In most cases, EPAct Motors with 2:1 Constant Torque ratings and 4:1 to10:1 Variable Torque ratings can be run on VFDs. It is important to note, however, that many fractional and 56-frame motors are not rated for use with VFDs.

A variable frequency drive (VFD) can be used to control multiple motors in some applications provided the right design considerations are made and appropriate protection is provided for each motor. The VFD must be sized properly, and each motor needs protection.

1. You can even run more than 2 motors on a single variable frequency drive; it is absolutely OK, I am using it for quite a long time and the VFD is just working very fine. 2.

VFDs have an adjustable overload parameter to protect the motor. Drives come standard with electronic thermal overload protection allowing the VFD to deliver 150% of the rated output current for 1 minute and higher current levels for shorter periods. The overload can be adjusted to protect smaller motors.

An oversized VFD can be used for a smaller HP motor. The advantage of this application is that if the motor requirements increase, the VFD may be large enough to still handle the increased load.

Having two motors directly driving the same gear on the shaft seems like the first obvious answer, but error prone (slipping out of sync and grinding potentially.) Two motors driving two separate pulleys on the driven shaft, which should theoretically gain power without the gear jamming issues.

No skill is needed to couple two engines together. A V8 is essentially 8 one-cylinder engines tied together. Large ship engines come in 4,6,8,10,12,14,16 cylinder versions. Several auto companies, including Renault and Audi, have built ‘W’ engines by chaining together two V-4 engines.

Vector control, also called field-oriented control (FOC), is a variable-frequency drive (VFD) control method in which the stator currents of a three-phase AC or brushless DC electric motor are identified as two orthogonal components that can be visualized with a vector.

Variable frequency drives can operate as motor protection devices along with their role as motor speed controllers. In most VFD applications the VFD itself provides overload protection for the motor. However, the feeder cable can’t be protected by variable frequency drive built-in protection.

Wiring multiple motors on a single VFD, certain conditions, considerations and safety must be met, here are few guidelines you’d better follow to avoid failures: Variable frequency drive should be at least 20% more power of the two or three motors’ power clubbed together. Set variable frequency drive to V/F mode, no vector control at all.

Reduced-diameter shielded motor cable for VFD drives designed with a special Surge Guard insulation system to withstand nonlinear power distortions. ÖLFLEX® VFD WITH SIGNAL Extremely oil and UV-resistant shielded motor power cable for VFD drives with an additional control pair for a brake or temperature sensor. ÖLFLEX® VFD 1XL

VFD Cables from Belden support variable-frequency AC motor drives in harsh operating settings. The cables are built to withstand high voltage spikes, high noise levels and adverse environmental conditions.

Single VFD for Multiple Motors A single variable frequency drive (VFD) may control 2 or 3 motors at a time, multiple motors control is usually done because of budget considerations. When in this example below, a cooling tower with 4 equally sized motors are controlled by one variable frequency drive.