DE1613616C - Starting device for a single-phase asynchronous motor - Google Patents

Description

1 sheet of drawings

Claims (1)

1 ² • The invention relates to a starting device - a constant resistance and a variable for a single-phase asynchronous motor with a resistor, it is possible to meet the three mentioned conditions Occasional winding and a running winding in which the gene is to be met. The PTC resistor is alone only Starting winding with a parallel connection of a request is responsible for the final value. The initial value drive capacitor and a PTC resistor 5 is determined by the sum of the cold resistance of the arrangement in series. PTC resistor and the fixed ohmic resistance Formed in a known starting device of this type stand. The division of the two contradicts itself the starting winding with two parallel circuits can be done without difficulty so that the of one operating capacitor and one PTC power dissipation converted in the PTC resistor Resistance in series. When running up, io takes on the required thermal delay the PTC resistor results in part of the losses in size. For such a device are also lasszweig, heats up and thus receives such a PTC resistor made of ceramic material high resistance value that can be used after startup. essentially only the capacitor is effective. An embodiment of the invention is shown in FIG is. This gives a motor that illustrates a drawing as a circuit diagram. Has resistance start-up, but with an operating capacitor. A single-phase asynchronous motor 1 has a is working. Run winding 2 and an event winding 3. He can In practice, however, it is not possible to design a network with terminals 4 and 5 via a circuit. Because the initial value of the main switch 6 is fed. The starting device PTC resistor must be dimensioned so that a 20 device consists of a capacitor 7 in parallel sufficient phase shift for the run-up circuit with an ohmic resistor 8 and is present and the final value must be dimensioned a PTC resistor 9. This parallel connection that the branch with the PTC resistor is in series with the starting winding 3,
table is de-energized. Taking this into account, as an example, it should be stated that for a motor the resistance value of the PTC resistor 25 with an output of ¹ Ao PS for a 220 V network, the current flowing through such a heating with a capacitor? a capacity of 1.5 μΈ, which results in a thermal delay resistor 8 having a value of 50 ohms, the PTC when running through the resistance characteristic curve, the resistor 9 a cold value of 20 ohms and on the one hand a safe run-up allowed, on the other hand, warm resistance in the order of magnitude of the current but limited in time that the 30 10 ⁴ ohms and the starting winding 3 does not respond to a resistance motor protection switch. has a stand value of 30 ohms. It is also known, with the starter winding two When inserting the switch 6 flows in the starter branch parallel branches to be connected in series, one of which is a current that is generated during the starting process of one has an operating capacitor and the other has a fairly large value with predominantly effective Series connection of a starting capacitor and a 35 component to a smaller value with predominantly Has PTC resistor. The PTC- gender reactive component acts here.
Resistance essentially as a time switch that after a predetermined time the starting capacitor un- Patent claim:
makes effective. The invention is based on the object of a 40 starting device for a single-phase asyn- Starting device of the type described at the outset, an chronograph motor with a starting winding and a admit that in a simple way for practice running winding, in which the starting winding with can be made useful. a parallel connection of an operating condenser According to the invention, this object is achieved by the generator and a PTC resistor arrangement in FIG solves that the PTC resistor arrangement is from a 45 row, characterized in that, Series connection of a PTC resistor and one that the PTC resistor arrangement from one fixed ohmic resistance. Series connection of a PTC resistor and By dividing the ohmic branch into a fixed ohmic resistance.