Equipment & Systems
Motor Systems
Check motor current, output, voltage drop, overload settings, and drive compatibility.
Not sure where to start? Choose by task and required inputs.
Multiple Motor Feeder CalculatorEstimate feeder current from multiple motor currents and largest-motor adder.Motor Speed and Slip CalculatorCalculate synchronous speed and induction motor slip.Motor Starting Current CalculatorEstimate locked-rotor current from full-load current and multiplier.VFD Motor Speed CalculatorEstimate motor speed from drive frequency and slip.Motor Full-Load Current and Circuit Protection ReferenceLook up motor table FLC, branch-conductor ampacity, and general protection limits.Motor Overload Protection Setting ReferenceCalculate normal and conditional overload trip-current limits.Motor Energy Cost CalculatorEstimate electrical input power, annual energy, and operating cost from shaft load and efficiency.Motor Efficiency Upgrade Payback CalculatorCompare energy costs at equal shaft duty and estimate simple payback for a replacement motor.Pump and Fan Speed Energy CalculatorEstimate relative flow, head, and shaft power at a changed speed using ideal affinity laws.Motor Voltage Drop EstimatorEstimate running and starting voltage drop from motor and conductor data.Three-Phase Motor Power and Torque CalculatorEstimate motor input power, shaft horsepower, and torque.VFD and Motor Compatibility WorksheetScreen rated current and track manufacturer review items.
Which tool fits your task?
Keep table current, measured operating values, nameplate overload inputs and drive compatibility distinct. Pick the task first, then transcribe the data required by that method.
| Your task | Inputs to collect | Tool and scope |
|---|---|---|
| Look up motor circuit current and protection limits | Supported motor type, horsepower, voltage and lookup conditions. | Motor Full-Load Current and Circuit Protection Reference Table full-load current and actual nameplate current have different uses. |
| Estimate shaft output and torque from operating readings | Matched terminal electrical readings, efficiency and speed. | Three-Phase Motor Power and Torque Calculator An operating estimate does not replace a motor circuit lookup. |
| Review motor overload trip-current limits | Nameplate current and the motor characteristics required by the tool. | Motor Overload Protection Setting Reference Trip-current limits are not a universal relay dial setting. |
| Screen a VFD against motor rated current | Motor and drive rated current plus manufacturer review items. | VFD and Motor Compatibility Worksheet The worksheet does not establish complete drive/motor compatibility. |