SU840988A1 - Device for signalling electric motor state - Google Patents

Description

the contacts of the switch, the movable contact of which is connected to the positive power supply bus, the negative bus of which is connected to the motor pole, the switching and signal elements, the signal elements are made in the form of two LEDs, the anode and cathode of the first of which are connected, respectively, to the positive power source bus and to the moving contact of the first switching element, the cathode and the anode of the second LED are connected, respectively, to the negative power supply bus bar and the moving contact of the second switch guide member, fixed contacts of the switching elements are connected in pairs by and connected to the fixed contacts of the switch.

The drawing is a schematic diagram of the device.

The device contains a direct current motor consisting of a core 1 connected to the excitation windings 2 and 3, to the terminals of which limit switches 4 and 5 are connected. The limit switches are connected to the fixed contacts of the switch 6, the moving contact of which is connected to the positive source bus 7 power supply, to which the anode of the LED 8 is connected, the cathode of which is connected to the moving contact of the first switching element 9, the fixed contacts of which are connected to the fixed contacts of the second switching element 10, the movable contact of which is connected to the anode of the LED 11, and the cathode of the LED is connected to the negative bus 12 of the power supply.

The device works as follows.

Consider the mode in which the motor is in the extreme position, in which the limit switch 4 is closed and the limit switch 5 is open.

After supplying the power supply plus power through the power supply bus 7, through the closed contacts of the switch b and the limit switch 4 is fed to the excitation winding 3 and the meas 1. At this, the electric motor starts to rotate and simultaneously lights up the LED 11 7 of the source of supply through the closed contacts of the switching element 10 and the perelyatel b. LED 8 will be illuminated, because at the time of starting the electric motor, the limit switch 5 is open, and after it is closed, during the testing of the electric motor, the LED by its cathode appears to be connected to the divider of April, formed by the excitation winding and King 1, in which

the voltage falls mainly on measles, and the potential difference across the anode and cathode of the LED 8 is insufficient to lighten it.

When the motor reaches the extreme position, the limit switch 4 is opened and the motor stops. The LED 8 is connected to the negative bus 12 of the power source through de-energized measles 1 and excitation winding 2. So

As the ohmic resistance of the core and excitation winding is small, the LED is under the full voltage of the power supply and starts to glow.

To return the motor to the initial position, switch 6 is shifted to a position in which power is supplied to the motor through limit switch 5. Simultaneously with switch b, the switching elements 9 and 10 must switch. Synchronous operation of the switch and switching elements is provided differently depending on the type used. instrumentation. For example, if a contactor or an electromagnetic relay is used as a switch, then other contact groups of the same contactor or relay can become switching elements. If the control is carried out by a manual switch, then contact groups mechanically associated with this switch or other contact groups of the switch itself can be used as switching elements.

From the moment of supplying the voltage, as in the case under consideration, the LED 11 starts to glow, and from the moment of switching off the electric motor, the limit switch 5 also lights up the LED.

Thus, the device allows to obtain information about the voltage applied to the motor (by the glow of the LED 11) and about the achievement of the extreme positions by the motor (by the glow of the LED 8) The device contains a limited number of elements, the circuit diagram is simple and reliable.

Formula

the invention

A device for signaling the state of an electric motor, containing limit switches, one of the terminals of which is connected to the motor windings, and the other terminals are connected to fixed contacts of the switch, the moving contact of which is connected to the positive power supply bus, the negative bus of which is connected to the motor's terminal, switching and signal elements, characterized in that, in order to increase the reliability of the signaling device, in it the signal elements are made in the form of two LEDs, an anode and The cathode of the first of which is connected, respectively, to the positive power supply bus and to the movable contact of the first switching element, the cathode and anode of the second LED are connected, respectively, to the minus, power supply bus and movable contact of the second commutating element, fixed contacts of the switching elements connected in pairs and connected to fixed koitakTciM switch.

Sources of information taken into account in the examination

1. USSR author's certificate number 477434, cl. 6 08 25/00, 1973.

2. USSR author's certificate number 410428, cl. G 08 B 25/00/1972 (prototype),

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Claims (2)

Claim A device for signaling the state of the electric motor, containing limit switches, one of the terminals of which are connected to the motor windings, and the other terminals are connected to the fixed contacts of the switch, the movable contact of which is connected to the plus bus of the power supply, the negative bus of which is connected to the armature of the electric motor, switching and signal elements, characterized in that, in order to increase the reliability of the device’s alarm, the signal elements in it are made in the form of two LEDs, an anode and a cat One of the first of which is connected, respectively, to the positive bus of the power source and to the movable contact of the first switching element, the cathode and anode of the second LED are connected, respectively, to the negative, bus of the power source and the movable contact of the second switching element, fixed contacts of the switching elements are connected pairwise and connected to the fixed contacts of the switch. 5 Sources of information taken into account in the examination 1. USSR copyright certificate No. 477434, cl. G 08 B 25/00, 1973. 2. USSR copyright certificate 10 No. 410428, cl. G 08 B 25/00/1972 (prototype).