JPH01126986A - Apparatus for driving pitching machine - Google Patents

Abstract

PURPOSE: To control the speed of a motor for pitching machine for shooting balls, especially control spin balls, by varying the average number of revolutions per unit time of a rotor with the operation of one volume control. CONSTITUTION: A voltage obtained by dividing an output of a circuit corresponding to a motor average speed varying signal part 13 and a speed varying volume control 14 with a spin varying volume control VR5 is applied to a base of a transistor TR11 and a base of a transistor TR13. When a voltage division ratio with the spin varying volume control VR5 is large, a difference will not exceed a fixed value between a base voltage of the transistor TR11 and a base voltage of the transistor TR13. As a result, a difference will not exceed a fixed value between the number of revolutions of a motor A and that of a motor B. Thus, even if an operation is made to increase the average speed of a rotor or to increase the degree of spinning with the spin varying volume control, a proper degree of spinning will not be exceeded. This allows a user to shoot a spin ball easily with the shooting speed or the flying distance varied.

Description

[Detailed description of the invention] (Industrial application field) The present invention drives two rotors with two motors,
This invention relates to motor speed control of a pitching machine such as a soccer machine that shoots a ball, and particularly relates to control of spin balls.

(Prior art) Conventional methods for launching spin balls include creating a difference in rotor rotational speed using a mechanism such as a belt, or adjusting two sets of independent motor speed control devices to create a difference in rotor rotational speed. However, the amount of spin (difference in rotor rotation speed) was fixed and adjustment was difficult.

(Problem to be solved by the invention) Two sets of motor speed control devices are adjusted separately to create a difference in rotor rotation speed, and the amount of spin is fixed, and it takes a long time to make adjustments. It was very difficult.

(Means for solving the problem) The spin rate of a pitching machine does not necessarily have to be large; it is sufficient that the spin rate be a certain amount even if the average rotor rotational speed exceeds a certain value. The present invention has achieved this, and can produce a spin ball with a varied rotor average rotational speed (equivalent to launch speed and flight distance) by operating a single volume without adjusting the spin rate. Furthermore, when it is desired to vary the amount of spin, it is possible to do so by operating one other volume.

(Example) Embodiments of the present invention will be described based on the drawings.

FIG. 1 is a control block diagram of the present invention. 1 is a commercial power source (or a power source obtained from a generator with an engine), 2 is a noise prevention circuit, 3 and 7 are a mixed bridge consisting of 2 diodes and 2 SCRs, 4 and 8 are SCR on phase control units,
5 and 9 are feedback parts, 6 and 10 are commutator motors, 11 is a signal DC power supply, 12 is a power synchronization signal generation part, 13 is a motor average speed variable signal part, 14 is a speed variable volume, 15 is a power-on power supply Soft start signal section, 1
6 is a spin control signal section, and 17 is a spin variable volume.

FIG. 2 is a detailed circuit diagram, and will be explained in comparison with FIG. 1. The varistor NRI, the inductors L1 and L2, and the capacitors C9 and 010 correspond to the noise prevention circuit 2, which prevents external noise, noise generated by the motor brush, and noise generated when the SCH is turned on and off from entering and exiting. 5CRI, 5
CR2, diodes D15 and 016, capacitor C1
and C2, resistors R1, R2 and R3 correspond to the mixing bridge 3 and control the phase of the motor A. 5CR3,5CR4
, diode D2B and C29, capacitor C5 and C
6. Resistors R14, R15 and R16 correspond to a mixing bridge 7 and control the phase of motor B.

PUT (programmable unijunction transistor hereafter referred to as PUT) l, transistors TRI and TR2, diodes D17 and Di8, resistors R4 and R5
, R6, R8, and capacitor C3 correspond to the SCR on-phase control section 4, and P set by the spin control signal section described later.
Depending on the UTI anode voltage, 5 CRI and 5
Turn on CR2. PUT2, transistors TR4 and TR5, diodes D17 and C18, resistors R17゜R18, R19, R21, and capacitor C7 correspond to the SCR on-phase control section 8, and correspond to the PUT2 anode voltage set by the spin control signal section described later. 5CR3 in phase
and turn on 5CR4.

Resistors R9, R1O, R11, R12 and R13, capacitor C4, diodes DI, D4. D5 and D6, the Zener diode ZD1, and the transistor TR3 correspond to the feedback section 5, which applies the back electromotive force signal of the motor A to the gate of the aforementioned PUTI. Resistance R22, R23
, R24, R25 and R26, capacitor C8, diode DB, D11, C12 and C13, Zener diode ZD2, and transistor TR6 are the feedback section 9.
The counter electromotive force signal of motor B is applied to the gate of PUT2 mentioned above. Resistor R7 and diode D2 allow a holding current to flow even when the brush contact of motor A becomes momentarily unstable, allowing 5CRI and 5CR2 to operate normally. The same applies to the resistor R20 and the diode D9. Diodes D3 and D7. Dlo and C14 are for reflux.

The power transformer TFi, diode bridge DB1, diode D19, and capacitor 011 are the signal DC power supply 11.
This corresponds to a power supply with smoothed double-wave rectification. Resistors R27, R28, R29, R30, R31, R44 and R49 Zener diode ZD3, transistor T! l
LT, TRI 2. TR14 is the power supply synchronization signal generator 1
2, a synchronizing signal is generated near zero volts of the AC power supply, and this signal resets the anodes of PUTL and PUT2 described above.

Resistors R33, R34, R35, R51 and R52°R5
3. Capacitors C13, C14, diode D22. D
23. D24. C25, Zener diode ZD6, and transistors TR8, TR9, and TRL5 correspond to the soft start signal section 15 when the power is turned on, and drive the motor at a low speed for several seconds after the power is turned on.

Resistors R32, R36, R54 and R37, semi-fixed resistance V
RI, variable volume VR4 (speed variable volume 14
), diode D20. D21 and transistor TR10 correspond to the motor average speed variable signal section 13, and V
The speeds of the two motors A and H are varied by operating H2.

Resistance R38~R43, R45~R48, semi-fixed resistor VR
2, VR3, variable poly z, VR5 (corresponding to X pin variable volume 17), diodes D26, D27, Zener diode ZD4. ZD5゜ZD7. ZD8, capacitors CI6 to C19, transistors TRII, TR
13 corresponds to a spin control signal section 16, which generates a signal voltage difference according to a change in VH2, and sends this to PUTl and PUT2.
is applied to the anode.

With the above configuration, the operation will be explained next.

The circuit section in FIG. 2-(B) corresponding to the SCRC rheo-phase control section 4 and the feedback section 5 converts the back electromotive force generated in proportion to the speed of the motor A into 5 CRI and 5 CRI in the feedback section.
When CR2 is off (when on, transistor TR3 is turned on and no comparison is made), apply it to the gate of PUTI and compare it with the anode voltage corresponding to the set speed (triangular wave synchronized with the power supply), and find that the speed of motor A is lower than the setting. When the back electromotive force becomes smaller, PtJTl turns on earlier than when it is stable, advancing the on phase of 5CR1 and 5CR2, and motor A
When the speed of motor A is higher than the setting and the back electromotive force becomes large, PUTI turns on later than when it is stable, which increases the speed of 5CRI and 5CR2. It operates to delay the on phase, reduce the voltage applied to motor A, and lower the speed of motor A. The operations of the SCR on-phase control section 8 and the feedback section 9 are the same as those in 4.5, so Fig. 2-(
The explanation of C) will be omitted. The second corresponding to mixing bridge 3
The circuit section in Figure-(B) turns on the transistor TRI when PUTI is turned on, and applies a signal to the gate to generate 5C.
A diode D15.RI and 5CR2 are turned on alternately. This is a mixed bridge circuit with D16. The operation of the mixing bridge 7 is similar to 3.

The operation of the circuit shown in FIG. 2-(D) corresponding to the spin control signal section 16 will be explained.

Base of transistor TRII and transistor TR1
A voltage obtained by dividing the output of the circuit shown in FIG. 2-(A) corresponding to the motor average speed variable signal unit i3 and speed variable volume 14 by a spin variable volume VR5 is applied to the base of 3. When the output voltage of the transistor TR10 is increased by the diodes ZD7 and ZD8, and the voltage division ratio by the spin variable volume VR5 is large, the base voltage of the transistor TRII and the transistor TR13 are increased.
The difference in base voltage does not exceed a certain value.

Therefore, PUT via the emitter of transistor TRII
The difference between the anode voltage applied to I and the anode voltage applied to PUT2 via the emitter of transistor TR13 does not exceed a certain value, and as a result, the difference between the rotation speed of motor A and the rotation speed of motor B also does not exceed a certain value. Do not exceed a certain value.

The transistors TR12 and TRI4 are turned on in synchronization with the power supply by the output of the power supply synchronization signal generation section corresponding to the power supply synchronization signal generation period 12, and the transistor TR7.
Always reset the anodes of PUTI and PtJT2.
Turn on 5CRI to 4 in phase synchronized with the power supply.

Note that spin control using a triac, which is an AC element, instead of the SCH is also possible.

(Effects of the Invention) As described above, when firing a spin ball with a pitching machine using the drive device of the present invention, the rotor average speed is increased or the spin variable volume is operated to increase the amount of spin. However, since the amount of spin does not exceed an appropriate amount, the user can easily shoot spin balls with different shooting speeds (or flight distances).

As explained above, with the configuration of the device of the present invention, it is possible to suppress the speed difference between the two motors within a certain range, so even if the launch speed (or flying distance) of the spin ball changes, the spin The operation becomes easy as there is no need to make any adjustments. Also, you can always shoot a stable spin ball.

[Brief explanation of the drawing]

Fig. 1 is a control block diagram of the present invention, Fig. 2-(A) is a power supply and average speed control section, Fig. 2-(B) is a motor A drive and feedback section, and Fig. 2-(C) is a motor B Drive and Feedback Section, FIG. 2-(D) is the spin control section. In the figure, 4...SCRC rheophase control section, 8...SCR
C rheo phase control section, 13... Motor average speed variable signal section, 14... Speed variable volume, 15... Soft start signal section at power-on, 16... Spin control signal section, 17... It is a spin variable volume.

Claims (1)

[Claims] In a pitching machine drive device that includes a speed control device that controls a plurality of independent phases, and a pitching machine drive device that rotates a rotating body with each motor driven by the speed control device, the speed control device includes a plurality of independent speed setting devices. The pitching machine driving device as described above, further comprising a spin control signal device interconnected with a plurality of constant voltage elements that limit the amount of spin to a maximum amount.