Chapter 3 How to Select the Right AC Motor Drive
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C200 Series
3-1
Chapter 3 How to Select the Right AC
Motor Drive
The choice of the right AC motor drive for the application is very important and has great influence on its
lifetime. If the capacity of AC motor drive is too large, it cannot offer complete protection to the motor and
motor maybe damaged. If the capacity of AC motor drive is too small, it cannot offer the required
performance and the AC motor drive maybe damaged due to overloading.
But by simply selecting the AC motor drive of the same capacity as the motor, user application
requirements cannot be met completely. Therefore, a designer should consider all the conditions,
including load type, load speed, load characteristic, operation method, rated output, rated speed, power
and the change of load capacity. The following table lists the factors you need to consider, depending on
your requirements.
Related Specification
Item
Speed and
torque
characteristics
Time ratings
Overload
capacity
Starting
torque
Load type
Friction load and weight load
Liquid (viscous) load
Inertia load
Load with power transmission
●
●
Load speed and
torque characteristics
Constant torque
Constant output
Decreasing torque
Decreasing output
●
●
Load characteristics
Constant load
Shock load
Repetitive load
High starting torque
Low starting torque
●
●
●
●
Continuous operation, Short-time operation
Long-time operation at medium/low speeds
●
●
Maximum output current (instantaneous)
Constant output current (continuous)
●
●
Maximum frequency, Base frequency
●
Power supply transformer capacity or percentage
impedance
Voltage fluctuations and unbalance
Number of phases, single phase protection
Frequency
●
●
Mechanical friction, losses in wiring
●
●
Duty cycle modification
●
Call 1(800)985-6929 for Sales
deltaacdrives.com
sales@deltaacdrives.com
Call 1(800)985-6929 for Sales
deltaacdrives.com
sales@deltaacdrives.com
