Motors And Starters
Motor FLA, running current, starting current, horsepower, torque, overload, and starter sizing calculators.
Motors And Power Quality
Motor current, starter sizing, VFD checks, transformer kVA, generator load, harmonics, and power quality.
Subcategories
Motors, Starters And VFD
Motor current, torque, inertia, soft starter, bypass rating, VFD cable length, and drive load calculators.
Power Quality And Transformers
Transformer kVA, primary current, secondary current, impedance, inrush, K-factor, generator sizing, and UPS capacity.
Published Calculators
VFD Harmonic Current Calculator
Calculate per-drive and fleet harmonic RMS current from fundamental current, current THD, drive count, and an entered comparison reference.
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Transformer UPS Capacity Calculator
Provides a preliminary comparison of UPS apparent load and reserve-adjusted transformer demand against an entered transformer capacity.
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Transformer Short Circuit Contribution Calculator
Provides a preliminary transformer-limited fault-current estimate from transformer kVA, secondary voltage, phase model, and percent impedance.
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Transformer Service Factor Calculator
Provides a preliminary comparison of entered load kVA with a service-factor-adjusted transformer capacity when the factor is documented for the exact equipment and duty.
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Transformer Secondary Current Calculator
Provides a preliminary transformer secondary line-current estimate from rated kVA, secondary voltage, and a single-phase or balanced three-phase model.
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Transformer Primary Current Calculator
Provides a preliminary transformer primary line-current estimate from rated kVA, primary voltage, and a single-phase or balanced three-phase model.
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Transformer Inrush Duration Calculator
Calculate the cycles and seconds for a simplified transformer inrush current to decay from an initial multiplier to an entered target multiplier.
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Transformer Percent Impedance Test Calculator
Provides a transformer percent-impedance estimate from test voltage on the rated winding after confirming that test current matches the rated-current basis.
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Transformer Harmonic Heating Calculator
Calculate total RMS current and a THD-weighted transformer stray-loss factor from fundamental current, current THD, base stray loss, and an entered weighting multiplier.
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Transformer Grounding Resistor Calculator
Calculate neutral-grounding-resistor resistance, fault power, fault energy, and current-rating margin from entered voltage, fault current, and clearing duration.
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Transformer Generator Coordination Calculator
Compare transformer load with entered generator kVA and kW ratings, showing capacity margins and the limiting utilization.
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Transformer Delta-Wye Voltage Calculator
Calculate ideal secondary line-to-line and line-to-neutral voltage from primary line voltage, turns ratio, and the selected delta or wye connection.
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Transformer Cooling Load Calculator
Convert transformer losses and operating assumptions into adjusted heat load, BTU per hour, cooling tons, and daily heat energy for HVAC coordination.
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Transformer Bank Capacity Calculator
Calculate combined transformer-bank nameplate capacity, usable capacity, and reserved capacity for identical units under an entered utilization assumption.
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Motor Wye-Delta Current Calculator
Compare across-the-line and ideal wye-start current, reduction, and kVA from entered three-phase values.
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Motor Soft-Starter Current Calculator
Estimate across-line starting current, soft-start current limit, reduction, kVA, and comparison from entered motor values.
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Motor Torque From Power Calculator
Convert entered horsepower and speed into torque in lb-ft and N-m for the motor formula family.
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Motor Service Factor Load Calculator
Compare measured motor current with a service-factor current reference, utilization, margin, and nameplate percentage.
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Motor Multi-Speed Current Calculator
Estimate per-speed current from entered horsepower, efficiency, power factor, voltage, and phase values.
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Motor Feeder Voltage Drop Calculator
Estimate feeder running and starting-event voltage drop from aggregate current and a starting-motor scenario.
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Motor Horsepower From Torque Calculator
Convert entered torque and speed into mechanical horsepower and kilowatts for the motor formula family.
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Motor Feeder Calculator
Estimate multi-motor feeder current from entered motor currents and a largest-motor factor for qualified review.
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Motor Circuit Conductor Size Calculator
Estimate an entered motor conductor ampacity reference and compare it with selected ampacity for qualified review.
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Motor Branch Voltage Drop Calculator
Estimate running and starting voltage drop, terminal voltage, and approximate loss from entered motor branch-circuit values.
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