Motor Meatloaf – Week 2

Welcome back all you Chef Boyardees you!  This week we meander to the other side of the kitchen to talk about Capacitor Start, Split Phase, and Three Phase motors.

First, Capacitor Start.  A Capacitor Start motor has a higher starting torque than Split Phase motors because it has a capacitor in series with the start winding.  The capacitor is usually visible and mounted on the motor frame.  Capacitor Start motors are typically used in hard-start applications such as compressors and pumps.

Second, Split Phase motors.  Split Phase motors are typically used for belt drive furnace blowers and belt drive ventilators.  They have a higher starting torque than PSC motors, but not as high as Capacitor Start motors.  They are usually at defined rpm ratings such as 3450, 1725 or 1140.  They are not constructed to provide the wide range of multi speeds as seen in shaded-pole or PSC motors.

Third, Three Phase motors.  Three Phase motors are the most efficient general purpose motors.  They are used in industrial or large commercial applications where three phase power is available.

Next week we will delve into the ingredients of motors and what to look for when matching a motor!  Until then, bon appetit!

Motor Meatloaf – Week 1

Welcome to the kitchen, folks! Let’s start with a basic menu of motor types and see what we want to make today! The most commonly used air-moving motors are Shaded-Pole and Permanent-Split Capacitor types. Shaded Pole, or SP, motors are used where low cost and low starting torque are required. They are used to drive blowers, bathroom vents, range hoods, attic vents, fan coils, etc. An SP motor can be recognized by the individual stator coil windings and the single copper band formed around one side of each stator pole. You can see this by looking inside the motor or taking off an end bell. SP motors always rotate toward the shading (copper) band. Permanent-Split, or PSC, motors are used where higher starting torques are needed than what an SP motor will provide. They are also used where you need a higher efficiency. In general, PSC motors are twice as efficient as an SP motor. They are used for higher efficient blowers, condensers, or where you may need a higher horsepower. A PSC motor can be recognized by the capacitor that will be attached to it, or by the tight, double, windings in the motor. PSC motors are also generally reversible and can be wired for either rotation. Next week we will get back to the kitchen and drum up a recipe for Capacitor Start, Split Phase and Three Phase motors. Bon appetite!

Motor MeatLoaf

Like your Mom’s meat loaf, where you’re not exactly sure what is actually in it (!), many folks don’t know what is inside, what makes it up, or what are the important specs of an electric motor.  Motor MeatLoaf is going to help you with all your motor ingredients!  Wells Tech will be posting a weekly recipe to help guide you in the kitchen…or attic, or basement, or rooftop, or where ever you have a motor replacement need!   So….keep an eye out for the first addition of our menu of motor mechanics shortly!