Let us now look into the construction and working of three point starter to . The 4 point starter like in the case of a 3 point starter also acts as a protective device. 3 4 Point Starter - Download as PDF File .pdf), Text File .txt) or read online. DC motor. 3 Point or 4 Point Starter - Download as Word Doc .doc), PDF File .pdf), Text File .txt) or read online.
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There are different types of manual starters available for DC motor namely 2 point starter, 3 point starter, and 4 point starter. A DC motor starter includes external resistance, no-volt release coil, and overload release coil. This article discusses the construction and working. A 4 point starter protects the armature of a DC shunt motor or compound wound DC motor against the initially high starting current of the DC. PDF | Direct Current Motors have been used since the early 20 th century shows the schematic diagram of a 4 Point Starter of a DC Motor.
Under running condition. The starter consists two protective devices, i. Populer di Health. Thus the working of the 3. What is the main disadvantage of 4-point starter?
But we can say the main difference between a 3-point starter and a 4-point starter is the manner in which no-volt release coil is connected. And thus it does not protect the motor from field failure conditions which result into the high speeding of the motor. Meerut U. This is called high speeding action of the motor. With respect to the figure.
Now we are going to discuss about the constructional details of this 4 point starter. Thus field winding gets supply through the parallel path provided to starting resistance with the help of NVC.
So it will always maintain the handle in the run position. The basic difference between three point and four pint starter is the connection of NVC. Total supply current is not passing through the field winding because a parallel resistance connected across the field winding.
With the help of 3-coil starter D. Terminals a1a2 will become short circuit across the NVC coil. OCC open circuit coil connected across the field winding of the motor. Due to this high current OLC coil energies.
Armature terminals A1A2. So that motor not runs very high speed in the case of open field winding.
If the short circuit occurs across the field winding then very high current flow through the field winding. If this theory successful then we can solve a very big drawback of 4-point starter. It modify the draw back of 4. But this resistance having a very high value.
Terminal f1 is connected to NVC no voltage coil. Thus field winding gets energies by passing the current. Thus the working of the 3. Fifth edition. Coil starter remove this drawback of 4.
Coil starter remove the problem of 3.
When field winding will open circuit the total supply current pass through the OCC coil. Field winding terminals F1F2. Terminal a1a2 will become short circuit when OLC coil operated. R4 extra resistance connected in series with armature in staring of D. Field winding connected in parallel across the OCC coil. These explain as: Drawback in 4. Second edition. So that OCC coil will energies.. I finalize that with the help of 3.
A1 is connected to the last resistance terminals. I will try to that it will practically possible or not in lab. Seventh edition. Working of 3-coil starterAs we provide the D. It has three coils.
Due to energies OCC terminal a1a2 short circuit. So that no current flow through the NVC coil. Flag for inappropriate content.
Jump to Page. Search inside document. This back emf of dc motor is given by and has a major role to play in case of the starting of dc motor.
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