motor overclocking, 9000RPM

I wasn't satisfied with the stock 1800RPM speed of this motor, so I decided to do a little "overclocking" the DIY way.

For the first half of the video, what you see is the motor being ramped up from 100Hz to 300Hz sinewave at 125VAC. This is a synchronous type AC induction motor, so increasing the frequency also increases the rotational speed.

The second half of the video shows the setup for this experiment. At 2:14 you can see the bulk of what is used. A high powered audio amplifier sits on top of a 24VDC 30A power supply, on the left side you can see a toroidal transformer, this is being used in reverse to step-up the output from the amplifier into something usable for the motor. 17V bumped up to about 125V.

Later, you can see the PC screen with oscilloscope and arbitrary waveform generator. The program is called SoundARB, is free and allows you to use your sound card as a function generator up to about 20kHz.

Category:

Science & Technology

Tags:

• AC
• motor
• powerful
• computer
• VFD
• variable
• frequency
• drive
• overclocking
• overspeeding

[x73rm]

nice linux machine... does it control the freq ??

[mturgeon2]

@x73rm Actually that is my Windows machine, and yes it is controlling the frequency (through the sound card via a waveform generator program) I haven't gotten around to buying a function generator yet.

The Linux machine can be seen briefly at 1:31 (the o'scope is sitting on top of it) and is a server running CentOS without a GUI.

[Amishman35]

Hook up a electric synchronous wall clock to the VFD and run it at the fastest speed that still has enough torque to move the hands....

[mturgeon2]

Unfortunately I don't have one of those. That would be interesting to try though.

I suspect however that it might not get very far, depending on if the clock motor has a shaded-pole type motor, which don't respond very well to frequency changes (torque goes down dramatically if the motor is operated off its design frequency).

[TehMG]

Yes but using the word "overclocking" makes the tittle more attractive ;)

[Paulisfalseprophet]

lol i wish i had an electric car... i'd love to overclock that thing :D

[TehMG]

@ljscott1990 With the amount of kinetic energy in that rotor... I'm not sure I'd want to do that. But you can go right ahead if you want.

[ljscott1990]

I dare you to put your finger in it.

[TehMG]

@palexandersquires No. Voltage is the same, frequency was increased. Higher frequency actually increases the effective impedance of the windings therefore current also goes down. Motor runs cooler at the higher frequency, with or without the fan. Motor produces almost no useful torque however, but this could be improved by increasing voltage along with the frequency.

[palexandersquires]

does the motor burn itself out?

[Lockythepilot]

DAMN! It hasn't flied up!

[c0rrupts3ct0r555]

its over 9000!

[TehMG]

@NightWolfx03 Yep.

[NightWolfx03]

Is that amplifier from Sure Electronics ?

[hameeds01]

nice work man

[sajabz2007]

@TehMG I .. need .. to .. know .. more! argh the "wait a minute how does that work" receptors in my brain just starting firing like it was 1941 and my life depended on it! :)