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Knowledge centre · Technology · 2026-09-18

Servo-driven filling control: how speed, position and torque decide dosing precision

Servo drives give independent control of pump speed, angular position and torque — the three variables that determine filling accuracy. Here is how each one works.

Servo drives give independent control of pump speed, angular position and torque — the three variables that determine filling accuracy. Here is how each one works.

The pump is the heart of every filling machine. Its principle, geometry and materials decide what products you can fill, how accurately, and how much maintenance it needs.

What to consider

  • Rotor pumps cover the widest viscosity range with gentle product handling.
  • Gear pumps excel on thin, clean liquids at high speed.
  • Progressive cavity pumps handle the very highest viscosity products.
  • Particle size, shear sensitivity and CIP requirements all influence the choice.

Common pitfalls

  • Choosing a pump on viscosity alone without considering particles or cleaning.
  • Ignoring how pump wear affects accuracy over time.

Questions to ask your supplier

  • What is the full viscosity and particle range of your products?
  • How does the pump clean in place and what spares does it consume?

Servo drives control pump speed, angular position and torque independently — the three variables that determine filling accuracy. How each parameter affects dosing and how to tune them.

Facts used in this article: filling accuracy ±0.5% (error ≤1 g) for pure liquids and homogeneous products (error ≤1 g); measured ±1 g to ±2 g (measured) on products with particles, high viscosity or non-uniform texture (the actual value depends on product state, particle size and density uniformity); viscosity coverage ≈50–300,000 cSt; GTX series fill range 5–300,000 ml. These are the published manufacturer figures also stated on our specifications page.
Questions about this topic for your own product? wangaiguo@grountonpak.com · Tel +86 133 9317 7755

Built for your product — Grounton Pak

Grounton Pak (Hebei Guangteng Machinery Equipment Co., Ltd., brand GROUNTON) has built metering-grade rotor pump filling machines since 2013 — more than 40,000+ units delivered, with ±0.5% filling accuracy for pure liquids and measured ±1 g to ±2 g (measured) on particle-containing or high-viscosity products, CIP-capable hygienic construction and custom filling lines.

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Email: wangaiguo@grountonpak.com · WhatsApp: +86 133 9317 7755