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Old 2007.04.18, 12:40 PM   #1
rharris
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How do you test your motor?

For anyone out there who knows how to do this, what equipment are you using? How do you get RPM and torque?

Our club would like to invest in some equipment to test motors. We'd like to know if our old motors are bad and if our new motors are good.

Thanks
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Old 2007.04.18, 04:14 PM   #2
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Hi,

I test my motors by running the 'break-in' mode of my LRP pulsar 2 comp charger. The break-in feature allows you to select the output voltage and the charger displays the amp draw by the motor. This works for a general check of performance. A good motor will draw more amps than a bad motor. Note that a bad motor can draw major amperage as well, but you'll hear the difference (if the motor won't spin at high RPM).

Alot of other guys use the drivetrain method, i.e. use the tamiya speed checker. It's like a little dyno for mini-cars...

I used to have some pro 1/10 motor gear (including a dyno), but the freewheel that attaches to the motors a) will not fit a mini-z motor b) software calculations would be incorrect. I always though a mini-z dyno would be cool.
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Old 2007.04.18, 04:51 PM   #3
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Thanks,

I've had my eye on the ICE charger for a long time. The motor break in would be cool.

I have a speed checker, but it doesn't seem all that accurate.

With all the guys into slot cars over the years, there has to be something out there.
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Old 2007.04.18, 05:20 PM   #4
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I was just thinking about what to use to test motors yesterday. With that nice heavy PN motor run-in stand, there ought to be a way to test motors with it. Power the motor you want to test. The voltage of the slave motor should be proportional to speed. Hook up a resistor to the slave motor. The current flowing thru the resistor should be proportional to the torque. Unless you calibrate it, you won't be able to get an absolute number, but you should be able to compare from motor to motor. Not sure if that is what you are thinking of, but there seems to be some possibilities there.
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Old 2007.04.18, 08:22 PM   #5
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I used to be heavy into slot cars, and I was surprised that nobody made a dyno for them. Someone did make a "dyno" for Tjets, but it was more of a speed checker and really only measured top speed.
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Old 2007.04.18, 09:06 PM   #6
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I usually just build a motor and try it out. If I like it, I keep it. If I dont like it, I build another.
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Old 2007.04.18, 11:01 PM   #7
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Quote:
Originally Posted by benmlee
I was just thinking about what to use to test motors yesterday. With that nice heavy PN motor run-in stand, there ought to be a way to test motors with it. Power the motor you want to test. The voltage of the slave motor should be proportional to speed. Hook up a resistor to the slave motor. The current flowing thru the resistor should be proportional to the torque. Unless you calibrate it, you won't be able to get an absolute number, but you should be able to compare from motor to motor. Not sure if that is what you are thinking of, but there seems to be some possibilities there.
Cool deal.

I have a PN stand. I may pick up a ICE charger to run the motor, that will tell me exactly what I'm pushing thru the slave motor. It would be very cool to set up some type of guage on (volt meter?) on the motor that I'm testing.

I bet Marvacs (on Harbor in New Port Beach) can help me out with the resistor.

Should be a fun project.
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Old 2007.04.18, 11:03 PM   #8
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Quote:
Originally Posted by Ninja
I usually just build a motor and try it out. If I like it, I keep it. If I dont like it, I build another.
LOL

That is my current method. Only I don't build them, I buy them. When the just don't feel rite anymore, I throw them out.

I'm looking for something a little more exact.
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Old 2007.04.18, 11:13 PM   #9
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This is what I want. But I think it would cost a ton to build it.

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Old 2007.04.18, 11:32 PM   #10
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you can build one with the following parts from tower hobbies
http://www2.************.com/cgi-bin...&I=LXMBS3&P=ML
http://www2.************.com/cgi-bin...?&I=LXNDU3&P=V
http://www2.************.com/cgi-bin...?&I=LXPBP2&P=V
http://www2.************.com/cgi-bin/wti0001p?&I=LXRAW8

total cost is around $130, but for any of you that think it may be worth it, I would love to see someone build one.

You would still require a battery, speed control, and reciever. If someone wants to send me proof that they bought everything on this list, I will donate those
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Old 2007.04.19, 12:31 AM   #11
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Cool

I Think I'm onto it...

I need,

1. Eagle Tree Systems MicroPower E-Logger V2
2. Eagle Tree Systems Power Panel LCD Display
3. Eagle Tree Systems Optical RPM Sensor
4. ICE Charger

I can use the LCD to get the RPM



Then I think I can just use the ICE to provide 4.5 volts to the (Source) side of the E-Logger V2



Then connect the motor to the (Load) side.

Then build a small wheel that can be driven off of the pinion gear. Paint half of the wheel black and the other half white. Then all I need to do is mount the Optical sensor to point 4mm away from the painted wheel.

I think I can actualy pull this off.

Thanks.
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Old 2007.04.19, 02:44 AM   #12
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This is what I use, but the one I like better was made by Yokomo which featured an external optical/rpm sensor allowing you to build a number of different types of stands for no-load and loaded tests.
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Old 2007.04.19, 06:47 AM   #13
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@rharris, you got the right idea.
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Old 2007.04.19, 07:53 AM   #14
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that is an interestedin peice of equipment.
http://www.teamorion.com/Products/Motor+Accessories/MPM

Team Orion's Motor Performance Monitor 2 w/CTX (in short called MPM), is designed to help keep your high performance racing motors at top-level performance. The new MPM2 allows you to check your motor’s RPM and current draw to evaluate performance and is built with the highest quality components, as found in all Team Orion products. The MPM2 also operates as a top of the line motor break in device and is the perfect power source for your commutator lathe.

The MPM 2 features the CTX mode, which allows for variable break in voltages and current draw readings during each motor test run.


Features:

· .01-7.99 output voltage
· 13 maximum continuous amps
· Dual internal cooling fans
· Pulse break-in
· 5-step pulse speed w/99 minute motor run delay
· 9 sound tones
· Blue back lit LCD screen
· 3-step motor speed up
· High-grade silicone hook-up wires

ORI41614 Motor Performance Monitor 2 w/CTX
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Old 2007.04.19, 10:05 AM   #15
rharris
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Quote:
Originally Posted by LBRC
but the one I like better was made by Yokomo which featured an external optical/rpm sensor allowing you to build a number of different types of stands for no-load and loaded tests.
You mean this?




Part# YZ-MMS
Yokomo Motor Maintenance System

1) Adjustable output voltage.
2) Capable of up to 10A draw.
3) Handles motor up to 7-turn wind.
4) Easy to read backlit LCD display.
5) Displays amp draw, rpm, and condition.
6) rpm sensor included.
7) Lightweight, compact design.

Retail Price: $230.00

Someone told me the RPM would not be correct becouse of the scale. Is this true?

Also, the Optical sensor from Eagle Tree is only good for 40,000 rpm but the magnetic sensor is good for 50,000 rpm. I notice you're Orion is at 47,000. Is there a direct plug in for 130 class motors for the Orion? Or did you have to build something?
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