares the detected RPM with an RPM reference value, and then controls the rotation of the motor so as to increase a stop time until it falls to the RPM reference value or less. Durability can be improved. The product reliability of the steam oven can be improved.

Description

[0001] The present invention relates to a convection fan control system and method for a steam oven,

The present invention relates to a convective fan control system and method for a steam oven that reflects changes in the number of revolutions of a steam oven convection fan motor to forward / reverse rotation control of a convection fan.

Gas or electric steam ovens, including steam convection ovens, can be used to cook food according to the user's preference, such as baking or steaming at high temperature, in a sealed cooking chamber, or to defrost frozen food. Is used for cooking. The steam oven includes a steam generator for heating water to generate and supply steam, and a water supply device for supplying water to the steam generator. The steam generator includes a heater for heating water to be supplied and a convection fan for circulating steam in the cooking chamber and an AC motor.

The forward / reverse rotation control of the existing A / C motor changes the forward / reverse rotation when the dwell time elapses after the motor stop command is given. This causes the rotational speed (RPM , It is difficult to control it in consideration of this, and the change of the motor rotation speed can be controlled by a separate control unit. For example, the AC motor forward / reverse control operates as a system that changes the forward / reverse rotation when the motor rotation time set based on the data through the experimental data after the motor stop operation instruction is elapsed. AC motors can be rotated by inertia because they do not apply brakes even if a stop instruction is given, unlike BLDC control method. If the motor rotates in reverse at this time, the motor can be burdened. Although the motor is controlled to rotate in the reverse direction after a lapse of time, factors that may affect the rotation speed, such as the ambient temperature and the motor temperature, can not be reflected in the control of the motor.

Patent Document 1: Korean Patent Laid-Open Publication No. 10-2016-0093967 (published on August 09, 2016) Patent Document 2: Korean Published Patent Application No. 10-2014-0100637 (Publication date Aug. 18, 2014) Patent Document 3: Korean Patent Laid-Open Publication No. 10-2012-0074409 (public date July 06, 2012)

One of the technical problems of the present invention is to always ensure the product reliability of the steam oven. The change in the number of revolutions of the convection fan motor of the steam oven is reflected in the forward / reverse rotation control to improve durability.

According to the present invention, there is provided a convection fan of a steam oven including a fan incorporated in a motor, wherein the motor includes a hall sensor for detecting the number of rotations of the rotor,

The motor is rotated forward / backward for a preset time during the cooking time of the steam oven. When the motor is rotated in the forward / reverse direction, the RPM of the motor is detected through the Hall sensor. The detected RPM is compared with the RPM reference value, And a control unit for controlling the rotation of the motor so as to increase the dwell time until it falls below the reference value.

According to an embodiment of the present invention, the motor may include an AC motor using a commercial power source.

According to an embodiment of the present invention, the control unit includes: an RPM measurement unit for measuring an RPM detected by the Hall sensor during the forward / reverse rotation of the motor; And an RPM reference value comparing unit for comparing the RPM measured by the RPM measuring unit with a predetermined RPM reference value.

According to the embodiment of the present invention, the control unit may include an MCU that is controlled such that the downtime of the motor is reset to an initial value upon cooking completion.

According to an embodiment of the present invention, the controller may include an MCU in which the extended downtime of the motor is applied or repeatedly applied to the next motor drive cycle according to the cooking temperature.

According to the present invention, the above-mentioned objects can be accomplished by a refrigerator comprising: a first step in which a steam oven is turned on and a cooking button is pressed to operate a convection fan; A second step of maintaining the state of the convection fan for a predetermined motor rotation time when the motor of the convection fan is accelerated in a forward direction and reaches a constant RPM; A third step of controlling the motor so that the set motor rotation time elapses and a stop instruction is issued to the motor before the motor rotates in the reverse direction to have an initial rest time; And a fourth step of rotating the motor in a reverse direction when the RPM of the motor is measured through the Hall sensor after the lapse of the dwell time and the measured RPM falls below the RPM reference value set in the control unit Can be achieved.

According to an embodiment of the present invention, in the second step, the downtime of the motor may be maintained at the time of cooking and may be reset to an initial value upon completion of cooking.

Stable convection of steam in the steam oven and extended convective fan life increases the reliability of the steam oven. By reducing the forward / reverse rotation load of the convection fan motor, the motor is prevented from burnout and the durability is improved. Also, the components for controlling the convection fan motor can be simplified.

Figure 1 is a schematic illustration of a steam convection oven.
2 is an illustration of a convection fan according to an embodiment of the present invention.
3 is an illustration of a steam oven convection fan control according to an embodiment of the present invention.
4 is a flowchart of a steam oven convection fan control according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view of a steam convection oven to which a direct injection system is applied.

1, the steam convection oven S is provided with a convection fan 200 for convection of steam in the cooking chamber A where the door D is installed and the heat in the cooking chamber.

The direct water to be fed W1 is supplied to the heater C along the water supply flow path B and heated to generate steam and the steam is caused to flow to the cooking chamber A by the convection fan 200. [

Normally, when the cooking button operating section 310 is provided on the door A so as to press or operate the cooking button operating section 310, the cooking is cooked according to the selected course.

In the steam oven, the convection fan motor has an AC motor. The convection fan is exposed to the high temperature atmosphere of the cooking chamber of the steam oven and is affected by the high temperature of the steam, so that the temperature of the motor easily rises and the rotation speed may change in the forward / reverse rotation.

In addition, a change in the number of revolutions may occur due to a temperature change in the cooking chamber and a change in air density due to a change in humidity

A change in the number of revolutions of the convection fan motor in the steam oven can cause the steam to not flow properly into the cooking chamber. This may deteriorate the quality of the cooking, deteriorate the performance of the convection fan, and decrease the durability of the motor. The forward / reverse rotation control of the convection fan motor is controlled so that the rotation direction (forward / reverse) is systematically changed when the motor rotation time set based on the data through the experimental value after the motor stop operation instruction is elapsed.

In this case, the experimental value may be a predetermined time for efficient heat distribution in the furnace, and may be a predetermined time for reducing the load on the motor and related parts.

The present invention increases the durability of the motor by simply measuring the RPM of the motor through the hall sensor (hal1 sensor) and increasing the downtime depending on the situation to reflect the change in the rotational speed of the convection fan motor due to other factors such as temperature rise. To the public.

In the convection fan control of the steam oven according to the present invention, the RPM of the motor is detected through the Hall sensor, and the RPM value of the motor detected by the Hall sensor is used as the RPM of the motor that can be generated due to other factors such as the cooking chamber, And is reflected to the rotation control so as to reduce the driving load of the motor when the rotation direction of the motor changes from the forward direction to the reverse direction.

In the convection fan control of the steam oven according to the present invention, the RPM of the motor is detected through the Hall sensor, and the rotational direction of the motor is switched from the forward direction to the reverse direction within the optimum time by using the detected RPM value .

2 is a view illustrating a convection fan of a steam oven to which a Hall sensor according to an embodiment of the present invention is applied.

The convection fan 200 may be configured such that the fan 220 is assembled to the shaft 212 of the motor 210 so that the fan is rotated according to the rotation of the motor. The Hall sensor 214 for detecting the number of rotations of the rotor 211 is installed on the disk substrate 213 on which at least one hole a1 is formed. The Hall sensor 214 attached to the substrate 213 detects the number of rotations of the rotor 211 and sends the counted value to the control unit 300 so that the control unit 300 can calculate the count value.

The hall sensor 214 for detecting the position of the rotor 211 and detecting the RPM is applied to, for example, a BLDC motor. The Hall sensor module applied to most BLDC motors has several Hall sensors. If one or two Hall sensors fail, the efficiency of the Hall sensor module deteriorates. The convection fan 200 according to the present invention rotates repeatedly in the positive (R1) / reverse (R2) direction according to the cooking mode, so that it is preferable to install at least three hall sensors.

3 is an illustration of a convection fan control system of a steam oven according to an embodiment of the present invention.

3, when the cooking start button is pressed on the cooking button control unit 310, the control unit 300 drives the motor 210 of the convection fan 200 to flow the steam air into the cooking chamber. The motor 210 of the convection fan 200 detects the number of revolutions of the rotor 211 by the hall sensor 214. The number of revolutions of the motor detected by the hall sensor can be input to the MCU 301 to be stored, operated, or compared. The RPM measuring unit 302 measures the number of revolutions of the motor detected from the hall sensor 214. The RPM reference value set by the RPM reference value comparing unit 303 can be compared with the measured RPM of the motor, The forward / reverse rotation of the motor can be controlled.

The convection fan control system of the steam oven according to the embodiment of the present invention includes a fan 220 installed in the motor 210 and a convection fan 200 in the steam oven, And a hall sensor 213 for detecting the number of holes.

Then, the motor 210 is rotated in the forward / reverse direction for a predetermined time in accordance with the cooking of the steam oven. When the forward / reverse rotation of the motor is converted, the RPM of the motor is detected through the hall sensor, and the detected RPM is compared with the RPM reference value And a control unit 300 for controlling the rotation of the motor so as to increase the dwell time until it falls below the RPM reference value.

At this time, the dwell time may be set to be longer than a predetermined reference time to prevent frequent forward / reverse rotation of the motor.

In the control unit 300, the motor power can be controlled by the MCU 301. The MCU 301 includes an RPM measuring unit 302 for measuring the RPM detected by the hall sensor 213 in the forward / reverse rotation of the motor, an RPM measuring unit 302 for measuring the RPM measured by the RPM measuring unit 302, And an RPM reference value comparison unit 303 for performing a comparison operation with the set RPM reference value.

The control unit 300 may include an MCU 301 that is controlled such that the downtime of the motor is reset to an initial value upon cooking completion.

The control unit 300 determines whether the motor is in the idle state or not, and when the set cooking time has elapsed, the idle time of the motor is reset to the initial idle time, Controlled MCU < RTI ID = 0.0 > 301 < / RTI >

The RPM detected by the hall sensor may include an MCU 301 controlled to be varied in accordance with a cooking temperature change in the cooking chamber and to be varied within a predetermined range in comparison with a constant cooking temperature and a previous resting time in the cooking mode. Therefore, when temporary breakdown of the hall sensor occurs during cooking, the stability of the motor can be ensured by comparing the previous resting time and varying within a certain range.

The method of controlling a convection fan of a steam oven according to an embodiment of the present invention includes a first step in which a steam oven is turned on and a cooking button is pressed so that a convection fan is operated. When the motor of the convection fan accelerates in a forward direction and reaches a predetermined RPM A third step of maintaining the state for the motor rotation time set by the experimental value, a third step of controlling the motor to have an initial rest time by issuing a stop instruction to the motor before the motor rotation time has elapsed and the motor is rotated in the reverse direction, When the RPM of the motor is measured through the post hall sensor and the measured RPM falls below the RPM reference value set in the control unit, the motor may be controlled to the fourth step of rotating in the reverse direction.

In the second step, the downtime of the motor is maintained at the time of cooking, and it can be controlled to a step of resetting to the initial value upon completion of cooking.

4 is a flowchart of a steam oven convection fan control according to an embodiment of the present invention.

In Fig. 4, T1 represents the cooking time and T2 represents the rotation time (forward / reverse) of the motor.

When the cooking button operating portion 310 of the steam oven is pressed, the MCU 301 instructs the driving of the convection fan motor 210 so that the motor 210 rotates and the cooking process proceeds (S110). The control unit 300 continuously checks the cooking time T1 (S111).

If it is determined in step S111 that the cooking time T1 has elapsed, the pause time is reset (S112) and the cooking is completed (S113).

If it is determined in step S111 that the cooking time T1 has not elapsed, the rotation time T2 of the motor is determined (S114).

As a result of the determination in step S114, if the motor rotation time T2 elapses, the motor rotation is stopped (S115), the motor is stopped from the stopping time (S116) If not, the process returns to step S110.

The RPM of the motor is measured by the Hall sensor while passing through steps S111 to S115 (S117). The RPM measurement value of the motor measured in step S117 is compared with the RPM reference value set in the controller (S118).

If it is determined in step S118 that the measured RPM of the motor is larger than the reference RPM (measured RPM> reference RPM), the controller waits for more idle time.

If it is determined in step S118 that the measured RPM of the motor is smaller than the reference RPM (measured RPM <reference RPM), the direction change of the motor is instructed and terminated or the rotation of the convection fan motor (S119).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, .

A: Cooking room B: Water supply channel
C: Heater D: Door
S: Steam convection oven
200: convection fan 210: motor
211: Rotor 212: Axis
214: hall sensor 220: fan
300: control unit 301: MCU

Claims (7)

A convection fan of a steam oven including a fan incorporated in a motor, the motor including a hall sensor for detecting the number of rotations of the rotor,
The motor is rotated forward / backward for a preset time during the cooking time of the steam oven. When the motor is rotated in the forward / reverse direction, the RPM of the motor is detected through the Hall sensor. The detected RPM is compared with the RPM reference value, And controlling the rotation of the motor so as to further increase the dwell time until the temperature falls below the reference value and controlling the extended dwell time of the motor to be applied or repeatedly applied to the next motor drive cycle according to the cooking temperature The convection fan control system of the steam oven. The method according to claim 1,
The motor is an AC motor, the convection fan control system of a steam oven. The method according to claim 1,
Wherein,
An RPM measuring unit for measuring the RPM detected by the Hall sensor during the forward / reverse rotation of the motor; And an RPM reference value comparing unit for comparing the RPM measured by the RPM measuring unit with a predetermined RPM reference value. The method according to claim 1,
Wherein,
Wherein the MCU is controlled such that the downtime of the motor is reset to an initial value upon completion of cooking. delete delete delete
KR1020160182403A 2016-12-29 2016-12-29 Convection fan control system and method of a steam oven KR101866557B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102413237B1 (en) 2020-12-28 2022-06-27 린나이코리아 주식회사 Convection fan temperature compensation control system and method of steam oven

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003023790A (en) * 2001-07-06 2003-01-24 Japan Servo Co Ltd Blower fan motor having automatic restoring function
KR20120074409A (en) 2010-12-28 2012-07-06 (주)모토닉 Appartus for motor drive control
KR20140100637A (en) 2013-02-06 2014-08-18 한라비스테온공조 주식회사 Hall sensor module and motor control method using the same
KR20160093967A (en) 2015-01-30 2016-08-09 린나이코리아 주식회사 Apparatus and method for controlling brushles mortor and fan for steam oven
JP2016166601A (en) * 2015-02-13 2016-09-15 台達電子工業股▲ふん▼有限公司Ｄｅｌｔａ Ｅｌｅｃｔｒｏｎｉｃｓ，Ｉｎｃ． System and method for controlling forward/reverse rotation of fan

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003023790A (en) * 2001-07-06 2003-01-24 Japan Servo Co Ltd Blower fan motor having automatic restoring function
KR20120074409A (en) 2010-12-28 2012-07-06 (주)모토닉 Appartus for motor drive control
KR20140100637A (en) 2013-02-06 2014-08-18 한라비스테온공조 주식회사 Hall sensor module and motor control method using the same
KR20160093967A (en) 2015-01-30 2016-08-09 린나이코리아 주식회사 Apparatus and method for controlling brushles mortor and fan for steam oven
JP2016166601A (en) * 2015-02-13 2016-09-15 台達電子工業股▲ふん▼有限公司Ｄｅｌｔａ Ｅｌｅｃｔｒｏｎｉｃｓ，Ｉｎｃ． System and method for controlling forward/reverse rotation of fan

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102413237B1 (en) 2020-12-28 2022-06-27 린나이코리아 주식회사 Convection fan temperature compensation control system and method of steam oven

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