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　　The BERGER LAHR5-phase stepping motor programme The BERGER LAHR 5-phase stepping motors are available in three sizes, relating to the approximate motor diameter (60 mm, 90 mm, 110 mm). Motors of the same size also differ in length. Technical differences within the single motor types are listed in the Data Specifications on this page.

　　All characteristic curves are given for constant currentoperation. They refer to the BERGER LAHR controllers with the respective power drives D 225, D 450, D 550 and D 650 as shown in the overview on page 8. Apart from the motor type and the power drive, the nominal winding current and the chopper voltage are indicated with each of the following characteristic curves: Torque-Stepping frequency characteristic (characteristic curve of the limiting operation torque) Start/stop frequency characteristic (stepping frequency at which the motor can start at a given load)Permissible load torque or inertia in start/stop operation (limiting start frequency dependent on the mass moment of inertia of the load) More detailed information on the meaning and use of the characteristic curves on page 9 and 10. The characteristic curves are valid for both, the full and half step operation. Reading of values with the help of the cooresponding frequency scale. The basic for the calculations carried out to be able to select the appropriate stepping motor for your drive tasks can be found in our documentation no.265 "Formulas & Calculations for Optimum Selection of a Stepping Motor".https://www.axcontroler.com/

　　Purpose of the brakes The holding brakes are used to hold the motor in position when the motor current has been switched off. In cases of emergency, e. g. power failure or EMERGENCY OFF, they stop the drive, thus contributing to the safety of the system. The brakes are required for applications in which gravity forces act on Z axes, e. g. in handling systems. . IUnction Outline drawing for 5-phase stepping motor VRDM 56../50 with holding brake The holding brakes are designed as electromagnetic spring pressure brakes. In order to disengage the brake, it must be electrically excited when the motor current is switched on. To avoid the risk of overheating, the current for the brake is reduced to holding voltage when the brake is still disengaged (see chart).

　　5-phase stepping motors can be factory-fitted with a BERGER LAHR encoder system. The encoder is integrated in the connector box so that there is no need for installation. Such motors are used together with the BERGER LAHR rotation moni toring system or the servo step ping motor system. The encoders for 5-phase stepping motors are equipped with a thermal relay (opener). The signal is on pin 11 of the encoder plug. The switching point is 95° C (+-3° C). Below the switching point there are + 5 Vat pin 11.

　　Plugs and connections Please refer to the chapter "Acces sories" (page 32) for information on the required connection cables. Thechapter "Connections" (page 31) will provide you with details on pin and connector assignments.

　　The temperature rise in a stepping motor depends on its electric drive and on the mode of operation. Maximum heat develops at medium step frequency. Therefore, heat dissipation is an important factor . Usually, the major amount of heat is carried off via the front flange, while the remaining heat is dissi pated into the ambient air. This latter portion may be considerably increased by means of cooling ele ments. Depending on the appli cation and the mounting position of the motor, these specially designed elements have a dissipation capa city of approx. 1 0 K. The actual motor temperature build-up must be determined by means of experi ments. Temperatures of 90~o 100°C at the motor housing approximately correspond to the maximum tempe rature as per insulation material class B in the motor inside (130° C). VRDM 56../50 and VRDM 59../50 motors are equipped with inte grated cooling ribs at the stator unit. These motors comply with insu lation materials class F (155° C).

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