The imPower motor by Marathon Electric
The imPower motor is a low cost solution for people who want a multi - speed permanent magnet motor without replacing entire pump.
1)Comes in square flange and C-frame styles
2)230 VAC only
3)Up to 1.25 HP load - equates to 3/4 HP full rated motor or 1 HP uprated motor....is NOT the same as the 3 HP multi speed pump shown on bottom of page!
4)May not apply for utility rebates.
5)If your pump is still in good shape and you do not need more HP,this motor,although more expensive than a regular motor,is probably a good choice.(I personally have not installed any yet)
Shown below are the Green motors by A.O. Smith (now Century) the one on left is multi-speed,the one on right two speed...these motors have controllers included that allow motor to start on high to prime then go to lower speed...from 3/4 to 2.7 H.P.
A.O.Smith motor style
Centurion pool pump motor style
Both of the above pool pump motors are made by A.O.Smith, but I labeled one Centurion pump motor because this style of motor was originally made by Century Magnatek Corporation. The difference in appearance is the Centurion Style Motor is fat and short, with the capacitor on the top, while the A.O.Smith Motor is long and skinny. Also,there are similar motors to the Centurion style such as Emerson which I like...I like the Centurion motor style better because:
1)It has a switch-less capacitor start (less moving parts)
2)Its shorter and will fit into tight spaces(like next to a wall or fence)where an A.O.Smith Motor may have problems
3)Its easier to service the capacitor and/or hold the shaft to change the seal on this type of motor shown below. The centurion style is shown on the left with wrench holding the shaft. The A.O.Smith style is on the right - in order to get to the shaft,a wrench must be slid under the mechanical switch/centrifugal shut off switch. More often than not, something is broken in the process! Also,it is very hard to use a wrench to free a stuck shaft on the motor shown to the right....of course,there is a wrench available (by A.O Smith) that slides easily onto the shaft without removing any motor parts...your pool man can get you one for free if he attends a pool show,but even with this wrench you cannot readily spin the shaft to free a stuck motor.
Not all horsepower ratings on pool pump motors are equal due to service factors....more on this subject on the "choosing the right pump" page link below:
Another thing to consider is cast iron endcaps. Most motors come with aluminum endcaps which is a softer metal than iron. A softer motor endcap can lead to a motor bearing OSCILLATING around inside the end-cap. These end-caps are known as ENDBELLS. But not all motors are available with cast iron end-caps..ask your swimming pool service tech about upgrading to a cast iron endbell next time it is time to change the motor.
Sometimes a motor is labeled "high efficiency" which means it uses about 20% less electricity than a standard motor. I have been told this is due to the windings having a higher copper content on efficient motors.
If you have owned a home with a pool for many years
you may think "Pool motors don't last as long as they did in
the good ole days!"....Its possible you are senile, but
manufacturers, in a bid to improve motor efficiency, have reduced
the size and weight of the cooling fan to take less power
away from the motor which means the motor runs hotter
especially in areas like Southern California or Arizona in the
summer. One way to compensate for this is to run the pump
during evening or early morning hours but the noise may make
this undesirable...which is another reason to get a two speed
(or multi speed) pump which you can barely hear on low speed.
A multi speed motor with attached digital keypad
The motor above is a rare earth magnet motor(instead of copper windings) with a large cooling fan at the rear and can run from 1 to 3400 RPM's. I have been told this motor is built to 6 HP specifications even though the pump is rated at 3 HP....This pump runs cool, is sealed against the elements, and saves electricity. But it is also very expensive compared to a standard motor. There is more information on these motors in the Two Speed/Multi Speed Swimming Pool Pump section below: