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Why do some motors need capacitors?

There are three reasons:

1: Single-phase motors are not inherently self-starting. The magnetic field produced in the stator alternates, but does not rotate. In order to get the rotor turning, a second, phase-shifted magnetic field is necessary. There is then a start winding designed into the motor that uses a capacitor to phase-shift the current flowing through it, and that produces the necessary rotation of the field that provides starting torque. Once the motor reaches sufficient speed, a switch opens the start winding circuit (capacitor start), or the motor is designed to operate with the second winding constantly on (capacitor run).



On small three-phase motors, capacitors are often used in phase converters to take a single-phase input and produce a reasonable facsimile of a three phase output to the motor. These are limited in application as the motor really cannot be run at full load, and starting torque is diminished:



On larger three-phase motors, capacitors are used to improve the power factor of the motor. See:

Can I connect 12V 100Ah and 12V 200Ah batteries in parallel for a 12V system?

People who don’t know about this topic are making totally incorrect recommendations. Yes, you certainly can, with no problem assuming you are talking about 2 batteries of the same type, i.e, lead-acid. As a percentage of their capacities, they will both charge and discharge at the same rate, though the current into and out of the 200Ah battery will always be about double that of the other. You cannot connect them in series at all, but you certainly can parallel them. I am an engineer at a company that builds military-grade uninterruptible power supplies. My current task is the design of a 24-channel battery pack charger for our battery packs. I know a thing or two about batteries. This is absolutely the correct response and one you can bet your life on. End result is a 300Ah battery.

Do make sure to fully top-charge both independently before connecting together to avoid a huge spark. Then make connection of new battery to system through a low-value high-wattage resistance, something like 10 ohms, 10W. An incandescent light bulb will do as the resistor. Then once both batteries are at the same voltage/no voltage across the resistor, remove it and direct connect.

EDIT: For those who disagree with my answer, let me draw a parallel that is a near-perfect model. You have 2 large elevated rectangular water tanks which are at the same height and have equal height, but one’s cross-section is 1m x 1m while the other is 1m x 2m. Both are open at the top to the atmosphere. Directly under their bottoms is a pipe T-fitting connection connecting them, then a single pipe down to a valve and a load, let’s say a water turbine. The water pressure at the turbine is equivalent to the voltage of two subject batteries, the water in them is equivalent to the amp-hour capacity of each, and any flow of water out the bottom is equivalent to current going to a load. Now open the valve and let the turbine run. If

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