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Author Topic: Generator suggestions  (Read 3527 times)

Frank Koenig

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Re: Generator suggestions
« Reply #10 on: June 10, 2019, 02:21:51 pm »

A synchronous generator provides one output cycle per pole-pair per revolution. So for 60 Hz output a 2 pole machine would need to turn 3600 RPM, a 4 pole machine 1800 RPM, a 6 pole machine 1200 RPM, and so forth.

The same relationship roughly holds for conventional induction motors. The difference is that they are not synchronous but run at a "slip speed" so that the output speed is always somewhat less than the synchronous speed (as determined from the input frequency and the number of poles), and depends on the load torque.

In the modern world with cheap and amazing power electronics all this matters a lot less. A great thing for windmills, small engine-driven generators, electric vehicles, and variable speed drives of all sorts.

--Frank
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"Nature abhors a vacuum tube." -- John Pierce, Bell Labs

Steven Cohen

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Re: Generator suggestions
« Reply #11 on: June 10, 2019, 02:31:31 pm »

Frank,

Your statement of
"In the modern world with cheap and amazing power electronics all this matters a lot less" reminds me of a few weeks ago when I carried down an Itech 4 X 3500hd under one of my arms from a catwalk. I still had my other arm free to hold on to the stair rail.

 
A synchronous generator provides one output cycle per pole-pair per revolution. So for 60 Hz output a 2 pole machine would need to turn 3600 RPM, a 4 pole machine 1800 RPM, a 6 pole machine 1200 RPM, and so forth.

The same relationship roughly holds for conventional induction motors. The difference is that they are not synchronous but run at a "slip speed" so that the output speed is always somewhat less than the synchronous speed (as determined from the input frequency and the number of poles), and depends on the load torque.

In the modern world with cheap and amazing power electronics all this matters a lot less. A great thing for windmills, small engine-driven generators, electric vehicles, and variable speed drives of all sorts.

--Frank
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Rob Spence

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Re: Generator suggestions
« Reply #12 on: June 10, 2019, 03:45:18 pm »

To the OP, why do you want an inverter unit?
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rob at lynxaudioservices dot com

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Dave Guilford

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Re: Generator suggestions
« Reply #13 on: June 10, 2019, 04:03:22 pm »

To the OP, why do you want an inverter unit?

Theyíre quieter. They came highly recommended. Iíve been using an inverter for 5 years already and always exceptionally happy with it.  Allows me to run pretty much anything Iíll ever need to with piece of mind.
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Rob Spence

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Re: Generator suggestions
« Reply #14 on: June 10, 2019, 05:24:06 pm »

Theyíre quieter. They came highly recommended. Iíve been using an inverter for 5 years already and always exceptionally happy with it.  Allows me to run pretty much anything Iíll ever need to with piece of mind.

MQ generators are also quiet. The better ones are so quiet you canít hear them 10í away.
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rob at lynxaudioservices dot com

Dealer for: AKG, Allen & Heath, Ashley, Astatic, Audix, Blue Microphones, CAD, Chauvet, Community, Countryman, Crown, DBX, Electro-Voice, FBT, Furman, Heil, Horizon, Intellistage, JBL, Lab Gruppen, Mid Atlantic, On Stage Stands, Pelican, Peterson Tuners, Presonus, ProCo, QSC, Radial, RCF, Sennheiser, Shure, SKB, Soundcraft, TC Electronics, Telex, Whirlwind and others

Scott Holtzman

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Re: Generator suggestions
« Reply #15 on: June 10, 2019, 07:49:42 pm »

MQ generators are also quiet. The better ones are so quiet you canít hear them 10í away.

Agree Rob.  We, like everyone rent a ton of the Honda's and they are great.  The MQ's are basically babies of their big boy units.  They are even more robust, quieter and I know it's a small point but you trailer that bad boy up and the client sees $150 value.  The Honda looks like what everyone else has.

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Scott AKA "Skyking" Holtzman
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Dave Guilford

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Re: Generator suggestions
« Reply #16 on: June 10, 2019, 08:36:20 pm »

Agree Rob.  We, like everyone rent a ton of the Honda's and they are great.  The MQ's are basically babies of their big boy units.  They are even more robust, quieter and I know it's a small point but you trailer that bad boy up and the client sees $150 value.  The Honda looks like what everyone else has.

$150?  Too cheap.  I get $400-500 on a generator when I rent it out!
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Dave Guilford

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Re: Generator suggestions
« Reply #17 on: June 10, 2019, 08:45:45 pm »

I know of MultiQuip of course.  And Wacker Neuson makes their G series.  Who else mfg similar ones?
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Scott Holtzman

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Re: Generator suggestions
« Reply #18 on: June 10, 2019, 10:49:40 pm »

$150?  Too cheap.  I get $400-500 on a generator when I rent it out!

You get $400 for a 7kva generator?  Geez I get a 70 delivered for $250

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Scott AKA "Skyking" Holtzman
River Delta Audio is now:

Ghost Audio Visual Solutions, LLC
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Dave Guilford

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Re: Generator suggestions
« Reply #19 on: June 12, 2019, 02:10:28 pm »

No. Local sunbelt / United Rentalís type places get me a 15 for $250 when I pick up and drop off.  I charge clients $400-500
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Re: Generator suggestions
¬ę Reply #19 on: June 12, 2019, 02:10:28 pm ¬Ľ


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