Lenze DSD - Manual (Page 313)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
313
11 Drive Dimensioning
11.2 Motor selection
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11.2 Motor selection
The DSD is specifically suitable for the dimensioning of motors on frequency inverters or servo in-
verters. For both combinations the calculations are based on the same model.
11.2.1 Motors for 87-Hz operation
87 Hz operation of standard asynchronous motors is completely integrated in the DSD for all invert-
ers. The advantage of this operating mode is that the motor speed in comparison to 50 Hz operation
is increased by 73 % at the same torque. Therefore also the nominal motor power rating is increased
by 73 %. Thus the motor utilisation is considerably better. For the inverter no savings result from
this.
• The rated speed for 4-pole motors in 87 Hz operation is approx. 2,500 rpm.
• For geared motors it has to be observed that the max. permissible input speed is not exceeded.
• 87 Hz operation is only possible on an inverter, the motor being actuated with 400 V Y / 230 V Δ
in delta connection. The rated V/f point is set to 400 V / 87 Hz.
• Motors which allow for 87-Hz operation are indicated in the motor selection table of DSD with
correspondingly converted data.
• The efficiency of the motor in 87-Hz operation is higher. Thus, compared to 50 Hz, the operation
is more efficient and a smaller frame size is required.

Tip!
11.2.2 Motors for 120-Hz operation
For applications with frequently alternating speed and low requirements to the dynamics, Lenze of-
fers motors in standard housing optimised for inverter operation.
• Efficiencies as with comparable IE2 motors, partly IE3 motors as well, but with considerably
smaller frame sizes.
• Often a more competitive alternative to servo motors.