KR101641234B1 - Apparatus and method for controlling single-phase induction motor - Google Patents

Apparatus and method for controlling single-phase induction motor Download PDF

Info

Publication number
KR101641234B1
KR101641234B1 KR1020090111121A KR20090111121A KR101641234B1 KR 101641234 B1 KR101641234 B1 KR 101641234B1 KR 1020090111121 A KR1020090111121 A KR 1020090111121A KR 20090111121 A KR20090111121 A KR 20090111121A KR 101641234 B1 KR101641234 B1 KR 101641234B1
Authority
KR
South Korea
Prior art keywords
voltage
induction motor
switch
phase induction
auxiliary winding
Prior art date
Application number
KR1020090111121A
Other languages
Korean (ko)
Other versions
KR20110054476A (en
Inventor
김규남
김상영
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020090111121A priority Critical patent/KR101641234B1/en
Priority to PCT/KR2010/006440 priority patent/WO2011062361A2/en
Publication of KR20110054476A publication Critical patent/KR20110054476A/en
Application granted granted Critical
Publication of KR101641234B1 publication Critical patent/KR101641234B1/en

Links

Images

Classifications

    • 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
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/42—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor
    • H02P1/44—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor by phase-splitting with a capacitor
    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/04—Single phase motors, e.g. capacitor motors

Abstract

A single-phase induction motor control apparatus and method are disclosed. The present invention relates to an apparatus and method for controlling a single phase induction motor that is robust against variations in input voltage and protects the motor itself from overvoltage and can start or operate stably and efficiently even under a low voltage. A simple circuit including a switch is formed without using a device, and the phase of the current is controlled to improve the starting efficiency.

Single phase induction motor, zero crossing, phase control, start

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single phase induction motor control apparatus and a single phase induction motor control apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-phase induction motor, and more particularly, to a single-phase induction motor control apparatus and method capable of starting and operating stably and efficiently even under a low voltage.

Generally, an induction motor is composed of a stator with windings, and a rotor made of permanent magnets, aluminum conductors or iron cores. Such an induction motor is a device for generating a rotational power by generating a change in a periodic current in a winding mounted on the stator and generating a torque in the rotor by a constant change of the magnetic field according to a change in current.

A single-phase induction motor is a small-sized electric motor used for household appliances generally having an output of 400 W or less, and uses a commercial power source for household use, that is, a single-phase AC power source. These single-phase induction motors are mainly used in household appliances such as electric fans, air conditioners, refrigerators, and washing machines, and provide rotational power necessary for the fans, rotary blades, and compressors.

However, in the single-phase induction motor, when an AC power is applied to the single-phase winding, an induced current flows, but the electromagnetic forces generated in the conductors in the upper and lower portions of the rotor are canceled each other and an alternating magnetic field in which the magnitude changes in the direction of the axis of the winding So that it is impossible to generate a rotational force. Accordingly, a single-phase induction motor requires a starting device for starting the single-phase induction motor. The single-phase induction motor is classified into a split starter type, a shading coil type, a condenser starter type, and a repulsive starter type.

 1 is a circuit diagram schematically showing a general condenser operation type single-phase induction motor. 1, the single-phase induction motor includes a main winding 20, an auxiliary winding 30, a positive temperature coefficient of thermally-sensitive resistors 40 connected in series to the auxiliary winding 30, And a capacitor 50 connected in parallel to the Pitti thermistor 40. In addition, the single-phase induction motor may further include an over-load protector 70 for preventing overload. The Pitty thermistor (40) is a semiconductor device whose electrical resistance increases sharply when the temperature rises, and performs a switching function. That is, when the rotational speed reaches a predetermined value of the normal speed, the auxiliary winding is opened. The capacitor 50 improves the operation efficiency of the electric power factor of the electric motor.

When a single-phase AC power source 10 is applied to the motor, an alternating magnetic field is generated in the main winding line 20, and the capacitor 50 advances the phase of the current flowing to the auxiliary winding 30 by 90 degrees. As a result, auxiliary coils having an electrical phase difference of 90 degrees are generated in the auxiliary coils 30. Therefore, the alternating magnetic field generated in the main winding line 20 and the auxiliary magnetic field generated in the auxiliary winding 30 are not canceled out because the phases of the magnetic fields are different from each other.

The single-phase induction motor according to the prior art uses a starter such as a Pittsy thermistor and rotates when the starting torque is larger than the load torque, and the starting torque is proportional to the applied voltage. In the single-phase induction motor according to the related art, if the applied voltage is low or the load is large, the single-phase induction motor can not be started, and at the same time, a current of about 10 times the rated current is generated in the motor winding. That is, the single-phase induction motor according to the prior art has a problem that the motor is damaged due to a failure in starting at a low voltage and an abnormal operation is caused in an application device in which the motor is installed.

In addition, the Pitti thermistor has a problem that the time for opening the auxiliary winding can not be controlled, and the single-phase induction motor employing the Pitti thermistor has the problems of the start failure and the abnormal operation under the low voltage.

SUMMARY OF THE INVENTION The present invention provides a single-phase induction motor control apparatus and method that is robust against variations in input voltage, protects the motor itself from overvoltage, and can start or operate stably and efficiently even under a low voltage. There is a purpose in.

It is another object of the present invention to provide a single-phase induction motor control apparatus and method which improves the starting efficiency by constituting a simple circuit including a switch and controlling the phase of current without using a Pitti thermistor or an overload protection device.

According to an aspect of the present invention, there is provided a single-phase induction motor control apparatus comprising: a main winding line switch connected in series to a main winding line and for interrupting a power supply or an applied power to the main winding line; A detection unit for detecting an input voltage applied from an external power supply and detecting a zero cross point of the input voltage; and a detection unit for detecting a zero cross point of the input voltage, And a control unit that opens and closes the main winding line switch and the auxiliary winding switch based on the control signal. Here, the control unit connects the main line switch after a predetermined time elapses based on the zero cross point.

The single-phase induction motor control device according to the present invention further comprises a power source unit for converting the input voltage into a drive voltage of the control unit and outputting the drive voltage, wherein the power source unit includes a rectification unit for rectifying the input voltage, A smoothing unit for smoothing the rectified voltage; and a transforming unit for transforming the smoothed voltage to a driving voltage of the control unit.

In the single-phase induction motor control apparatus according to the present invention, the control unit opens the auxiliary winding switch when the detected voltage is equal to or higher than a preset reference voltage, and operates the motor through the main winding wire. The control unit opens the main power line switch and operates the motor through the auxiliary winding if the detected voltage is smaller than the reference voltage.

In the single-phase induction motor control device according to the present invention, when the first reference voltage and a second reference voltage greater than the first reference voltage are preset, and when the detection voltage is equal to or higher than the second reference voltage , The auxiliary winding switch is opened, and the electric motor is operated through the main winding wire. The control unit opens the main power line switch and operates the electric motor through the auxiliary winding when the detection voltage is equal to or lower than the first reference voltage.

According to another aspect of the present invention, there is provided a method of controlling a single phase induction motor, including: applying power to a single phase induction motor through a secondary winding switch; detecting a zero cross point of a voltage applied to the single phase induction motor; , Delaying the connection of the main winding line switch with respect to the zero cross point for a predetermined time, and starting the single phase induction motor. Here, the step of starting the single-phase induction motor may include the step of applying a current to the single-phase induction motor through the main winding line switch after the lapse of the predetermined time, Start the single-phase induction motor.

The single-phase induction motor control method according to the present invention includes the steps of: detecting a voltage applied to the single-phase induction motor; and opening and closing the primary winding switch or the secondary winding switch based on the detected voltage, Further comprising the steps of:

In the single-phase induction motor control method according to the present invention, the step of operating the single-phase induction motor includes the steps of: setting a reference voltage; comparing the detected voltage with the reference voltage; And opening the auxiliary winding switch when the reference voltage is equal to or greater than the reference voltage. The step of operating the single-phase induction motor further includes the step of opening the main power line switch when the detected voltage is smaller than the reference voltage as a result of the comparison.

In the single-phase induction motor control method according to the present invention, the step of operating the single-phase induction motor may include the steps of: setting a first reference voltage and a second reference voltage greater than the first reference voltage; Comparing the second reference voltage with the second reference voltage; and opening the auxiliary winding switch when the detected voltage is equal to or greater than the second reference voltage. The step of operating the single-phase induction motor may further include the step of comparing the detected voltage with the first reference voltage, and opening the main-line switch when the detected voltage is equal to or less than the first reference voltage do.

The single-phase induction motor control method according to the present invention further comprises the step of opening the main winding line switch and the auxiliary winding switch when the detection voltage is outside the predetermined operation range.

According to the apparatus and method for controlling a single-phase induction motor according to the present invention, a single-phase induction motor is robust against variation of an input voltage and can stably and efficiently start or operate under a low voltage. Further, the single-phase induction motor control apparatus according to the present invention can protect the motor itself from overvoltage.

The present invention improves the starting efficiency by constituting a simple circuit including the switch and controlling the phase of the current without using the Pitty thermistor or the overload protection device.

Hereinafter, a single phase induction motor control apparatus and a control method according to the present invention will be described in detail with reference to the accompanying drawings.

2, a single-phase induction motor control apparatus according to the present invention includes a main winding line 210 connected in series to a main winding line 210, and a main winding line switch 230 An auxiliary winding switch 240 connected in series to the auxiliary winding 220 to cut off the power applied or applied to the auxiliary winding 220, (500) for detecting a zero cross point of the input voltage, and a control unit (300) for opening / closing the main winding line switch and the auxiliary winding switch based on the zero cross point . Here, the control unit 300 connects the main line switch after a predetermined time elapses based on the zero cross point.

In addition, the control device may further include a driving capacitor 250 connected in parallel to the auxiliary winding switch 240 and compensating for a power factor. The control device can increase the operation efficiency of the single-phase induction motor through the operation capacitor 250. Of course, the driving capacitor 250 may be connected to the main line switch 230 in parallel, if necessary.

Relay, TRIAC, or other mechanical or electronic semiconductor devices may be used as the main winding line switch 230 and the auxiliary winding switch 240, respectively. In particular, the triac is a bidirectional thyristor that performs the same function as that of two silicon controlled rectifiers (SCRs) connected in parallel, is an electronic device, and is reliable because it can perform a large number of switching operations.

The detection unit 500 is constituted by a circuit including an OP-AMP or the like, and directly detects an AC voltage applied from the external power supply 100 and transmits the detected AC voltage to the control unit 300. The external power source 100 is a domestic commercial AC power source, for example, in the case of Korea, an AC power source of 220 V and 50 Hz is used. In addition, the detection unit 500 detects the zero crossing of the input voltage and transmits it to the control unit 300. Of course, the detection unit 500 can detect the input current, detect the zero crossing of the input current, and transmit it to the control unit 300.

The single-phase induction motor control device according to the present invention further comprises a power unit (400) for converting the input voltage into a driving voltage of the control unit and outputting the driving voltage, wherein the power unit (400) A smoothing unit for smoothing the rectified voltage, and a transforming unit for transforming the smoothed voltage to a driving voltage of the control unit.

The power supply unit 400 receives the external power supply 100, that is, commercial AC power, and outputs a DC voltage for driving a single-phase induction motor and a circuit, a unit, and the like included in the controller. Generally, the power unit 400 uses a switched-mode power supply (SMPS). Of course, other types of AC-DC converters other than SMPS can be used. The switch mode power supply rectifies and smoothes the AC voltage of the external power supply 100 and converts the DC voltage into a DC voltage. The DC voltage is converted to a single-phase induction motor and a single-phase induction motor control device using a transformer unit such as a high frequency transformer and a regulator And generates necessary driving voltages. The detection unit (500) detects an AC voltage of a commercial AC power source.

FIG. 3 is a graph for explaining the phase control in the single-phase induction motor control apparatus according to the present invention, and FIG. 4 is a graph for explaining a start-up change according to the phase control in FIG.

3 and 4, the single-phase induction motor control apparatus detects a zero-crossing point of the input voltage, and after a lapse of a predetermined time from the zero-crossing point, Current is applied. That is, the control unit 300 opens the main power line switch 230 for a predetermined period of time based on the zero crossing of the input voltage detected through the detection unit 500 and outputs the current applied to the main power line 210 Delay. Referring to FIG. 4, the starting capability of the single-phase induction motor is proportional to the product of the main winding line current, the auxiliary winding current, and the phase difference between the main winding line current and the auxiliary winding current. The phase current of the main winding line current is delayed, but the phase difference between the main winding line current and the auxiliary winding current is increased to improve the starting capability.

The control unit 300 opens both the main winding line switch 230 and the auxiliary winding switch 240 when the detection voltage is equal to or higher than a preset upper limit or lower than a preset lower limit. 5, the control unit 300 may set the upper limit VH in advance, and when the detected voltage is equal to or higher than the upper limit VH, the main power line switch 230 and the auxiliary winding switch 240) are opened to cut off the power input to the single-phase induction motor to prevent the breakage of the single-phase induction motor from the overvoltage. When the detection voltage is lower than the lower limit (VL), the control unit (300) opens both the main winding line switch (230) and the auxiliary winding switch (240) Phase induction motor to cut off the power to be supplied to the single-phase induction motor. Thus, an overcurrent is applied to the single-phase induction motor to prevent the abnormal operation. The control device may further include a separate storage unit (not shown), and the upper limit VH and the lower limit VL may be set and stored in the storage unit. The upper limit (VH) and the lower limit (VL) are set differently depending on the voltage condition of the region using the single-phase induction motor, the type and form of the single-phase induction motor, the load condition, .

Meanwhile, if the detected voltage is smaller than the upper limit and larger than the lower limit, the control unit 300 connects both the main winding line switch 230 and the auxiliary winding switch 240 to start the single-phase induction motor. Referring to FIG. 5, when the input voltage is within the operation range, the control unit 300 connects both the main winding line switch 230 and the auxiliary winding switch 240 to start the single-phase induction motor. The control unit 300 applies power to the main winding line 210 and the auxiliary winding 220 to generate an alternating magnetic field generated in the main winding line 210 and an auxiliary magnetic field generated in the auxiliary winding 220, So that a single-phase induction motor is rotated.

The control unit 300 opens the auxiliary winding switch 240 and operates the electric motor through the main winding line 210 when the detection voltage is equal to or higher than a predetermined reference voltage. On the other hand, if the detected voltage is smaller than a predetermined reference voltage, the control unit 300 can open the main winding line switch 230 and operate the motor through the auxiliary winding 220. The reference voltage is set differently according to the voltage of the region where the single-phase induction motor is used, the type and the form of the single-phase induction motor, the load condition, etc., and may be set to a predetermined ratio of the input voltage of the external power source.

5, the control unit 300 may set the first reference voltage V1 and the second reference voltage V2 in advance. If the detected voltage is equal to or higher than the second reference voltage V2, The auxiliary winding switch 240 is opened, and the electric motor is operated through the main winding line 210. The control unit 300 opens the main power line switch 230 and operates the motor through the auxiliary winding 220 when the detection voltage is lower than the first reference voltage V1. The first reference voltage V1 and the second reference voltage V2 are set differently depending on the voltage of the region using the single-phase induction motor, the type and the form of the single-phase induction motor, the load condition, As shown in FIG. The first reference voltage V1 and the second reference voltage V2 have a difference of about 10 V, for example, and perform a hysteresis operation to prevent the breakdown of the motor due to a sudden change in the input voltage.

Further, the control unit 300 can calculate the starting time based on the detected voltage, and after starting the single-phase induction motor, when the startup time according to the detection voltage elapses, one of the switches The single-phase induction motor can be operated.

In the single-phase induction motor control apparatus according to the present invention, the detection unit 500 may be connected to the smoothing unit of the power unit 400, and may detect the smoothed DC voltage through the smoothing unit. That is, the detection unit 500 detects the voltage output from the smoothing unit by a voltage distribution method using a resistor and transmits it to the control unit 300, and the control unit 300 detects the voltage The single-phase induction motor can be operated.

Referring to FIG. 6, a method of controlling a single-phase induction motor according to the present invention includes the steps of: (S110) applying power to a single-phase induction motor through an auxiliary winding switch S110; detecting a zero cross point of a voltage applied to the single- A step S120 for delaying the connection of the main winding line switch for a predetermined time based on the zero cross point S130 and a step S150 for starting the single phase induction motor. Here, the step (S150) of starting the single-phase induction motor includes a step (S140) of applying a current to the single-phase induction motor through the main-line switch after the predetermined time delay (S140) Phase induction motor via the auxiliary winding switch. The configuration of the apparatus is described below with reference to FIG.

3 and 4 together, the single-phase induction motor control method detects a zero-cross point of an input voltage and applies a current to the single-phase induction motor after a predetermined time elapses from the zero cross point. That is, the control method opens the main winding line switch 230 for a predetermined time based on the zero crossing of the detected input voltage to delay the current applied to the main winding line 210. Referring to FIG. 4, the starting capability of the single-phase induction motor is proportional to the product of the main winding line current, the auxiliary winding current, and the phase difference between the main winding line current and the auxiliary winding current. The phase current of the main winding line current is delayed, but the phase difference between the main winding line current and the auxiliary winding current is increased to improve the starting capability.

Referring to FIG. 7, the single-phase induction motor control method according to another example of the present invention includes a step S210 of detecting a voltage applied to the single-phase induction motor, (S240 to S242) of opening and closing the winding switch to operate the single-phase induction motor.

In the single-phase induction motor control method according to another example of the present invention, the step of operating the single-phase induction motor includes a process of setting a reference voltage (step S240) of comparing the detected voltage with the reference voltage And a step (S241) of opening the auxiliary winding switch when the detected voltage is equal to or greater than the reference voltage as a result of the comparison. Also, the step of operating the single-phase induction motor may further include a step (S242) of opening the main line switch when the detected voltage is smaller than the reference voltage as a result of the comparison.

Referring to FIG. 7, the single-phase induction motor control method according to another exemplary embodiment of the present invention detects a voltage input to the motor (S210), determines whether the detected voltage is equal to or greater than a predetermined upper limit (S220) It is determined whether the voltage is lower than a preset lower limit (S224). As a result of the determination, if the detected voltage is equal to or higher than the upper limit or is lower than the lower limit, that is, if the detected voltage is out of the operation range, the main power switch and the auxiliary winding switch are opened to supply power to the main power line and the auxiliary winding (S221, S222). If it is determined in step S220 and step S224 that the detection voltage is smaller than the upper limit and larger than the lower limit, that is, within the operation range, the motor is started by connecting the primary winding switch and the secondary winding switch ) The electric motor is operated by opening or closing the main winding line switch or the auxiliary winding switch based on the detection voltage (S240 or later). The configuration of the apparatus is described below with reference to FIG.

The single-phase induction motor control method detects a zero cross point of the input voltage (S232), and applies a current to the single-phase induction motor (S234) after a predetermined time elapses from the zero cross point (S233). That is, the control method opens the main winding line switch 230 for a predetermined time based on the zero crossing of the detected input voltage to delay the current applied to the main winding line 210 (S233). In the control method, when the detected voltage is equal to or higher than a predetermined reference voltage, the auxiliary winding switch is opened and the electric motor is operated through the main winding wire (S241). On the contrary, if the detected voltage is smaller than a predetermined reference voltage, the control method may open the main winding line switch and operate the motor through the auxiliary winding (S242). The reference voltage is set differently according to the voltage of the region where the single-phase induction motor is used, the type and the form of the single-phase induction motor, the load condition, etc., and may be set to a predetermined ratio of the input voltage of the external power source.

Referring to FIG. 8, the single-phase induction motor control method according to still another exemplary embodiment of the present invention includes a step S310 of detecting a voltage input to a motor, a step S320 of determining whether the detected voltage is equal to or more than a predetermined upper limit, (S324) of determining whether the detected voltage is equal to or lower than a predetermined lower limit; and if the detected voltage is out of the operating range, if the detected voltage is equal to or higher than the upper limit or lower than the lower limit, (S321, S322) of opening the main winding line switch and the auxiliary winding switch to cut off the power input to the main winding line and the auxiliary winding, and, as a result of the determining in the steps S320 and S324, if the detection voltage is lower than the upper limit (S335) connecting the main winding line switch and the auxiliary winding switch to start the motor when the detection voltage is within the operating range, It is configured to include the windings by opening and closing the switch or switches auxiliary winding phase (hereinafter S340) to drive the electric motor. The configuration of the apparatus is described below with reference to FIG.

The single-phase induction motor control method detects a zero cross point of an input voltage (S332), and applies a current to the single-phase induction motor (S334) after a predetermined time elapses from the zero cross point (S333). That is, the control method opens the main winding line switch 230 for a predetermined time based on the zero crossing of the detected input voltage to delay the current applied to the main winding line 210 (S333). Referring to FIG. 8, in the single-phase induction motor control method according to another example of the present invention, the step of operating the single-phase induction motor includes the steps of: comparing a first reference voltage and a second reference voltage (S340) of comparing the detected voltage with the second reference voltage (S340), and opening the auxiliary winding switch when the detected voltage is equal to or greater than the second reference voltage S342). In addition, the step of operating the single-phase induction motor may include comparing the detected voltage with the first reference voltage (S343), and if the detected voltage is equal to or less than the first reference voltage, (S344).

The operation of the motor may include setting a first reference voltage and a second reference voltage greater than the first reference voltage in advance and comparing the detected voltage with the second reference voltage in step S350, Is greater than or equal to the second reference voltage, the auxiliary winding switch is opened. When the auxiliary winding switch is opened, the single phase induction motor is operated through the main winding line (S360). The first reference voltage and the second reference voltage are set differently depending on the voltage condition of the region using the single-phase induction motor, the type and form of the single-phase induction motor, the load condition, etc., .

The control method repeatedly performs the operation of operating the motor by continuously detecting the input voltage.

5, the control method includes setting a first reference voltage V1 and a second reference voltage V2 in advance, and if the detected voltage is equal to or higher than the second reference voltage V2, The switch is opened, and the electric motor is operated through the main winding wire. In the control method, when the detected voltage is equal to or less than the first reference voltage (V1), the main power line switch is opened and the electric motor is operated through the auxiliary winding. The first reference voltage V1 and the second reference voltage V2 have a difference of about 10 V, for example, and perform a hysteresis operation to prevent the breakdown of the motor due to a sudden change in the input voltage.

As described above, the apparatus and method for controlling a single-phase induction motor according to the present invention include a switching device such as a triac in each of a main winding line and an auxiliary winding, detecting a zero crossing of an input voltage, , It is robust against fluctuation of input voltage by operating based on the input voltage, so that it can be started or operated stably and efficiently even in a low voltage region, and the motor itself can be protected from overvoltage.

1 is a circuit diagram schematically showing a general condenser operation type single-phase induction motor;

FIG. 2 is a block diagram schematically showing a configuration of a single-phase induction motor according to the present invention; FIG.

3 is a graph for explaining phase control in a single phase induction motor control apparatus and control method according to the present invention;

FIG. 4 is a graph for explaining the start-up change according to the phase control of FIG. 3;

5 is a graph showing a change of an operation mode according to a change of an input voltage in a single-phase induction motor according to the present invention;

6 to 8 are flowcharts schematically showing a control method of a single-phase induction motor according to embodiments of the present invention.

Claims (20)

A mains line switch connected in series to a mains line and for interrupting power supplied to or applied to the mains line; An auxiliary winding switch connected in series to the auxiliary winding and for applying power to the auxiliary winding or for interrupting the applied power; A detection unit for detecting an input voltage applied from an external power supply and detecting a zero cross point of the input voltage; A power supply unit for converting the input voltage into a driving voltage of the control unit and outputting the driving voltage; And And the control unit opens and closes the main winding line switch and the auxiliary winding switch based on the zero cross point. The apparatus according to claim 1, And the main winding line switch is connected after a predetermined time elapses based on the zero cross point. delete The power supply unit according to claim 1, A rectifying unit for rectifying the input voltage; A smoothing unit for smoothing the rectified voltage; And And a transforming unit for transforming the smoothed voltage into a driving voltage of the control unit. The control apparatus according to any one of claims 1, 2, and 4, Wherein when said detection voltage is equal to or higher than a preset reference voltage, said auxiliary winding switch is opened and said electric motor is operated through said main winding wire. 6. The apparatus according to claim 5, Wherein when the detected voltage is smaller than the reference voltage, the main power line switch is opened and the motor is operated through the auxiliary winding. The control apparatus according to any one of claims 1, 2, and 4, A first reference voltage and a second reference voltage greater than the first reference voltage are preset, Wherein when the detected voltage is equal to or higher than the second reference voltage, the auxiliary winding switch is opened and the motor is operated through the main winding line. 8. The apparatus according to claim 7, Wherein when the detected voltage is equal to or lower than the first reference voltage, the main power line switch is opened and the motor is operated through the auxiliary winding. Applying power to the single-phase induction motor through the auxiliary winding switch; Detecting a zero cross point of a voltage applied to the single-phase induction motor; Delaying a connection of the main line switch based on the zero cross point for a predetermined time; And And starting the single-phase induction motor, Detecting a voltage applied to the single-phase induction motor; And And operating the single-phase induction motor by opening and closing the primary winding switch or the secondary winding switch based on the detection voltage, The step of operating the single-phase induction motor includes: Comparing the detected voltage with a preset reference, and opening or closing the main winding line switch or the auxiliary winding switch according to a result of the comparison. 10. The method according to claim 9, wherein the step of starting the single- And applying a current to the single-phase induction motor through the main winding line switch after the predetermined time delay, And the single phase induction motor is started through the main winding line switch and the auxiliary winding switch. delete 11. The method of driving a single-phase induction motor according to any one of claims 9 to 10, A step of setting a reference voltage; Comparing the detected voltage with the reference voltage; And And opening the auxiliary winding switch when the detected voltage is equal to or greater than the reference voltage as a result of the comparison. The method as claimed in claim 12, wherein the step of operating the single- Further comprising the step of: if the detected voltage is smaller than the reference voltage, opening the main line switch. 11. The method of driving a single-phase induction motor according to any one of claims 9 to 10, Setting a first reference voltage and a second reference voltage that is greater than the first reference voltage; Comparing the detected voltage with the second reference voltage; And And opening the auxiliary winding switch when the detected voltage is equal to or greater than the second reference voltage. The method as claimed in claim 14, wherein the step of operating the single- Comparing the detected voltage with the first reference voltage; And And opening the main power line switch when the detected voltage is lower than the first reference voltage. 11. The method according to any one of claims 9 to 10, Comparing the detected voltage with a preset reference of an operation range range to determine whether the detected voltage is within a predetermined operation range; And And opening the main winding line switch and the auxiliary winding switch when the detected voltage is out of the preset operating range as a result of the determination. 1. An electric motor controller for controlling a single-phase induction motor, A mains line switch connected in series to a mains line and for interrupting power supplied to or applied to the mains line; An auxiliary winding switch connected in series to the auxiliary winding and for applying power to the auxiliary winding or for interrupting the applied power; A detection unit for detecting an input voltage applied from an external power supply and detecting a zero cross point of the input voltage; And And a control unit for opening and closing the main winding line switch and the auxiliary winding switch based on the zero cross point, Wherein the control unit comprises: And controls the operation of the single-phase induction motor by comparing the detection voltage with a preset reference and opening / closing the primary winding switch or the secondary winding switch according to the comparison result. 18. The apparatus of claim 17, And the main line switch is connected after a predetermined time elapses based on the zero cross point. 19. A method according to any one of claims 17 to 18, And a power unit for converting the input voltage into a driving voltage of the control unit and outputting the converted driving voltage. 20. The power supply unit according to claim 19, A rectifying unit for rectifying the input voltage; A smoothing unit for smoothing the rectified voltage; And And a transformer unit for transforming the smoothed voltage into a drive voltage of the control unit.
KR1020090111121A 2009-11-17 2009-11-17 Apparatus and method for controlling single-phase induction motor KR101641234B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020090111121A KR101641234B1 (en) 2009-11-17 2009-11-17 Apparatus and method for controlling single-phase induction motor
PCT/KR2010/006440 WO2011062361A2 (en) 2009-11-17 2010-09-17 Apparatus for controlling single-phase induction motor and method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090111121A KR101641234B1 (en) 2009-11-17 2009-11-17 Apparatus and method for controlling single-phase induction motor

Publications (2)

Publication Number Publication Date
KR20110054476A KR20110054476A (en) 2011-05-25
KR101641234B1 true KR101641234B1 (en) 2016-07-20

Family

ID=44060147

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020090111121A KR101641234B1 (en) 2009-11-17 2009-11-17 Apparatus and method for controlling single-phase induction motor

Country Status (2)

Country Link
KR (1) KR101641234B1 (en)
WO (1) WO2011062361A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102522928B (en) * 2011-11-25 2014-08-06 江苏白雪电器股份有限公司 Motor starter, starting method of motor and compressor
KR101251477B1 (en) * 2012-12-13 2013-04-05 김영준 Energy saving alternatives for electric motors including low-cost power factor correction
KR101576669B1 (en) * 2015-08-06 2015-12-11 (주)그랜드 The output voltage control system of single-phase induction generator using the self excitation capacitance controller
WO2018160950A1 (en) 2017-03-02 2018-09-07 Environment One Corporation Motor starting circuits, motor control assemblies, and grinder pump assemblies employing same
KR102049072B1 (en) * 2018-02-22 2019-11-26 경남대학교 산학협력단 Line-start Single Phase Pole Change Induction Motor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5380019U (en) * 1977-10-19 1978-07-04
JP3062638B2 (en) * 1992-02-12 2000-07-12 芝浦メカトロニクス株式会社 Single phase induction motor
JPH11146691A (en) * 1997-11-12 1999-05-28 Hitachi Ltd Control of operation of household electric equipment
BR0305905A (en) * 2003-12-11 2005-08-16 Brasil Compressores Sa Single Phase Induction Motor Starting System
KR20070025067A (en) * 2005-08-31 2007-03-08 엘지전자 주식회사 Control circuit for the blushless dc motor

Also Published As

Publication number Publication date
WO2011062361A2 (en) 2011-05-26
WO2011062361A3 (en) 2011-08-04
KR20110054476A (en) 2011-05-25

Similar Documents

Publication Publication Date Title
KR101641234B1 (en) Apparatus and method for controlling single-phase induction motor
EP2476174A1 (en) Systems and methods for polyphase alternating current transformer inrush current limiting
WO2019026282A1 (en) Electric motor drive device and air conditioner
US20160197566A1 (en) Method and apparatus to control a single-phase induction motor
WO2017174957A2 (en) Method and apparatus for controlling three-phase electric motor
KR101537708B1 (en) Apparatus and method for controlling single-phase induction motor
KR101549864B1 (en) Apparatus and method for controlling single-phase induction motor
KR101637445B1 (en) Apparatus and method for controlling single-phase induction motor
KR101939474B1 (en) Motor drive apparatus
CN108075687B (en) Apparatus, system and method for starting single phase induction motor
JP2010259211A (en) Automatic voltage regulator of ac generator
US10833615B2 (en) Methods for controlling a voltage present at an electric fan
US9979341B2 (en) Methods and systems for programming an electric motor
JP6016712B2 (en) AC brushless exciter and power generation system
US8680725B2 (en) Electric motor
US20140346867A1 (en) Home appliance comprising an electric motor having at least two coils, method and system for controlling the home appliance, use of electric motor for feeding in the home appliance
JP2006034000A (en) Rush current prevention circuit for air conditioner
KR20140034228A (en) Method and system for controlling input voltage in electric charges
KR102157586B1 (en) Motor drive control apparatus having direct-starting function
KR102523153B1 (en) Motor drive apparatus performing algorithm for preventing abnormal operation
WO2015033427A1 (en) Air conditioning device
KR101965180B1 (en) Air conditioner
JP2004364385A (en) Multi-pulse rectifier/transformer
Farade Safe starting, protection and speed control of induction motor
KR101070436B1 (en) Power line tap selected variable speed electronically commutated motor

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right