Selecting the MOVIMOT® performance drive unit
Observe the following points when selecting the MOVIMOT® performance drive unit:
- Selection of a suitable gear unit size
(Specification: Helical-bevel gear unit) - Requirement: The maximum output torque of the gear unit must be greater than the maximum required application torque: Ma max ≥ Mmax.
- On the basis of the application calculations and taking account of the efficiency, the maximum application torque during startup (first travel section) is Mmax = 145 Nm
- Result: Helical-bevel gear units of size K.37 meet this requirement.
- Selecting the gear ratio with suitable output speed:
- Requirement: The application calculations result in a maximum required output speed of nmax = 50 min-1.
- To achieve a high setting range and an optimum efficiency, the required output speed should be achieved as precisely as possible at an input speed of ne = nN = 2000 min-1 (nominal motor speed).
- Result: As there is no ideal gear ratio
for the selected gear unit, the next smaller gear ratio available i = 37.97 is selected. - There are no external overhung loads acting on the gear shaft in this example.
- Choosing the right motor:
- Requirement: Select a motor/inverter combination that can provide at least
at peak performance. - Result: In the following table, select motor CM3C80S/D.. with the assigned 2.0 A inverter.
MOVIMOT® performance | CM3C.. | |||||||
|---|---|---|---|---|---|---|---|---|
80S/D.. | 80S/D.. | 80S/D.. | 80S/D.. | 80M/D.. | 80M/D.. | |||
Size of electronics cover | Size 1 | Size 1 | ||||||
Electronics cover (inverter) | 0020 | 0025 | 0032 | 0040 | 0040 | 0055 | ||
Nominal output current of the electronics cover (inverter) | IN_ | 2.0 A | 2.5 A | 3.2 A | 4.0 A | 4.0 A | 5.5 A | |
Nominal power | PN | 0.754 kW | 0.942 kW | 1.19 kW | 1.51 kW | 1.68 kW | 1.88 kW | |
Nominal torque | MN | 3.6 Nm | 4.5 Nm | 5.7 Nm | 7.2 Nm | 8 Nm | 9 Nm | |
Overload capacity of MN |
| 300% | 300% | 300% | 300% | 300% | 300% | |
- Checking further topics:
- Feasibility of the selected motor/gear unit combination
- Checking the setting range:
- Setting range of the application
- This means the speed setting range of 1:40 is sufficient. The encoder option needs not be selected. na at ne = 50 min-1
- Thermal check of the MOVIMOT® performance drive unit
- Requirement: In order to avoid thermal problems, the effective torque requirement of the application must be smaller than the continuous output torque of the MOVIMOT® performance drive unit.
- The effective torque requirement (including the efficiency of the application) is 45.1 Nm, which corresponds to a torque requirement of
at the motor shaft. - The selected motor/inverter combination CM3C80S/D.. with the assigned inverter 2.0 A has a nominal torque of 3.6 Nm.
- Result: The requirements are met.
- Checking further topics:
- Derating due to increased ambient temperature
- Derating due to installation altitude
- Checking the braking resistor
- Calculation of the regenerative power when decelerating:
- The remainder of the check takes place in accordance with chapter Regenerative current-carrying capacity of the integrated braking resistor.
