What is difference between inverter duty vs inverter ready motors?
These “inverter-ready” motors are suitable for use with variable torque loads over a wide speed range. In contrast, inverter-duty motors are wound with voltage spike-resistant insulation systems. and drive manufacturers about inverter rise times and effects of cable length.
How do you know if a motor is inverter duty?
Motor insulation systems that are rated for inverter use will be specified on the motor nameplate (or a sticker).
What is inverter duty rating?
Medium-voltage inverter-duty motors with a base rating that exceeds 600 V must be able to withstand a peak voltage equal to 2.04 times the motor’s rated line-to-line voltage. Rise times must equal or exceed 1 microsecond.
What is the difference between conventional induction motor and inverter duty motor?
In summary, general purpose motors can be run with drives in many applications; however inverter-duty motors are designed to handle much lower speeds without overheating and they are capable of withstanding higher voltage spikes without their insulation failing. With the increased performance comes an increase in cost.
Can you run an inverter duty motor without a VFD?
General-purpose motors don’t have to use a VFD though, they can be run directly off AC power, with power coming at a very clean and consistent sine wave at 60hz. This creates a steady flow of power with relatively few voltage peaks and little line noise as well.
How do inverter duty motors protect bearings?
Combining an insulated bearing on one end with a shaft grounding ring on the opposite end provides the best protection from electrical bearing damage.
Can non inverter duty motor with VFD?
If you have to use a non-inverter duty motor with a Variable Frequency drive (VFD), it’s wise to have some sort of harmonics filter, either a passive reactor or an active filter. It’s the harmonics that can cause excess heating and in come cases very high transient voltages that can break down insulation.
How Slow Can an inverter duty motor be?
Generally speaking, TEFC motors are not designed to operate at less than a 4:1 speed range, while some manufacturers make a 10:1 or 20:1 range motor. Most often, operating the motor slower than this requires an auxiliary cooling system.