In general, a servo motor is a high-quality hydraulic motor, which is used particularly in the electro-hydraulic . The servo motor should therefore have the following characteristics:
- Uniform movements over a large range of speeds, velocities and loads (often more than 1:1,000). This means that the displacement, oil leakage flows and friction moments should be independent of the angle of rotation.
- Even at lower speeds or velocities, the movement must be free from stick slip .
- The inertia should be small to achieve a good dynamic performance.
- When moving from a standstill, slight pressure differences must enable it to break away.
- The movement should be equal in both directions.