Choosing filter capacitors [DC motor controller]

[XaviPacheco]

Hi,

I'm designing a DC motor controller for treadmill. As stated in one of my previous posts, the motor is a PMDC with the following nameplate:
LEESON Direct Current Permanent Magnet Motor
MODEL: C4D48DB1A
VOLTS: 125
RPM: 5000
AMPS: 27
H.P.: 4.0
DUTY: CONT

As it's for treadmill, the max power is rarely reached. I will rectify mains and use PWM technique with a power mosfet.
Someone once suggested me not to use capacitors and just use the unfiltered voltage. But at the end of the day, I will get away with use them. I have seen many treadmills DC motor controllers, and some models use only one capacitor 1500uF @200V and other models use two 1500uF @200V capacitors in parallel.

Well, doing de calculations with the formula Ic = Cdv/dt, using those capacitors value allow certain amount of ripple.

Basically my question is:
As I have decided to go with filtering the mains, what do you suggest? Using one capacitor (which saves space and cost) or two capacitors in parallel. Let's say the calculations throw a value around 3000 uF, why not to use one 3300 uF capacitor instead of two 1500uF? Is there any advantage on paralleling two capacitors with the same characteristics?

[timpattinson]

ESR/ESL?
Also can be easier to package two smaller cylinders vs. one big one.

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