DE361515C

DE361515C - Device intended for the electrical remote transmission of rotary movements

Info

Publication number: DE361515C
Application number: DEG43757D
Authority: DE
Original assignee: Individual
Current assignee: Individual
Publication date: 1922-10-16

Description

Die Erfindung bezieht sich auf Vorrichtungen zur elektrischen Fernübertragung von Drehbewegungen, d. h. also auf Vorrichtungen, bei denen ein mit einer Ablesevorrichtung versehener Geber vorhanden ist, welcher mit einem Empfänger elektrisch verbunden ist und in diesem ein Drehfeld zu erzeugen vermag, das seinerseits die Drehung eines Läufers verursacht. Bei denThe invention relates to devices for remote electrical transmission of rotary movements, d. H. So on devices in which one with a reading device provided encoder is present, which is electrically connected to a receiver and in this a rotating field able to produce, which in turn causes the rotation of a rotor. Both

ίο Vorrichtungen dieser Art entspricht der Winkel, um den der Läufer gedreht wird, nicht genau dem Winkel, um den die Antriebswelle des Gebers gedreht wird. Denn um die Drehung des Läufers herbeizuführen, muß das im Empfänger erzeugte Drehfeld gegenüber dem Läufer erst eine solche Lage eingenommen haben, daß das 'durch das Feld auf den Läufer ausgeübte Drehmoment groß genug ist, um die Trägheit des Läufers und die Zapfenreibung zu überwinden. Es muß also die Antriebswelle des Gebers erst um einen !bestimmten Winkel gedreht werden, ehe die Drehung des Läufers beginnt. Die Erfindung -bezweckt nun, die Vorrichtung in einfachster Weise so auszubilden, daß die Ablesevorrichtung des Gebers trotzdem den genauen Winkel oder ein Vielfaches von dem Winkel anzeigt, um den sich der Läufer des Empfängers dreht.ίο Devices of this type corresponds to Angle by which the rotor is rotated, not exactly the angle by which the drive shaft of the encoder is rotated. Because in order to bring about the rotation of the rotor, the rotating field generated in the receiver must have only taken up such a position in relation to the runner that the 'through the field The torque exerted on the rotor is large enough to reduce the inertia of the rotor and to overcome the journal friction. So the drive shaft of the encoder has to be changed first must be turned a certain angle before the rotor begins to turn. the The invention now aims to design the device in the simplest possible way so that the The encoder's reading device still shows the exact angle or a multiple of that Indicates the angle through which the rotor of the receiver rotates.

Auf der Zeichnung ist ein Ausführungs-. beispiel des Erfindungsgegenstandes veranschaulicht, und zwar zeigtOn the drawing is an execution. example of the subject matter of the invention illustrates, namely shows

Abb. ι in schematischer Weise die Gesamtanordnung der Vorrichtung undFig. Ι in a schematic way the overall arrangement the device and

Abb. 2 eine Einzelheit des Gebers.Fig. 2 a detail of the encoder.

An der Geberstelle ist ein auf einer Welle A starr befestigter, aus nicht leitendem Stoffe bestehender Zylinder B drehbar gelagert. Auf dem Zylinder B sind in der aus Abb. 1 ersichtlichen Weise zwei mit dem positiven bzw. negativen Pole einer (nicht dargestellten) Elektrizitätsquelle verbundene lange Metallstreifen &¹ und b^z und zwei Paare kürzerer Metallstreifen b^s und V' kollektorartig eingelegt. Von den letzteren steht das Paar b^z über einen Widerstand Ψ mit dem langen Metallstreifen V^s- und das Paar &⁴ über einen Widerstand b^e mit dem langen Metallstreifen b² in elektrischer Verbindung. An dem Zylinder B liegen drei um je 120° gegeneinander versetzte Bürsten C an, die bei einer Drehung des Zylinders auf den Metallstreifen b¹ bis fc* schleifen. Die > Bürsten C stehen durch Leitungen D mit drei ebenfalls um je 120⁰ "versetzten Punkten der Wicklung e¹ des Ständers B des Empfängers in elektrischer Verbindung, so daß in dem Ständer B ein magnetisches Feld von bestimmter Richtung entsteht, 'das bei einer Drehung des Zylinders B umläuft. Der Läufer des Empfängers ist als einfacher Magnet F dargestellt, der drehbar gelagert ist. Die Längsachse des Magneten F fällt im Ruhezustände der Vorrichtung mit der Richtung des Feldes des Ständers E zusammen. Da sich bei der Drehung des Zylinders S das magnetische Feld des Ständers B des Empfängers in Übereinstimmung hiermit dreht, so ülbt 'das Feld auf den Magneten F ein Drehmoment aus, das diesen in Drehung zu setzen sucht.. Der Drehung dieses Feldes folgt aber der Magnet F infolge seiner Trägheit und der Zapfenreibung nicht sofort, sondern erst, wenn das Feld sich um einen bestimmten Winkel α gedreht hat und auf den Magneten F ein Drehmoment von solcher Stärke ausübt, daß es die Trägheit des Magneten F und die Zapfenreibung zu überwinden vermag. Mit Rücksicht auf diesen Umstand ist nun am Geber folgende Einrichtung· getroffen: A cylinder B, which is rigidly attached to a shaft A and made of non-conductive materials, is rotatably mounted at the encoder point. On the cylinder B ^{, two long metal strips & 1} and b ^z and two pairs of shorter metal strips b ^s and V 'connected to the positive and negative poles of an electricity source (not shown) and two pairs of shorter metal strips b s and V' are inserted in the manner of a collector in the manner shown in FIG. Of the latter, the pair b ^{z is} in electrical connection via a resistor Ψ to the long metal strip V ^s - and the pair & ⁴ via a resistor b ^e to the long metal strip b ^2. On the cylinder B there are three brushes C which are offset from one another by 120 ° and which, when the cylinder is rotated, rub against the metal strips b ¹ to fc *. The> brushes C are electrically connected by lines D with three points of the winding e ^{1 of} the stator B of the receiver, also offset by 120 ⁰ ", so that a magnetic field of a certain direction arises in the stator B, which occurs when it rotates of the cylinder B. The rotor of the receiver is shown as a simple magnet F , which is rotatably mounted. The longitudinal axis of the magnet F coincides with the direction of the field of the stator E when the device is at rest If the magnetic field of the stator B of the receiver rotates in accordance with this, the field exerts a torque on the magnet F which tries to set it in rotation. The rotation of this field, however, is not followed by the magnet F due to its inertia and the pin friction immediately, but only when the field has rotated through a certain angle α and exerts a torque on the magnet F of such strength that it reduces the inertia d it is able to overcome magnet F and the pin friction. With this in mind, the following device has now been set up on the encoder:

An der Wellet des Gebers befindet sich ein Ansatz a¹, der durch zwei Federn G und G¹ in der aus Abb. 2 ersichtlichen· WeiseOn the shaft of the encoder there is an attachment a ¹ , which is supported by two springs G and G ¹ in the manner shown in FIG

Claims

is in connection with a washer H which can be loosely pivoted on the shaft. The disk H is provided with an angular graduation h1 and, together with a mark k1 provided on a stationary part K, forms the reading device of the encoder. The springs G and G1 endeavor to keep the shaft A in the central position shown in Fig. 2 with respect to the disk H. ίο They are dimensioned so that when the shaft A is rotated out of its central position with the disk H stationary and then left to its own devices, they are able to turn the shaft A back into its central position. In order to prevent the disk H from also rotating when the shaft A begins to rotate under the action of the springs G and G1, a spring / is attached to the stationary part K of the encoder, which is applied to the disk H with a certain tension . The tension is dimensioned such that the resistance which the friction produced between it and the spring / during a rotation of the disk H opposes a rotation of the disk H is greater than that caused by the springs G and G1 when the shaft A rotates torque exerted by the disk H. At the disk H there are 'two approaches h? tmd hs provided, which lie on both sides of the approach α1 of the shaft A with a certain amount of play. The play is dimensioned so that the shaft A must first rotate through the above-mentioned angle α in one sense as well as in the other, before the attachment a1 comes to abut the attachment.h "or hs. If the shaft A rotated out of its central position in one sense or another, the disk H initially remains at rest as a result of the pressure exerted on it by the spring / So the shaft A is rotated by the angle α, .Will a forced connection between the shaft A and the disk H in the direction of rotation of the shaft A, and this takes part in the rotation of the shaft A. At this moment, however, the Direction of the field generated in the stator E is rotated by the angle α with respect to the longitudinal axis of the magnet F, which remains at rest due to the inertia and the bearing friction, and it is accordingly also the torque which 'the rotating field generated in the stator E on de n magnet F has become so large that magnet F is also set in rotation and now rotates in complete correspondence with shaft A and thus with disk H. If the rotation of the shaft A is interrupted, the rotation of the magnet F also stops, and the disk H at the reading mark k% shows exactly the angle through which the magnet F has rotated. If the shaft A 65 is now left to its own devices, the springs G and G1 rotate it back into its central position opposite the Scheiheii, while the disk H remains at rest as a result of the action of the spring /. When the shaft A 70 is turned back, the magnetic field of the stator E1 also turns back and this coincides again with the direction of the longitudinal axis of the magnet F when the shaft has reached its central position. 75 The conditions are then exactly the same as / at the beginning of the rotation of shaft A, so that when a new rotation of shaft A is initiated, the same processes take place again as described above. The reading device h1, k1 always displays the exact angle through which the magnet F has rotated. P A T E N T - Al ·! SAYINGS:

1. For electrical remote transmission of rotary movements certain device, characterized in that between the shaft (A) and the rotatable part (H) of the reading device (H, h ¹ , k ¹ ) of the encoder has a coupling (a ^l , hr, h ^s ) is turned on, which in the sense of rotation of the shaft (A) inevitable connection between the shaft (A) and the mentioned parts (H) of the reading device (H, h ¹ , ¥ ■) only produces after the shaft (A) by one (rotated a certain angle out of its starting position. loo

2. Apparatus according to claim 1, characterized in that the shaft (A) is under the action of an energy storage device (G, G ¹ ) which after the production of the in the direction of rotation of the shaft (A) inevitable connection between the shaft (A) and the rotatable parts (H) of the reading device (H, h ¹ , k ¹ ) when the shaft (A) is released

is able to turn back the same angle with respect to the rotatable part (H) by which it must be rotated out of its initial position in order to produce the above-mentioned positive connection.

1 sheet of drawings.