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About
About Jintao Chen and this site
I am a sales engineer at XActant, which builds low-voltage DC servo drives and embedded servo drive cores. This site is where I keep the engineering notes I would otherwise repeat on customer calls — and where I publish them so that someone else searching for the same problem can find an answer that is not a brochure.
Why this site exists
Most of what is published about servo drives is either a datasheet or a brochure. Neither is very useful when you are trying to work out whether a drive is going to solve your specific motion problem. The useful information is usually the kind that only shows up after a few hundred conversations: which specification actually matters for your process, which published figure is being measured differently than you assume, and where a manufacturer will be straight with you about a limitation.
I write here because it is faster for everyone. If a note answers your question before a call, we both get something useful out of the day.
What I cover
- Low-voltage DC servo drives — 24 to 48 VDC, 2 to 28 Arms, EtherCAT / CANopen / Modbus / pulse-direction
- Current-based force control and soft-landing applications
- Encoder interface selection — incremental ABZ and absolute BiSS-C, SSI, EnDat 2.2, Tamagawa, Nikon
- EtherCAT timing, multi-axis synchronisation and motion profiles
- Servo gain tuning and mechanical matching
- Functional safety topics, mainly where STO ends and the risk assessment begins
- Embedded drive cores for machine builders who bring their own controller
What this site is not
It is not the official XActant website. I am an employee, not the owner of this property, and I am not authorised to publish prices, lead times or commercial terms here. Anything commercial goes through a quotation.
It does not replace a datasheet. The figures I quote come from published specifications, but the current revision of a manual always wins over anything I write.
It is not consultancy. I do not design machines for a fee. If you need a motion engineer, I will point you to one.
How to reach me
Email is the best channel — tao3340459784@gmail.com. WhatsApp (+86 18038325973) works for quick questions and for customers outside China. For a quotation, send me the motor model, the bus interface, the payload or stroke, and the axis count, and I will route it to the right desk and come back with a written answer.
The company behind the products
Registered information, qualifications, patent and software-copyright counts, and the full development history from the first servo drive in 2016 to the present — all from the public company record, so you can verify it independently.