KR101301491B1 - control apparatus of motor, washing machine using the same of and control method of thereof - Google Patents

Abstract

The present invention relates to a control apparatus of a motor and a control method of a washing machine including the same, an object of the present invention is to accurately detect the current value applied to the motor, based on the control device of the motor and the washing machine using the same And to provide a control method thereof.

To this end, a control apparatus for a motor according to the present invention includes a motor; a motor driving unit for applying an AC power to the motor; A load current detector for outputting a signal corresponding to the magnitude of the load current applied to the motor; And a controller configured to amplify the signal output from the current sensing unit at a predetermined amplification rate, and to control the motor driver based on a result of matching the amplified signal to a preset control data table.

Motor, motor controller, washing machine

Description

Control apparatus of a motor, a washing machine using the same, and a control method of the washing machine using the same

      1 is a schematic diagram showing a control system of a washing machine using a control apparatus of a motor according to the present invention.

      2a and 2b is a flow chart showing the control procedure of the washing machine using the control device of the motor according to the present invention.

Description of the Related Art [0002]

50: load current detection unit 70: control unit

75: motor drive unit 80: memory unit

95: rotating tub

The present invention relates to a control apparatus of a motor, a washing machine using the same, and a control method of the washing machine using the same, and more particularly, to accurately detect a current value applied to the motor, and to control the motor based on the same. It relates to a washing machine using and a control method of the washing machine using the same.

In general, a motor is a device that converts electrical energy into mechanical movement energy. Motors are classified into DC motors and AC motors according to the type of electrical energy applied to the motor. DC motors are classified into brush motors and brushless motors according to the presence or absence of a brush for forming a rotating magnetic field.

The brushless motor forms and drives a rotating magnetic field through a drive unit having a rectifier, which is an important component of a DC motor, and an inverter instead of a brush. Such brushless motors are being used as washing motors for washing machines because of their high efficiency and easy rotation speed control, and their application fields are increasing.

The control device of the motor for controlling the brushless motor performs the rotor position control using a hall sensor.

On the other hand, in recent years, a device for manufacturing a motor having a current sensor used for detecting the position of the rotor and controlling the rotational speed by using a sensed current value and sensing the current applied to the motor has been proposed.

However, the conventional control device for a motor having a current sensor drives the motor without accurately detecting a current value applied to the motor. Accordingly, the conventional motor control apparatus does not accurately determine the position of the rotor of the motor, there is a problem that does not effectively prevent the vibration generated when the motor is rotated. In addition, the conventional motor controller has a problem in that it does not minimize the power lost in the motor by controlling the driving unit of the motor without accurately detecting the rotor position of the motor. Furthermore, there is a problem of weakening the torque of the motor.

In addition, when the conventional motor control apparatus is applied to the washing motor of the washing machine, there is a problem in that the rotating tub is vibrated and the washing machine swings. And there is a problem that the washing tub for the laundry is lowered because the rotating tub is not provided with sufficient rotational force.

Accordingly, the present invention has been made to solve the above-described problems, an object of the present invention is to accurately detect the current value applied to the motor and control the motor based on the control device of the motor, a washing machine using the same and a control method thereof To provide that purpose.

Other objects and advantages of the present invention will be described hereinafter and will be understood by the embodiments of the present invention. Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the claims.

       Control device for a motor according to the present invention for achieving the above object is a motor; a motor driving unit for applying AC power to the motor; A load current detector for outputting a signal corresponding to the magnitude of the load current applied to the motor; And a controller configured to amplify the signal output from the current sensing unit at a predetermined amplification rate, and to control the motor driver based on a result of matching the amplified signal to a preset control data table.

Here, the signal output from the load current sensing unit is characterized in that it has a voltage proportional to the magnitude of the load current applied to the motor.

The controller may amplify the signal output from the current sensing unit at an amplification rate inversely proportional to the voltage level of the signal.

The position control data of the motor is included in the set control data table.

In addition, the washing machine using the control device of the motor according to the present invention for achieving the above object is a motor for rotating the rotating tub; A motor driving unit for applying AC power to the motor; A load current detector for outputting a signal corresponding to the magnitude of the load current applied to the motor; And a controller configured to amplify the signal output from the current sensing unit at a predetermined amplification rate, and to control the motor driver based on a result of matching the amplified signal to a preset control data table.

 Here, the signal output from the load current detecting unit has a voltage proportional to the magnitude of the load current applied to the motor.

 The controller may amplify the signal output from the current sensing unit at an amplification rate inversely proportional to the voltage level of the signal.

 The set control data table may include position control data of the motor.

 In another aspect, a control method of a washing machine using a control apparatus of a motor according to the present invention for achieving the above object is a signal for detecting the load current of the motor rotating the rotating tub and outputs a signal corresponding to the magnitude of the load current Output stage; A signal amplifying step of amplifying the output signal at a predetermined amplification rate; And a motor driver controlling step of controlling the motor driver according to the matching result by matching the amplified signal with a preset control data table.

Here, the signal output step is characterized in that the output signal has a voltage proportional to the magnitude of the load current applied to the motor.

The signal amplifying step may include amplifying the output signal at an amplification factor inversely proportional to the voltage magnitude of the output signal.

The controlling of the motor driving unit may match the position control data table of the motor included in the preset control data table.

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

1 is a block diagram showing a control system of a washing machine using a control device of a motor according to the present invention.

Referring to Figure 1, the control system of the washing machine using the control device of the motor according to the present invention is connected to the rectifier 10 and the output terminal of the rectifier 10 for rectifying the AC power supplied from a commercial AC power (5) The DC link stage 20 for removing the pulses and the inverter 30 connected to the output side of the DC link stage 20 to convert DC power into AC power, and rotating using the AC power output from the inverter 30. The motor 90 generates the rotational force through the rotor rotating the magnetic field by the stator, the rotating tank 95 rotated by the rotational force of the motor, and the load current sensing the load current of the power applied to the motor 90. The sensing unit 50 and a control unit 70 for controlling the motor driving unit 30 by using the load current value detected by the load current detecting unit 50.

In detail, the AC power source 5 is a commercial AC power source whose frequency may be 50 Hz or 60 Hz.

In the rectifier 10, the rectifier diode 11 is bridged to form a single-phase full-wave rectifier circuit, and receives AC power from the AC power source 5 to output DC power.

The DC link stage 20 connected to the output side of the rectifying unit 10 removes the ripple or ripple component included in the DC power output from the rectifying unit 10. The DC link stage 20 is implemented with a capacitor 21.

On the other hand, it is noted here that a low pass filter can be used as a means for removing the ripple or ripple component.

The motor driver 75 includes an inverter 30 and a pulse width modulator 80.

In detail, the inverter 30 has six transistors 31 serving as switching elements connected to the output side of the DC link stage 20 by three-phase full bridge connection. The pulse width modulator 80 is controlled by the controller 70 to be described later, and supplies a pulse signal having a predetermined duty ratio to the gates of the six transistors 31. Accordingly, the six power transistors 31 are controlled on / off by the pulse width modulator 80 to convert the DC power output from the DC link stage 20 of the inverter 30 to convert the DC power into three-phase AC power. To the stator windings of the motor (90).

The load current detecting unit 50 is connected to both ends of the base resistor 51 and the base resistor 51 connecting the motor 90 and the inverter 30 to sense a load current flowing through the base resistor 51. It consists of a current sensing circuit 52. The load current detection unit 50 generates an analog signal having a voltage proportional to the magnitude of the load current of the motor 90 and supplies it to the A / D port 60 to be described later.

Here, the magnitude of the voltage across the basic resistor 51 is found to be proportional to the magnitude of the current by Ohm's law. That is, the load current can be sensed by sensing the voltage across the basic resistor 51.

In addition, the load current sensing circuit 52 reveals that an operational amplifier can be used. That is, one end of the basic resistor 51 is connected to the reference voltage input terminal of the operational amplifier, and the other end of the basic resistor 51 is connected to the comparison voltage input terminal of the operational amplifier, so that an analog having a voltage amplified at the output terminal of the operational amplifier is provided. It can be configured to output a signal.

The magnitude of the analog signal output from the load current detection unit 50 changes in response to the load applied to the motor 90. Furthermore, it turns out that it can change corresponding to the load on the rotating tank 95. FIG.

The A / D port 60 converts an analog signal input from the load current sensing unit 50 into a digital signal and supplies the converted digital signal to the control unit 70. Here, it is apparent that the digital signal output from the A / D port 60 is quantized to reflect the magnitude of the analog signal voltage input to the A / D port 60.

The controller 70 amplifies the signal according to the voltage of the signal input from the A / D port 60. That is, if the voltage magnitude of the signal is greater than or equal to the first reference voltage, the signal is amplified at a first amplification rate. If the signal is greater than or equal to the second reference voltage and less than the first reference voltage, the signal is amplified at a second amplification rate. If the voltage is equal to or greater than 3 and less than the second reference voltage, the signal is amplified at a third amplification factor corresponding thereto.

Here, it is noted that the voltage magnitude of the signal and the magnitude of the amplification factor are inversely proportional. For the convenience of explanation, the magnitude of the amplification ratio presented in the embodiment of the present invention is revealed to be the relationship between the third amplification ratio> second amplification ratio> first amplification ratio. Accordingly, considering the load current consumed in each washing stroke of the washing machine, the first amplification rate is an amplification rate when the washing machine performs siege detection, the second amplification rate is an amplification rate when the washing stroke is performed, and the third amplification rate is It can be deduced that the amplification factor when dehydrating is performed. In the present invention, three amplification ratios are provided, but the present invention is not limited thereto.

On the other hand, the memory unit 85 stores respective control data tables corresponding to the magnitudes of the signals amplified by the respective amplification rates. That is, a first control data table corresponding to the first amplification factor, a second control data table corresponding to the second amplification factor, and a third control data table corresponding to the third amplification factor are stored. This control data table is set by experiment so that the motor driving unit 75 can be controlled to suit the load current consumed in a state where a predetermined load is applied to the motor 90. Here, it is noted that the control data table may include motor position control data and the like for rotor position control of the motor 90.

In other words, the motor driver 75 may be controlled in response to the subdivided load current by amplifying a small load current, that is, a signal in the magnitude region of the load current requiring the control of the motor driver 75 corresponding to the minute load current change. It becomes possible.

The controller 70 controls the motor driver 75 by reading control data corresponding to the magnitude of the amplified signal from the control data table corresponding to each amplification factor stored in the memory 85. Accordingly, the motor drive unit 75 is accurately controlled.

On the other hand, the control unit 70 and the memory unit 85 has been shown to be formed separately, but not limited to this, it will be appreciated that it can be formed integrally.

Hereinafter, a control method of a washing machine using a control apparatus of a motor according to the present invention will be described with reference to the drawings.

2a and 2b is a flow chart showing the control procedure of the washing machine using the control device of the motor according to the present invention.

First, when the power is turned on (ON) by the user in the control system of the washing machine according to the present invention, the load current detection unit 50 starts to detect the load current (S201, S202).

In this way, the load current detecting unit 50 detects the load current and provides an analog signal to the A / D port 60 and the port 60 connected to the control unit 70. At this time, the A / D port 60 quantizes the analog signal and supplies it to the controller 70.

In addition, the controller 70 determines whether the voltage of the quantized signal input from the A / D port 60 is greater than or equal to the first reference voltage, that is, whether the washing machine performs the dehydration mode (S203).

If the voltage of the signal is equal to or greater than the first reference voltage, the controller 70 amplifies the voltage of the signal input from the A / D port 60 at the first amplification factor (S204). The control data corresponding to the voltage of the signal amplified at the first amplification factor is read from the first control data table stored in the memory 85 (S205). That is, the voltage of the signal amplified at the first amplification factor is read first. Match the control data table. Next, the motor driving unit 75 is controlled through the control data read in this way (S206). That is, the motor driving unit 75 is controlled according to the matched result.

The controller 70 determines whether the power applied to the washing machine is OFF (S207), and if the power is not OFF, the voltage of the quantized signal input from the A / D port 60 is the first reference. The flow returns to step S203 for determining whether the voltage is abnormal, and ends when the power supply is OFF.

On the other hand, if the voltage of the signal input from the A / D port 60 is less than or equal to the first reference voltage, the controller 70 determines whether or not the voltage of the signal is greater than or equal to the second reference voltage (S208). That is, it is determined whether the washing mode.

If the voltage of the signal is greater than or equal to the second reference voltage, the controller 70 amplifies the voltage of the quantized signal input from the A / D port 60 at the second amplification factor (S209). The control data corresponding to the voltage of the signal amplified at the second amplification rate is read from the second control data table stored in the memory 85 (ie, S210). Match the control data table. Subsequently, the motor driving unit 75 is controlled through the read control data (S211). That is, the motor driving unit 75 is controlled according to the matched result. In addition, the controller 70 determines whether the power is applied to the washing machine (OFF) (S207) and the subsequent steps.

On the contrary, if the voltage of the signal is less than or equal to the second reference voltage, the controller 70 determines that the quantity detection mode is used and amplifies the voltage of the quantized signal input from the A / D port 60 at a third amplification rate (S212). . The control data corresponding to the voltage of the signal amplified at the third amplification rate is read from the third control data table stored in the memory 85 (S213). That is, the voltage of the signal amplified at the second amplification rate is matched to the second control data table. Next, the motor driving unit 75 is controlled through the control data read in this way (S214). That is, the motor driving unit 75 is controlled according to the matched result. In addition, the controller 70 determines whether the power is applied to the washing machine (OFF) (S207) and the subsequent steps.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

As described above, by the motor control apparatus according to the present invention, the motor according to the present invention has an effect that the driving portion of the motor is accurately controlled corresponding to the position of the rotor of the motor.

In addition, since the driving unit of the motor is precisely controlled corresponding to the position of the rotor of the motor, vibration generated while the motor is rotated is prevented.

In addition, since the driving unit of the motor is precisely controlled corresponding to the position of the rotor of the motor, power consumption of the motor is minimized.

And the torque of the motor is increased.

And there is an effect that the vibration of the rotating tub is prevented by the washing machine and the control method using the motor control device.

In addition, the rotating tub is provided with sufficient rotational force by the washing machine using the motor control device and the control method of the washing machine using the same, thereby improving the washing ability of the laundry.

Claims (12)

motor; A motor driving unit for applying AC power to the motor; A load current detector for outputting a signal corresponding to the magnitude of the load current applied to the motor; And a controller for amplifying the signal output from the load current detecting unit at a predetermined amplification rate, and controlling the motor driving unit according to a result of matching the amplified signal with a preset control data table. And the control unit amplifies the signal output from the load current detection unit at an amplification rate inversely proportional to the voltage magnitude of the signal. The method of claim 1, And a signal output from the load current sensing unit has a voltage proportional to the magnitude of the load current applied to the motor. delete The method of claim 1, And the position control data of the motor is included in the set control data table. Motor to rotate turntable A motor driving unit for applying AC power to the motor; A load current detector for outputting a signal corresponding to the magnitude of the load current applied to the motor; And a controller for amplifying the signal output from the load current detecting unit at a predetermined amplification rate, and controlling the motor driving unit according to a result of matching the amplified signal with a preset control data table. The control unit is a washing machine using a control device of the motor, characterized in that for amplifying the signal output from the load current detection unit with an amplification ratio inversely proportional to the voltage magnitude of the signal output from the load current detection unit.       6. The method of claim 5,      And a signal output from the load current detecting unit has a voltage proportional to the magnitude of the load current applied to the motor. delete      The method of claim 5,     And said set control data table includes position control data of said motor. A signal output step of detecting a load current of the motor rotating the rotating tub and outputting a signal corresponding to the magnitude of the load current; A signal amplifying step of amplifying the output signal at a predetermined amplification rate; And a motor driver controlling step of controlling the motor driver according to the matching result by matching the amplified signal with a preset control data table. The signal amplifying step is a control method of a washing machine using a control device of a motor, characterized in that for amplifying the output signal at an amplification rate inversely proportional to the voltage magnitude of the output signal. The method of claim 9, The signal output step is a control method of a washing machine using a control device of a motor, characterized in that the output signal has a voltage proportional to the magnitude of the load current applied to the motor. delete      The method of claim 9,     The control method of the washing machine using the control device of the motor, characterized in that the motor drive unit control step is matched to the position control data table of the motor included in the preset control data table.

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