Attention! Following information only apply for direct current motors of the series BG and GR/G.
For many applications, it is sufficiently accurate to take the most important data from the motor characteristic diagrams and data tables. Although tolerances and temperature influences are not taken into account, the data is accurate enough for approximate calculations. The degree of protection quoted relates only to the housing – adequate sealing of the shaft is the responsibility of the customer.
The values in the data tables are according to EN60034 and base on a „detached“ motor, which means mounted thermally insulated to a flange. Under real operating conditions, the nominal torque of the motor is much higher in most cases because a direct connection to the flange results in better heat dissipation.
When dimensioning the motor-gearbox-combination, it must be ensured that the specified values are not exceeded. If one of these values is exceeded, the result may be a reduced service life. If necessary, the motor torque must be reduced by current limitation and/or the unit must be mechanically protected against overload. The service life of gearbox units can also vary considerably depending on temperatures, acceleration torques and times, vibration and external impact forces. If, due to the application, designs with other materials or other lubricants are used, this can have a further influence on the service life. A comprehensive specification is available for each gear unit in addition to the catalogue specifications.
MN-Mo x i x ηGe ≤ MN-Ge
MAcc-Mo x i x ηGe ≤ MAcc-Ge
MN-Mo = Nominal Torque of Motor
i = Ratio of Gearbox
ηGe = Efficiency of Gearbox
MN-Ge = Nominal Torque of Gearbox
MAcc-Mo = Acceleration Torque of Motor
MAcc-Ge = Acceleration Torque of Gearbox
Based on the calculations it might be necessary to reduce the motor torque by limiting the motor current in order to bring it into the specified range. Another option is to add a coupling to the output-shaft of the gearbox and therefore make sure the gearbox is not overloaded.
In the wide range of Dunkermotoren products, you will find a suitable drive for almost any requirement in the power range of 1 - 4000 Watt.
The following points should be taken into account when selecting motors and gearboxes:
For dimensioning a suitable motor, determining the required torque plays a decisive role in order to avoid thermal overload of the motor. For combining a drive system consisting of motor and control electronics, it is important to ensure that permissible values for the motor are not exceeded by the electronics. Depending on the required output speed, either a motor or a motor-gearbox combination may be selected. The choice of a reduction gearbox will largely depend on the recommended maximum torque in continuous operation. For intermittent duty, loading above the rated torque is possible.
We will be pleased to carry out a precise adaptation of a motor to your operating conditions.