Table of Contents
Advertisement
1.4.8 Motor Options
ViscoTwin
For
pump motors are optimized to deliver max torque in the 300 - 1200 rpm range at the
lowest performance requirement to save cost & complexity. Above 1200 rpms, the
motor can be used to boost CIP & water, as low viscous media doesn't require high torque. In order to use
the motor at higher rpm's, the VFD must be set to allow spin over 60 Hz. Most modern motors from
reputable manufacturers can handle the 4000 rpm's, as the shaft & bearings from 4-pole + motors are
typically the same as their 2-pole counterparts.
Sample with 7.5kW (10hp) Motor
DESCRIPTION
2-Pole Motor
4-Pole Motor
6-Pole Motor
8-Pole Motor
Gearmotors
Gearmotors are selected when higher torque is needed at lower power & CIP boosting isn't required.
The general limit on gearboxes for overspeeding is 1.5x to 2x to nominal speed.
The generic rule of thumb is:
Metric: (Kw x 9549) = RPM x Torque in Nm
Imperial: (HP x 5252) = RPM x Torque in lb-ft.
The torque value of an electric motor is approximately flat between 30 Hz to 60 Hz. Above 60 Hz, the
formulas above apply. Below 30 Hz, the loss in torque is very minimal.
PROCESSTEC INC. 2022
SPEED @ 50Hz
TORQUE @ 50Hz
2900 rpm
1450 rpm
965 rpm
725 rpm
1. ABOUT VISCOTWIN SCREW PUMPS
SPEED @ 60Hz
25 Nm/18 lb-ft
49 Nm/36 lb-ft
74 Nm/55 lb-ft
99 Nm/73 lb-ft
ViscoTwin
TORQUE @ 60Hz
3500 rpm
20 Nm/15 lb-ft
1750 rpm
41 Nm/30 lb-ft
1166 rpm
61 Nm/45 lb-ft
875 rpm
82 Nm/60 lb-ft
pump
Page 17
Advertisement
Table of Contents
