Resolver Calibration and Maintenance

Unlike encoders, resolvers consist entirely of coil windings without glass disks or electronics. They are used in heavy industries with extreme heat and vibration. Although robust, changes in coil resistance or mechanical angle shifts cause position errors over time.

Resolver Fault Symptoms

• Position error and positioning drift
• Resolver / feedback alarm
• Angle shift, motor runaway
• Loss of synchronization with the drive

Our Resolver Lab Process

We run insulation and impedance tests on the stator and rotor coils, analyse signal amplitude with an oscilloscope, then perform resolver zero-point alignment and calibration. See our services.

Resolver or Encoder?

Resolvers are durable but require calibration; encoders offer optical precision. We also offer encoder calibration.

Frequently Asked Questions

What is the difference between a resolver and an encoder?

A resolver is all-coil and more durable; an encoder uses an optical disk and is more precise.

Why is resolver zero-point alignment needed?

Without zero-point alignment the motor shows position errors; calibration is essential.

Are resolvers really durable?

Yes, they withstand heat and vibration; calibration may still be needed for angle shift over time.

Is there a warranty after repair?

Yes. Every calibrated resolver is delivered under warranty after testing.