KR20030009946A - An apparatus for controlling the motor driving voltage - Google Patents

Abstract

PURPOSE: An apparatus for automatically controlling a motor voltage is provided to stably control the motor speed by changing a motor driving voltage from a lower voltage to a high voltage according to a load change of a motor. CONSTITUTION: A power supply(10) outputs a lower voltage and a high voltage. A motor controller(40) drives a motor(30). A microcomputer(50) continues to estimate a load change of the motor(30) and changes a voltage applied to the motor(30) from the lower voltage to the higher voltage. A voltage down(70) adjusts the lower voltage from the power supply(10) to a usage voltage of the microcomputer(50). The microcomputer(50) detects an amplitude of the lower voltage supplied to the voltage down(70) based on the voltage adjusted by the voltage down(70). When an amplitude of the detected lower voltage is greater than a predetermined voltage, the microcomputer(50) maintains Vcc at a high level, and a switching status of a switching circuit(20) to continuously apply the lower voltage to the motor(30).

Description

An apparatus for controlling the motor driving voltage}

The present invention relates to an automatic motor voltage control apparatus for estimating load variation of a motor and changing a voltage applied to the motor from a low voltage to a high voltage.

In general, the motor driving device applies a high Vcc voltage to the motor to drive the motor at high speed, and applies a low Vcc voltage to the motor to drive the motor at low speed. As follows.

1 shows a configuration of a general motor voltage control device, which includes a power supply unit 10 for supplying power supplies 12V and 24V; A switching circuit 20 which selects one of the output voltages of the power supply unit 10 and applies it to the motor 30; A motor controller 40 for driving the motor 30; An input unit 60 such as a keypad and a remote controller; And a microcomputer 50 for controlling the switching circuit 20 in response to a request through the input unit 60.

FIG. 2 illustrates a flow of a conventional motor voltage control method performed in the apparatus of FIG. 1, and the driving method of FIG. 2 will be described below with reference to the configuration of FIG. 1.

In the motor driving apparatus configured as described above, first, the power supply unit 10 outputs voltages of 12V and 24V, respectively, and the motor control unit 40 drives the motor 30, and the driven motor 30 is driven. In the state where the output voltage of 12V is being applied through the switching circuit 20 (S1), when the user requests a specific operation through the input unit 60, the microcomputer 50 accordingly The operation mode of 30 is determined. For example, when the requested operation is fast forward (FF) or rewind (REW), the microcomputer 50 sets the operation mode of the motor 30 to a high speed mode. If the requested operation is a play or the like, the microcomputer 50 determines the operation mode of the motor 30 as the low speed mode.

When the determined operation mode of the motor 30 is the high speed mode (S2), the microcomputer 50 enables the Vcc to 'H' so that the Vcc voltage can be applied to the motor 30. In operation S3, the switching circuit 20 is controlled so that a high voltage of 24 V is applied to the motor 30 among the input voltages of the switching circuit 20 (S4). In operation 50, Vcc is enabled as 'H' as described above (S5), and then the switching circuit 20 is controlled to apply a low voltage of 12 V to the motor 30 (S6).

However, in the conventional motor driving apparatus configured as described above, since the high voltage or the low voltage is simply applied to the motor according to the operation mode of the motor irrespective of the actual load fluctuation of the motor, if the motor is under the low voltage applied to the motor When the load variation occurs in the motor control voltage flow occurs largely, there was a problem in that the locking (Locking) time is long.

Accordingly, the present invention has been made to solve the above problems, by providing a motor voltage automatic control device to achieve a stable speed control of the motor by varying the motor drive voltage from a low voltage to a high voltage according to the load change of the motor. The purpose is to.

Figure 1 shows the configuration of a general motor voltage control device,

Figure 2 shows the flow of the conventional motor voltage control method made in the apparatus of Figure 1,

Figure 3 shows the configuration of a preferred embodiment of the automatic motor voltage control apparatus according to the present invention,

FIG. 4 shows a flow of a method for automatically controlling motor voltage in the apparatus of FIG. 3.

※ Explanation of symbols for main parts of drawing

10: power supply unit 20: switching circuit

30: motor 40: motor control unit

50: microcomputer 60: input unit

70: voltage regulator

Automatic motor voltage control apparatus according to the present invention for achieving the above object, the voltage supply means for supplying a low voltage and a high voltage for driving the motor; And control means for estimating the load variation of the motor and varying the voltage applied to the motor from the low voltage to the high voltage according to the estimated variation.

Hereinafter, an embodiment of an automatic motor voltage control apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram of a preferred embodiment of the automatic motor voltage control apparatus according to the present invention. In the same configuration as in FIG. 1, the microcomputer 50 outputs a low voltage (12V) output from the power supply unit 10. It further comprises a voltage adjusting section (Voltage Down) 70 to adjust the output voltage to be used.

Figure 4 shows the flow of a preferred embodiment of the automatic control method of the motor voltage according to the present invention, the following describes the control method of Figure 4 according to the present invention in detail with reference to the configuration of FIG.

First, the power supply unit 10 outputs a low voltage (12V) and a high voltage (24V), respectively, the motor control unit 40 drives the motor 30, the low voltage output to the driven motor 30 In the state of being applied through the switching circuit 20 (S10), the microcomputer 50 continuously estimates the load variation of the motor 30 and accordingly calculates the voltage applied to the motor 30. It is variable from the low voltage (12V) to the high voltage (24V), when the speed is increased while the speed of the motor 30 is constant, the output of the motor 30 is increased and the motor 30 is required As the amount of current increases, the magnitude of the Vcc voltage applied to the motor 30 decreases, and when the Vcc voltage applied to the motor 30 decreases below a predetermined voltage, it flows to the motor 30. Since the amount of current is limited to the motor 30 This is because the speed of the motor 30 may not increase to a target speed even when the applied voltage is changed to a high voltage.

Therefore, the microcomputer 50 continuously estimates the load variation of the motor 30 to change the voltage applied to the motor 30 from a low voltage to a high voltage, which is as follows.

The voltage adjusting unit 70 adjusts and outputs a low voltage output from the power supply unit 10 to a use voltage of the microcomputer 50 (for example, 5V). Accordingly, the microcomputer 50 outputs the adjustment output. The magnitude of the low voltage supplied to the voltage adjusting unit 70 is detected from the voltage, and when the detected magnitude of the low voltage is equal to or greater than a predetermined voltage (12 V voltage) (S20), first, Vcc is 'H' (enabled). After maintaining (Enable) state (S21) to maintain the switching state of the switching circuit 20 as it is so that the low voltage is continuously applied to the motor 30 (S22).

However, if the detected magnitude of the low voltage is smaller than the predetermined constant voltage (10V) (S30), the microcomputer 50 maintains Vcc in the 'H' state as described above (S31) and the switching circuit ( 20 to control the high voltage (24V) output from the power supply unit 10 to the motor 30 (S32). As the load of the motor 30 changes, that is, when the load of the motor 30 becomes large (load resistance decreases), the driving voltage of the motor 30 is automatically changed from a low voltage to a high voltage.

The above-described preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve, change, and substitute various other embodiments within the technical spirit and scope of the present invention disclosed in the appended claims below. Or addition may be possible.

Motor automatic voltage controller according to the present invention configured as described above, by varying the voltage applied to the motor according to the load change of the motor from a low voltage to a high voltage, the output of the motor can be most optimized, when changing the speed of the motor It is a useful invention that can reduce the locking time by quickly reaching the target speed.

Claims (6)

In a motor drive, Voltage supply means for supplying a low voltage and a high voltage for driving the motor; And And control means for estimating the load variation of the motor and varying the voltage applied to the motor from the low voltage to the high voltage according to the estimated variation. The method of claim 1, And the load variation estimation is performed based on a change in magnitude of a low voltage supplied from the voltage supply means. The method of claim 1, And the control means changes the voltage applied to the motor from the low voltage to the high voltage when the magnitude of the low voltage supplied from the supply means is smaller than a predetermined low voltage value. The method of claim 1, And the control means continuously maintains the voltage applied to the motor at the low voltage when the magnitude of the low voltage supplied from the supply means is equal to or greater than a predetermined low voltage value. The method of claim 1, It further comprises a voltage adjusting means for adjusting and outputting the low voltage supplied from the supply means to the use voltage of the control means, And the control means detects the magnitude of the supplied low voltage from the regulated output voltage and accordingly varies the voltage applied to the motor to a high voltage. The method of claim 1, It further comprises a switching means for selecting any one of the low voltage and high voltage supplied from the supply means to apply to the motor, When the magnitude of the low voltage supplied from the supply means is smaller than a predetermined low voltage value, the control means converts the switching state of the switching means to change the voltage applied to the motor to a high voltage. Automatic control.