Question

What is the difference between capacitor start and capacitor run motor?

Answer 1

Before attempting questions like the one mentioned above, keep in mind the various concepts regarding motor, all the terms related to motor like capacitor, power start et cetera. Keep in mind all the various factors related to the motor and how they affect the motor’s performance and efficiency.

Complete step by step answer:
A motor is a handy mechanism which is used to convert electrical energy into mechanical energy. There are different parts that make up the electric motor, and every part has a different function. The parts consist of a power supply – which is mostly DC for a simple motor, then we have a field magnet which can be a permanent or electromagnet, then we get an armature or rotor, a commutator, brushes and lastly an axle.
Then we have the Alternating current motor or AC motor. In a DC motor, the armature rotates while the magnetic field remains stationary, in contrast to an AC motor where the armature is stationary and the magnetic field rotates.
AC motors usually use about two or more coils to help generate a rotating magnetic field which subsequently produces torque on the rotor. The reason why two coils are used instead of one is because although a single coil can generate a magnetic field, it won’t be enough to sufficiently start the motor from a standstill.
AC motors consist of a motor capacitor which can be a start or run capacitor which helps to alter the current to one or more windings of a single phase AC motor to create a rotating magnetic field.
Basically the difference between capacitor start and capacitor run motor is that firstly the capacitance of the start capacitor is more than run capacitor. Secondly the start capacitor as the name suggests is found in the start windings of the motor, while run capacitor is used to maintain the charge and provide power to the motor. While the start capacitor provides an initial electrical push to the motor helping it to start, the run capacitor helps in maintaining that start and charge.
Note:
Working principle of an electric or DC motor is that a current carrying conductor will produce a magnetic field around it. There are different types of varieties of motors out in the market. Under DC motors we have brushed and brushless motors which are further classified, and in AC motors we have synchronous and induction motors which can also be further classified.