Sunday, Jan 23, 2011 at 00:06
Hi Ken
I will not go into the pros & cons of different as my only experience is with Honda
What I will do is give you an outline of the two Types:
Using your term armature type
[not technically correct but we both understand what you mean]
[1]These generally, simply by design,produce a very good sine wave output
[2] the frequency is directly proportional to the speed Ie engine slows down ,frequency drops same % with no means of correcting
[3]Voltage is also speed dependent but can be adjusted within limits with an automatic voltage control [AVR]
[4]Ability to cope with sudden heavy load changes & maintain constant speed is very dependent on the engine power & governor response time.
The major problem with these types is ability to meet reqs of[4]
with inductive loads[motors, microwaves etc the ]frequency drops due to speed changes the current rises dramatically,further loading the engine possibly to the extent that the engine may stall
Basically the engine needs to powerful enough &
the governor needs to respond quick enough for speed to remain relatively constant
With the inverter type :
[1]wave form depends heavily on design with pure sine wave being much more complex
[2]Frequency is not speed dependent as it can be controlled,within limits electronically.This again depend on design & quality
[3]voltage also can be controlled within limits,but just how good again depends on design & reliability
[4]ability to cope with sudden heavy load changes is much less a problem AS maintaining the frequency can allow the engine time to recover[again within
limits
This means that motors ,air cons,etc starting can be done with a smaller engine.
For heating ,lighting etc [resistive loads]there is not much to gain with an inverter type
however even the inverter type with eco throttle setting[such as Honda can /do have problems with sudden heavy load increases if running on eco setting
This probably has not helped you much but perhaps you understand the pros & cons
Peter
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