Basic calculation process
The kinematic target values of the application are calculated first if they are not initially known. These include:
- Cycle time
- Distances
- Speeds/rotational speeds
- Accelerations
The calculated kinematic target values are used to calculate the dynamic torques. The resulting static torques for the gear unit output are calculated based on specified friction or hoist loads. Existing additional transmissions must be taken into account when the torques and rotational speeds are calculated. A suitable gear unit size is determined based on the maximum occurring torque. In order to select a gear ratio, the type of motor must be specified.
The requirements of the application are converted to the motor side. A motor is selected based on a maximum and an effective operating point.
A motor brake must always be selected for applications with a hoist load. The motor brake is selected as necessary for other applications. Criteria such as required holding reliability, permitted braking work and maximum braking distances are used as the basis for calculation and selection. The mechanical feasibility of the drive train as well as the gear unit load during emergency stop braking is then verified.
Frequency inverter selection is often based on the maximum and effective motor current required. A braking resistor is additionally required if the motor operates as a generator during deceleration. It converts the regenerative energy returned by the application into heat.
