This paper describes active control of vibration, which is generated in a vibration isolation system in an automatic guided vehicle, using controlled electromagnets. To suppress the vibration due to resonance, an active vibration isolator is added to the passive vibration isolation system. The experimental apparatus consists of two rigid plates, eight rubber springs and four sets of active vibration isolators. One set of active vibration isolators has an electromagnet, a power amplifier, a controller, a displacement sensor and an acceleration pickup. An absolute velocity feedback damps the vibration isolation system and realizes a skyhook damper. Vibration tests show that the use of controlled electromagnets increases the structural damping of the vibration isolation system and reduces the vibration amplitude in the system.