DE640151C - Device for controlling small electric motors with armature parallel resistance - Google Patents
Device for controlling small electric motors with armature parallel resistanceInfo
- Publication number
- DE640151C DE640151C DEK134298D DEK0134298D DE640151C DE 640151 C DE640151 C DE 640151C DE K134298 D DEK134298 D DE K134298D DE K0134298 D DEK0134298 D DE K0134298D DE 640151 C DE640151 C DE 640151C
- Authority
- DE
- Germany
- Prior art keywords
- electric motors
- parallel resistance
- small electric
- controlling small
- armature parallel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Multiple Motors (AREA)
Description
Zahnärztliche Maschinen, insbesondere Bohr- und ScUeifmaschinen, werden meist mit elektrischen Motoren betrieben. Diese arbeiten mit der für zahnärztliche Zwecke erforderliehen, im wesentlichen konstanten Umdrehungszahl von etwa 3000 in der Miaute.Dental machines, especially drilling and grinding machines, are mostly electric Motors operated. These work with what is required for dental purposes, essentially constant speed of about 3000 in the meow.
Für Schleif arbeiten werden jedoch wesentlich höhere Motordrehzahlen von etwa 7000 und darüber benötigt. Zur Ausführung derartiger Arbeiten hat man besonders schnell laufende Motoren gebaut. Diese Lösung ist aber unzweckmäßig, weil der Zahnarzt dann zwei besondere Maschinen benötigt.For grinding work, however, are essential higher engine speeds of around 7000 and above are required. To carry out such Work has built particularly fast running engines. This solution is but inexpedient because the dentist then needs two special machines.
Man hat weiterhin vorgeschlagen, zwischen Antriebsmotor und Werkzeug zur Erhöhung der minutlichen Umdrehungszahl Übersetzungsgetriebe einzubauen. Diese Getriebe sind kostspielig, verursachen meist störende Geräusche und eine unnötig starke Belastung des Motors.It has also been proposed to increase between the drive motor and the tool the minute number of revolutions to install transmission gear. These gears are expensive and usually cause disruptions Noise and an unnecessarily heavy load on the engine.
Es wurde nun gefunden, daß sich der Bau besonderer schnell laufender Motoren und mechanischer Übersetzungsgetriebe in sehr einfacher Weise dadurch ersparen läßt, wenn man erfindungsgemäß durch Abschalten des bei den bekannten Antriebsmotoren an sich bekannten und notwendigen Ankerparallelwiderstandes die normale Drehzahl des Motors von etwa 3000 ohne weiteres auf die zum Schleifen erforderliche Höhe von etwa 7000 bringen kann. Diese Lösung ist äußerst einfach, da die bekannten Elektromotoren lediglich mit einem einfachen Ein- und Ausschalter ausgerüstet zu werden brauchen.It has now been found that the construction of special high-speed engines and mechanical transmission gear can be saved in a very simple manner if one according to the invention by switching off the in the known drive motors per se known and necessary armature parallel resistance is the normal speed of the motor from about 3000 easily to the height of about 7000 required for grinding can bring. This solution is extremely simple, since the known electric motors only need to be equipped with a simple on / off switch.
In der Zeichnung ist das Schaltungsbild des mit der neuen Regeleinrichtung ausgestatteten Motors beispielsweise dargestellt.In the drawing is the circuit diagram of the one equipped with the new control device Motor shown for example.
ι ist der an sich bekannte, meist in vier oder fünf Stufen unterteilte Vorschaltwiderstand, 2 der Hauptein- und -ausschalter; 4 und s sind die Feldspulen, und 6 ist der bisher dauernd eingeschaltete Ankerparallelwiderstand, mit dem normalerweise etwa 3000 Umdrehungen in der Minute erreicht werden.ι is the known series resistor, usually divided into four or five stages, 2 the main on and off switch; 4 and s are the field coils, and 6 is the Up to now permanently switched on armature parallel resistance, with which normally about 3000 Revolutions per minute can be achieved.
Erfindungsgemäß ist nun für zahnärztliche Zwecke durch den Ein- und Ausschalter 7 der Ankerparallelwiderstand 6 abschaltbar gemacht. Durch Abschalten des Ankerparallelwiderstandes läßt sich zum Schleifen die minutliche Umdrehungszahl des Motors ohne weiteres auf die erforderliche Höhe von etwa 7000 Umdrehungen in der Minute und darüber bringen.According to the invention is now for dental purposes by the on and off switch 7 of Armature parallel resistor 6 made switchable. By switching off the armature parallel resistance the minute speed of the motor can be easily adjusted to the required level of approx Bring 7000 revolutions per minute and above.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK134298D DE640151C (en) | Device for controlling small electric motors with armature parallel resistance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK134298D DE640151C (en) | Device for controlling small electric motors with armature parallel resistance |
Publications (1)
Publication Number | Publication Date |
---|---|
DE640151C true DE640151C (en) | 1936-12-23 |
Family
ID=7248087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEK134298D Expired DE640151C (en) | Device for controlling small electric motors with armature parallel resistance |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE640151C (en) |
-
0
- DE DEK134298D patent/DE640151C/en not_active Expired
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