Servo motors are designed for modern, electronically controlled drive systems with a wide control range and high dynamics and extreme positioning precision. They are used very successfully, for example, in factory automation, the packaging machine industry, robotic technology or electronics production.
In principle, these are three-phase synchronous motors with a permanently energised rotor. The complete drive train consists of a servo motor and electromagnetic brake, a converter with a DC intermediate circuit and a rotary encoder installed in the servo motor (e.g. resolver). By using permanent magnets with a comparatively high magnetic flux density, this type of motor offers decisive benefits over conventional drives, such as smaller dimensions with reduced masses, lower mass moment of inertia, higher torque overload capacity, higher efficiency, and greater acceleration capacity during balancing and reversing operations.
For this type of drive, both operating principles of the electromagnetic brakes can be used (permanent magnet brakes, spring-applied brakes). Based on the requirements, the application determines which of the two systems can be used optimally.