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Khaul

Kato Standard SX power pack

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Yavianice

Hmpf.

 

Anyway I ordered the additional part and will report back with results when I have them. It was not easy to get them, that's for sure.

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Khaul

I think I have found something interesting on Kato SX and Tomix 1001-CL. The combination of Google translate with my limited knowledge of electronics makes for not much understanding, but I think I have a lead.

 

First of all, this page https://translate.google.com.au/translate?hl=en&sl=ja&u=https://lofthonsen.muragon.com/entry/354.html&prev=search contains something about hooking up the Tomix 1001-CL to an Arduino chip in order to get better low speed performance. It seems that the experiment resulting in buzzing noises: "The storage oscilloscope time axis was changed and the frequency was increased to 1.82 kHz. Throwing is useful, but the motor beat sounds were heard only when the shrill became high. KATO, TOMIX We were convinced that both companies' PWM frequency 20 kHz is intended to be outside the human audible frequency. The dream of autogenerating with Arduino analog PWM output became impossible to realize."

 

The same guy has done an evaluation of the Kato SX pack full of oscilloscope screenshots for @kvp to enjoy: https://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com.au&sl=ja&sp=nmt4&u=https://lofthonsen.muragon.com/entry/494.html&xid=17259,1500003,15700019,15700124,15700149,15700186,15700190,15700201&usg=ALkJrhiUfr0Hku7o8NyiTMHcR8VK0xlpmAhttps://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com.au&sl=ja&sp=nmt4&u=https://lofthonsen.muragon.com/entry/496.html&xid=17259,1500003,15700019,15700124,15700149,15700186,15700190,15700201&usg=ALkJrhi43vzEfGNMAvIBlKFAtn-zVkSr-w and finally https://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com.au&sl=ja&sp=nmt4&u=https://lofthonsen.muragon.com/entry/497.html&xid=17259,1500003,15700019,15700124,15700149,15700186,15700190,15700201&usg=ALkJrhj3egPgRNLy4zwl6U5QA7jXXe-W0g

Edited by Khaul
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kvp

Essentially, he determined that the 20 kHz range is the ideal PWM frequency to avoid noise and vibration. Tomix and the older Kato hyper dx use that.

 

Also the new Kato SX pack has an extremly noisy PWM output due to using an analog control circuit and non-stabilized power. And for some reason 5 times the PWM frequency.

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Khaul
2 hours ago, kvp said:

Essentially, he determined that the 20 kHz range is the ideal PWM frequency to avoid noise and vibration. Tomix and the older Kato hyper dx use that.

 

Also the new Kato SX pack has an extremly noisy PWM output due to using an analog control circuit and non-stabilized power. And for some reason 5 times the PWM frequency.

 

Besides the slight buzzing with some models, I find the Kato SX to perform better than the Tomix N-1001-CL at low speeds. Did you find a reason for that?

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kvp
2 hours ago, Khaul said:

Besides the slight buzzing with some models, I find the Kato SX to perform better than the Tomix N-1001-CL at low speeds. Did you find a reason for that?

Higher peaks. The Tomix units never go above (or even fully reach) 12V and the waveform is much smoother, the Kato goes way up to 13.2V with small sharp peaks, which is better for slow speed but heats up the motors faster and could cause vibration. The latter is imho just a side effect of the control circuit used in the Kato power pack.

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