JPH041503Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a hybrid circuit for a DC motor rotation speed measuring device.

In the specification and drawings of Utility Model Application No. 58-32632, as shown in FIG. A waveform conversion circuit 3 that detects the pulsating current generated in the power supply circuit and converts it into pulses is connected, and the output pulses are counted by a counter 4, and the rotation speed of the motor is obtained based on the counted value. In the measuring device, by connecting a capacitor 5 to the power supply circuit in parallel with a DC power supply 6, the number of rotations of the motor can be measured even after the power is cut off by a switch 7 until the rotation of the motor completely stops. Disclosed.

However, in order to reversely rotate the DC motor 1, the direction of the current from the DC power supply 6 is changed and the polarity of the motor's armature or field is switched. In some cases, the function of the rotation speed measuring device described above may be impaired. In addition, there is a difference in the presence or absence of the rotation direction switching circuit when the DC motor is used only for forward rotation and when it is used for both forward and reverse rotations. Therefore, the electrical circuit of the rotation speed measuring device is Separate circuits for both reverse and reverse use must be prepared, which is uneconomical and also troublesome in that they must be selected for handling purposes.

In view of the above points, this invention allows the use of basically the same circuit regardless of whether the motor equipped with the rotation speed measuring device is for forward rotation only or for forward and reverse rotation. An object of the present invention is to provide a hybrid circuit that can be easily connected to a DC motor to measure the rotational speed.

Next, an embodiment of this invention will be described based on the drawings from FIG. 2 onwards.

In FIG. 2, 8 is a circuit board constituting a hybrid circuit according to this invention, and has four pairs of terminals 9p, 9n, 10p, 10n, 11p, 11n,
It has 12p and 12n. First pair of terminals 9
p, 9n are motor power input terminals, second pair of terminals 1
0p and 10n are motor power output terminals, terminals 9p and 10p are connected by a jumper wire 13,
The terminals 9n and 10n are connected by a circuit 14, and the jumper wire 13 and the conducting wire 14 are connected via capacitance. Further, an inductance 3a is inserted into the circuit 14 at a portion closer to the terminal 10n than the connection point with the capacitance 5, and the circuit 14 includes a component of a waveform conversion circuit, such as a differential circuit 3.
b, an amplifier circuit 3c, a limiter 3d, and a one-shot multi-vibrator 3e are connected in parallel to the inductance 3a, and each circuit is provided on the substrate 8. And the third pair of terminals 11p,
11n is a power supply terminal for a circuit that requires a drive power source for a waveform conversion circuit, for example, an amplifier circuit 3c, and the fourth pair of terminals 12p and 12n are terminals for outputting the output pulses of the one-shot multi-vibrator 3e to the outside. has been done.

When using the hybrid circuit for rotational speed measurement with the above configuration, the DC power supply 6 is connected to the motor power input terminals 9p and 9n, and the terminals 1a and 1 of the DC motor 1 are 1b is connected, a DC power source 16 separate from 6 is connected to the amplifier circuit power input terminals 11p and 11n, and a counter 4 for counting output pulses is connected to the output terminals 12p and 12n of the one-shot multi-vibrator 3e. 7 is a switch for turning on/off the power of the motor.

When this rotation speed measuring device is used for a motor for both forward and reverse rotation, motor power output terminals 10p and 10n are used.
A rotation direction switching circuit 17 is provided between the DC motor 1 and the DC motor 1.
is provided.

As described above, according to this invention, the capacitance 5 and the inductance 3a that constitute the waveform conversion circuit 3 that detects a pulsating current, converts it into a pulse, and outputs it.
and each circuit 3b to 3e, motor power input terminals 9p, 9n, motor power output terminals 10p, 10
n, the amplifier circuit power input terminals 11p, 11n, and the pulsating current detection pulse output terminals 12p, 12n are carried on one circuit board to form a single hybrid configuration, so the same circuit can be used for unidirectional rotation only. It can be easily connected to either a DC motor or a DC motor for forward and reverse rotation to measure the number of revolutions.

The circuit that switches the rotation direction of the motor is
Since it is installed between the motor power output terminal and the motor outside the hybrid circuit, power is always supplied to the hybrid circuit in a fixed direction regardless of the rotational direction of the motor. Never loses functionality.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing the basic configuration of a motor rotation speed measuring device, and FIG. 2 is a circuit diagram showing an embodiment of this invention. 1... DC motor, 2... Power supply circuit, 3... Waveform conversion circuit, 4... Counter, 5... Capacitance,
6...DC power supply, 8...Circuit board, 9p, 9n~
12p, 12n... terminal, 3a... inductance, 3b... differential circuit, 3c... amplifier circuit, 3d
...Limiter circuit, 3e...One-shot multi-vibrator, 13...Jumper wire, 14...
...Circuit, 16...Power supply.

Claims (1)

[Claims for Utility Model Registration] (a) Four pairs of terminals are provided on the circuit board, (b) the first pair of terminals are used as motor power input terminals for connecting to a DC power supply, and (h) ) The second pair of terminals serve as motor power output terminals for connection to the terminals of the DC motor, and (d) one terminal of the motor power input terminal and one terminal of the motor power output terminal are jumpered. connecting the other terminal of the motor power input terminal and the other terminal of the motor power output terminal with a circuit, and connecting the jumper wire and the circuit via a capacitance; and (e) inserting an inductance in the circuit closer to the motor power output terminal than the connection point with the capacitance, and (e) detecting the pulsating current generated in the circuit at both ends of the inductance and converting it into a pulse. (f) the third pair of terminals serve as power input terminals of the waveform conversion circuit for connecting it to a DC power source; (g) the fourth pair of terminals A hybrid circuit for a motor rotation speed measuring device, characterized in that the circuit has a pulse output terminal for supplying an output pulse of the waveform conversion circuit to a counter.