DE2604918A1 - Automatic restarter for syn. permanent magnet coupling - is driven by motor by resistance variations caused by component sensitive to magnetic field - Google Patents

Abstract

The magnet coupling has an outer driving magnet part, an inner driven magnet part and a pressure-proof housing between the two. When the inner magnet part rotates, a resistance variation is induced in a magnetic field sensitive resistor. These variations are amplified and converted by the following trigger (2) into digital pulses applying through a monostable flip-flop (3) a control pulse to a NAND gate (4). It allows flip-flop (5) pulses to pass through the NAND gate when the inner magnet part is stationary. This periodically switches on and off the motor relay (6). After a certain number of ineffective starting attempts, the NAND gate (4) is blocked and the motor switched off altogether.

Description

Additional patent application

Device for the automatic restarting of a falling out of step Lenen synchronous permanent magnet clutch The invention relates to a device for automatic restarting of an except driven by an electric motor Stepped synchronous permanent magnet coupling for pressure-resistant rotary stirrer with driving Outer magnet part, driven inner magnet part and a pressure-resistant housing between both according to the main patent 1905322. According to this the automatic monitoring by means of inductive pick-up with subsequent amplifier and subsequent signal processing module from conventional electrotechnical components.

The subject of the additional patent application is a fully electronic version Design In digital technology, which with the rotating internal magnet part in the stationary Magnetic-dependent resistance caused resistance change via an amplifier and a subsequent trigger circuit converts it into digital pulses, which upper the monostable multivibrator conduct a control pulse to the NAND gate unit, the path of the pulses of the astable flip-flop circuit when the inner magnet part is at a standstill enabled by the NAND gate unit and thereby periodically activates the motor relay and switches off and after a certain number of unsuccessful start-up attempts The NAND gate unit blocks the pulse counter and thus switches off the motor.

The advantage over the main application is that the complete Circuit can be built on a board, is cheaper to manufacture and extended the automatic monitoring range to even lower speeds.

2. Page ddr Patet-ZtAsEtzadmelStJng The invention is intended with the help can be explained in more detail in the drawing.

A stationary magnet-dependent resistor is used as the probe (1), the change in resistance associated with the pole change of the rotating inner magnet part Is amplified by a transistor amplifier. The resulting pulsating DC voltage is transformed in the subsequent trigger circuit (2) into digital impulses, which can now be further processed as required.

The monostable multivibrator (3) registers the pulse train and sends a continuous pulse to the NAND gate unit down to a minimum number of pulses (4). This has the effect that there is an O-signal at the output and the Relct s (6) in the rest position remain. If the impulses are absent due to the standstill of the internal magnet, it remains also the continuous pulse away, whereby the NAND gate unit (4) paves the way for the her connected astable Kippscholtung (5) releases. Their on-off impulses work directly on the relay (6) and alternately switch the drive motor on and off. A pulse counter controls a certain number of unsuccessful start-up attempts (7) a permanent pulse in the NAND gate unit, which the relay (6) in Arl) eitsstellung brings and thus finally switches off the engine.

So that the motor is safely down to "zero" after each start-up attempt expires, the first pulses arriving from the trigger circuit (2) are in the counting circuit (8) is suppressed, since it is still being driven in the run-down phase of the motor of the inner magnet part can take place, but its pulses at this point in time are undesirable.

Parallel to the pulse processing is still after the trigger circuit (2) A monostable folding circuit (9) is connected, which has an analogue speed display enables.

L e r s e i t e

Claims (3)

Claims 1.) Device for automatic restarting a synchronous permanent magnetic clutch driven by an electric motor, which has fallen out of step For pressure-resistant rotary clocks with driving external magnet part, driven internal magnet part and a pressure-resistant housing between the two, characterized in that the at revolving internal magnet in the shtionary magnet-dependent resistance (1) Resistance change via an amplifier and a subsequent trigger circuit (2) is converted into digital pulses, which over the monostable multivibrator (3) pass a control pulse to the NAND gate unit (4), which occurs when the unit is at a standstill of the inner magnet part the path of the pulses of the astable flip-flop (5) through the NAND gate unit (4) enables and thereby the motor relay (6) periodically and hold out and try on a certain number of unsuccessful start-ups The NAND gate unit (4) blocks the pulse counter (7) and thus the motor turns off. 2.) Device according to claim 1, characterized in that between Trigger circuit (2) and monostable multivibrator (3) a counter circuit (8) is inserted, which suppresses the first pulses. 3.) Vorrtchtung according to claim 1 or 2, characterized in that parallel to the automatic pulse processing behind the trigger circuit (2) Monostable multivibrator (9) is connected, which converts the pulses into an analog Converts speed measurement signal.