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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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11-11-2018, 03:18 PM | #21 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Max rpm’s admiral motor?
Quote:
The brush type DC electric motors we use consists to two sets of electromagnets. One set is stationary, called stator or field, and a moveable set called the armature. What determines if it is a torque motor or a speed motor or something in between those two extremes, is the relative strength of the two sets of electromagnets. Make the stator strong relative to the armature and it is a torque motor and make it weak relative to the armature and it is a speed motor. The magnetic strength of each electromagnet is determined by the how many turns of wire is wrapped around the magnet core, the more turns of wire, the stronger the electromagnet. The number of amps flowing through the wire also determines the strength on the magnet. With a series motor, the same amps flowing through the armature flows through the stator, so the relative magnet strength based on amp flow remains the same regardless of the number of amps flowing through the motor. That means the relative magnetic strength of the moving and stationary sets of electromagnets is determined by the number turns of wire used to make them at the factory and the only way to change that ration is to physically add or remove the number of turns of wire in either the movable or the stationary electromagnets. Apparently EMP winds the motor for more torque and adds a tap to the stationary sets, so when the tap is selected, the stationary electromagnet sets are weaker, leaning the motor's performance curve towards more speed. On the other hand, the movable and stationary electromagnet set in a Sepex motor are separately excited and the amp flow isn't the same. The stationary electromagnet sets are made up from a lot of turns of wire, so not as many amps are needed to create magnet strengths similar to those found in series motors. By altering the amp flow in the stationary electromagnet sets, the performance of a sepex motor can be shifted from higher torque to higher speed during operation. It is called field mapping. As I see it, the stator (field) electromagnet sets are not tapped in sepex motors due to a couple reasons. First and foremost, no need to do so since it is already being done electrically. (Field mapping) Secondly, I don't know of any controller out there that can switch between two different field maps. |
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11-13-2018, 12:58 PM | #22 | |
EZ come EZ go
Join Date: Apr 2012
Location: Parkland FL
Posts: 1,412
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Re: Max rpm’s admiral motor?
Quote:
I've got a rebuilder working on my toasted motor now, he thinks he can repair. but from what Chuck said - I may go that route anyway.. dude knows his poo poo |
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11-13-2018, 01:03 PM | #23 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,419
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Re: Max rpm’s admiral motor?
We told you so
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11-13-2018, 02:27 PM | #24 |
Getting Wild
Join Date: May 2017
Posts: 85
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Re: Max rpm’s admiral motor?
So my previous questioning on upgrading a series motor (upgraded cart from 36v to 48v) got a lot of votes for Plum Quick -- is EMP a better choice?
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11-13-2018, 02:30 PM | #25 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,419
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Re: Max rpm’s admiral motor?
It depends upon what you want and what you want to spend. PQ, Admiral, FSIP, D&D all offer off the shelf upgrade motors. EMP offers custom solutions at a higher cost.
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11-13-2018, 03:15 PM | #26 | |
Getting Wild
Join Date: May 2017
Posts: 85
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Re: Max rpm’s admiral motor?
Quote:
If we get over $1000...... |
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11-13-2018, 05:32 PM | #27 |
Gone Wild
Join Date: Sep 2016
Location: Northern California
Posts: 1,300
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Re: Max rpm’s admiral motor?
Chuck wrote up three different options for me. All three very detailed. I’ve got a 58v lithium pack on a street cart. I knew the speed would be there, and didn’t have big torque concerns, so went with what we thought would be the most robust. All three motors would have ended up within $50 of each other by the time options were added. My invoice was $675. That included a $200 core charge, which I got back $110 of. I’m in California, so shipping motors each direction added up a bit. The $675 also included $50 for the high speed banding and the same for the over temp switch.
I’m sure I could have gotten a great motor at one of the other places, but Chuck was the one that took the time to try and get me exactly what I needed. Hope this helps. |
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