November 23, 2022

Patented regeneration function simplifies servo applications

Patented regeneration function simplifies servo applications

May 11, 2022

US motor and control manufacturer Teknic has obtained a US patent for a method of dissipating energy harvested from mechanical loads connected to servo motors during braking. He says this feature – which he calls VRS (Vector Regenerative Shunt) – will simplify servo drives by eliminating the need for external regenerative circuits and shunts, reducing cost, space requirements, wiring and system complexity. .

Motors often perform braking operations where kinetic energy is transferred from a load to the motor. This regenerative energy can be captured when decelerating connected loads, using hoists to lower loads, retracting loads from compressed springs, etc. The regenerated energy is returned to the motor inverter circuit and transferred to a DC voltage bus in the motor drive circuit.

In AC-powered applications, the regenerated power is typically fed back to a capacitor bank. But capacitors have energy storage limits, so machine designers must either reduce the amount of kinetic energy produced or dump excess regenerative energy elsewhere. Traditionally, the most common way to deal with this excess energy has been to direct it to a resistive load and convert the energy into heat. However, this adds complexity and cost.

TechnicalThe VRS feature dissipates regenerative energy by using the motor windings to manage the energy. In many applications, it will allow a servo motor to be used without any external regenerative components, according to the company, reducing system costs, wiring and complexity. The technology has been awarded US Patent 10,500,972 B2.

Teknic offers its new brake energy dissipation feature on its ClearPath integrated servo motors

Teknic offers this feature on its ClearPath integrated servos. The feature is activated as easily as clicking a checkbox.