KR20070088951A - Apparatus for controlling the driving state of a motor in a bill recycling machine and method for operating the same - Google Patents

Abstract

A motor driving control device in a bill depositing and drawing machine and an operation method thereof are provided to keep constant speed of a motor by controlling driving voltage to output desirable rotational speed of the motor, and to smoothly deposit and draw the bills by securing constant rotational speed of the motor although the motor is aged. A motor driving control device in a bill depositing and drawing machine for controlling motors(83a,83b,83c) driving a roller transferring bills is composed of the motor driving the roller or a gear transferring the bills from the bill depositing and drawing machine; state sensing units(81a,81b,81c) detecting a state signal supplied from the bill depositing and drawing machine to the motor and supplying the state signal to a control unit(80); the control unit calculating RPM(Revolution Per Minute) of the motor by receiving the state signal supplied from the state sensing unit and controlling the motor by lowering driving voltage if the RPM of the motor is higher than reference RPM and increasing the driving voltage if the RPM of the motor is lower than reference RPM; and motor driving circuits(82a,82b,82c) supplying driving pulse for driving the motor, according to a control signal of the control unit.

Description

Apparatus for controlling the driving state of a motor in a bill recycling machine and method for operating the same}

1 is a schematic diagram of a general banknote deposit and withdrawal device.

2 is a block diagram showing a motor drive control device in the banknote deposit and withdrawal device according to the present invention.

3 is an exemplary table showing a drive voltage / rpm database.

4 is a flowchart illustrating a driving voltage control process for outputting a constant rotational speed of a motor according to the present invention.

* Explanation of symbols for the main parts of the drawings

80: control unit 81: state detection unit

82: motor drive circuit 83: motor

84: drive voltage / rpm database

The present invention relates to a motor drive control device and a method of operating the same in a banknote deposit and withdrawal device, characterized in that for controlling the drive voltage of the motor to output a reference rotational speed by measuring the rotational speed of the motor per minute

 In general, banks and other financial institutions are installed in convenience stores and public places in addition to banks to provide customers with convenient financial services to banks and other financial institutions, so that customers can freely withdraw cash using their own cash service cards or credit cards. One device.

As described above, the banknote deposit and withdrawal device having the deposit and withdrawal function separates the banknotes put by the user at the time of deposit into the conveying unit by separating them one by one, and rejects the banknotes determined as unacceptable after determining the authenticity of the conveyed banknotes. It must be returned to the user, so it must be equipped with a function to accumulate bills in the deposit and withdrawal. In this method, a temporary storage unit is provided to store the rejected banknotes, and after all the banknotes are separated, the banknotes stored in the temporary storage unit are accumulated in the storage unit of the sunrise portion, or the banknotes that are rejected without the temporary storage unit are withdrawn. A method of directly integrating the accommodating portion is used.

In addition, the deposit and withdrawal unit of the banknote deposit and withdrawal device has a function of storing unacquired banknotes in the collection warehouse when the user does not acquire the rejected banknote at the time of deposit or the banknote accumulated in the withdrawal time storing unit.

1 is a schematic diagram of a general banknote deposit and withdrawal device.

As shown in the figure, the banknote withdrawal device of the present invention is a deposit and withdrawal unit 10 for the user to put or obtain a banknote for the withdrawal and withdrawal, and a conveying path 20 for transporting the banknotes withdrawal and withdrawal through the withdrawal and withdrawal section 10 ), A bill detection and discrimination unit 30 for checking an abnormality of bills to be withdrawn and withdrawn, the temporary storage unit 40 temporarily stored before the bills are returned to the deposit and withdrawal unit 10 at the time of withdrawal and withdrawal, There is not enough space in the bill return part 50 for storing bills to be received and withdrawn at the same time, the bill recovery part 60 for receiving uncollected bills from the deposit and withdrawal part 10, and the bill return part 50. And a banknote replenishment unit 70 in which banknotes for replenishing the banknote or the banknote reflowing unit are accommodated. In addition, although not shown in the drawings, a control unit for controlling the entire banknote deposit and withdrawal device including the above configuration is included.

The deposit and withdrawal unit is provided with a feed roller for transferring the banknotes transferred to the conveying path, a motor for driving the gate roller, a step motor for driving the pinion gear and the rack gear, and the conveying path is withdrawn through the deposit and withdrawal unit 10. A plurality of motors are used to drive a plurality of rollers for transferring bills to the bill returning unit 50, the bill collecting unit 60, and the bill supplementing unit 70.

In the banknote device, a plurality of motors must be driven at a desired speed according to a control signal of a controller so that a plurality of rollers and gears are driven at an appropriate timing to smoothly deposit and withdraw money and shorten the time required for banknotes. . However, even if a constant reference driving voltage is applied from the motor driving circuit, a difference in driving speed of each motor occurs according to the individual characteristics or states of the plurality of motors, which leads to an error in the driving timing of the rollers engaged with each other, resulting in an error in banknotes Will occur. In particular, when the life of the motor or the jam occurs in the motor, even if the reference driving voltage is applied to the motor there was a problem that does not achieve the desired revolution per minute (RPM). For example, if the reference drive voltage is given to 3 [V], if the motor is operated at 2000 RPM even if the motor is operated at 1800 RPM at the 3 [V] reference drive voltage due to the aging of the motor, it may cause a malfunction of the bank teller machine. There was a problem.

In order to solve the above problems, the present invention is proposed, by detecting a state signal of the motor in the banknote and withdrawal device, and proposes a device and a control method for providing a drive voltage of the motor to output a constant speed of the motor It is done.

In order to achieve the above object, the present invention, the motor for driving the roller or gear for transferring the banknote in the banknote input and output device, and a state sensing unit for detecting the state signal supplied to the motor from the banknote input and output device to supply to the controller And, receiving the state signal supplied from the state detection unit calculates the rotational speed of the motor from this, and if the rotational speed of the motor is higher than the reference rotational speed per minute, the driving voltage is lowered, than the reference rotational speed And a control unit for controlling the motor by raising the driving voltage, and a motor driving circuit for supplying driving pulses for driving the motor according to the control signal of the control unit.

In another aspect, the present invention, the process of providing a predetermined drive voltage to the motor to obtain a reference rotational speed, the process of calculating the rotational speed of the motor per minute by sensing the state signal of the motor, and the calculated rotational per minute If the speed is higher than the reference rotational speed per minute, the driving voltage is lowered, and if the lower than the reference rotational speed per minute, the driving voltage is raised, thereby including the step of reaching the reference rotational speed.

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

2 is a block diagram showing a motor drive control apparatus in a banknote deposit and withdrawal device according to the present invention.

As shown in Figure 2, the motor drive control device for controlling the rotational speed of the motor for driving the rollers or gears for moving the bills, the control unit 80, the state detection unit (81; 81a, 81b, 81c), the motor drive circuit (82; 82a, 82b, 82c) and motors 83; 83a, 83b, 83c.

The state detector 81 detects motor state information such as an encoder signal of the motor 83 and transmits the detected state to the controller. The encoder signal measured by the motor is transmitted to the control unit, which is used to calculate the revolution per minute (RPM) of the motor.

The motor driving circuit 82 is a driver providing a driving pulse of the motor and performs a function of providing a driving pulse for controlling the rotational speed of the motor according to the driving control signal of the controller. In order to lower the rotational speed of the motor, the voltage (driving voltage) of the provided driving pulse is lowered, while in order to increase the rotational speed, it is possible by increasing the provided driving voltage. The driving voltage is possible by adjusting the duty ratio. A duty ratio of 100% yields a maximum rotational speed, and a 50% duty ratio means 1/2 of the maximum rotational speed.

The controller 80 controls the voltage (driving voltage) of the driving pulse output from the motor driving circuit by calculating the rotational speed per minute of the motor according to the encoder signal of the motor 83 provided from the state detecting unit 81. Perform. That is, when the rotational speed per minute (RPM) of the motor is calculated using the encoder signal, when the rotational speed per minute corresponding to the measured driving voltage measured by the motor due to the aging of the motor is not, the motor driving circuit It has an algorithm to increase the driving voltage output in order to have the desired rotational speed per minute. For example, although 3 [V] driving voltage is provided to operate at 2000 [RPM] in a normal motor, when less than 1800 [RPM] comes out due to the aging of the motor, the motor until 2000 [RPM] is outputted. Step by step to increase the driving voltage. The rotational speed per minute of the ideal type of motor can be known based on the driving voltage / rpm database.

The driving voltage / rpm speed database 84 is a database storing the required revolutions per minute according to each driving voltage as a table. In the case of a normal motor, the driving speed / rpm speed database (RPM) must be driven according to each driving voltage. Database. A table example of the drive voltage / rpm database is shown in FIG. 3. Referring to FIG. 3, when the driving voltage 3 [V] is provided, the preferred rotational speed of the motor is 2000 RPM, and when the driving voltage 4 [V] is provided, the preferred rotational speed of the motor is set to 2500 [RPM]. It should be possible.

4 is a flowchart illustrating a process of detecting the rotational speed of the motor in the motor drive control apparatus and controlling the rotational speed of the motor according to the present invention.

First, in order to obtain a desired rotational speed, the controller provides a driving voltage to the motor through the motor driving circuit to generate a corresponding rotational speed (S91). Thereafter, the control unit receives an encoder signal measured by the motor through the state detection unit (S92). Using the provided encoder signal, the rotational speed per minute of the motor is calculated (S93), and it is determined whether the calculated rotational speed matches the normal rotational speed per minute which can be output by the provided driving voltage (S94). This can be determined using the drive voltage / rpm database. For example, if a drive voltage of 3 [V] is provided, 2000 [RPM] can be output from a normal motor. To judge. If 1800 [RPM] is detected in the motor despite the fact that the motor is aging and provides 3 [V] driving voltage, the driving voltage is sequentially increased / decreased in a predetermined step (S95) so that the desired speed of rotation of the motor is 2000. Get [RPM].

As mentioned above, although this invention was demonstrated in detail using the preferable embodiment, the scope of the present invention is not limited to a specific embodiment and should be interpreted by the attached claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

As described above, the present invention can maintain the constant speed of the motor by controlling the driving voltage to detect the state signals of the motors and output the desired rotational speed of the motor in the banknote device. In addition, despite the aging of the motor by ensuring a constant rotational speed of the motor, there is an effect that the deposit and withdrawal of the bill smoothly made.

Claims (4)

In the motor drive control device in the bill input and output device for controlling the motor to drive the roller for transporting the bill in accordance with the deposit and withdrawal of the bill, A motor for driving a roller or a gear for transferring banknotes from the banknote input / output device; A state detector for detecting a state signal supplied to the motor from the banknote input / output device and supplying the state signal to the controller; Receives the state signal supplied from the state detection unit to calculate the rotational speed of the motor from this, and if the rotational speed of the motor is higher than the reference rotational speed per minute lowers the drive voltage, if the lower than the reference rotational speed A control unit for controlling the motor by raising the driving voltage; A motor driving circuit which supplies a driving pulse for driving the motor according to a control signal of the controller; Motor drive control device in a bill input and output device provided with. The motor drive control apparatus according to claim 1, wherein the state signal is a current, voltage, or encode signal. Providing a motor with a predetermined driving voltage to obtain a reference rotational speed per minute; Calculating a rotational speed per minute of the motor by detecting a state signal of the motor; When the calculated rotational speed per minute is higher than the reference rotational speed lowers the driving voltage, on the contrary, if the lowering rotational speed per minute lowers the driving voltage, the process to reach the reference rotational speed per minute Rotational speed control method of a motor comprising a. The method of claim 3, wherein the reference rotational speed is reached by increasing or decreasing the driving voltage in order of predetermined steps.

Images