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
Motor Branch Circuit Protection Calculator
Estimate an entered motor protection reference and compare it with a selected rating for qualified review.
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VFD Volts-per-Hertz Calculator
Calculate a VFD base volts-per-hertz reference from motor nameplate voltage and frequency using the specified drive manual.
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VFD DC Bus Voltage Calculator
Compare expected and measured VFD DC bus voltage and express recorded ripple as a percentage.
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VFD Dynamic Braking Resistor Calculator
Calculate braking energy, peak resistor power, average duty power, and minimum resistance from entered inertia and speed change.
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Transformer Tap Voltage Calculator
Calculate no-load secondary voltage at a signed tap position and identify the nearest listed tap for a target voltage.
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Transformer Losses Calculator
Calculate total transformer loss, input power, and efficiency from core loss, load loss, and output power.
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Transformer Regulation Calculator
Calculate transformer voltage regulation and voltage difference from no-load and full-load measurements.
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Transformer K-Factor Calculator
Calculate transformer K-factor from a harmonic current spectrum using an explicit reference basis.
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Transformer Efficiency Calculator
Calculate transformer efficiency from measured input and output power, including efficiency percentage and power loss.
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Transformer All-Day Efficiency Calculator
Calculate time-weighted transformer efficiency and daily energy values from entered loss data and a load profile.
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Power Quality Crest Factor Calculator
Summarize peak-to-RMS waveform behavior before a broader power-quality review.
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Motor VFD Cable Length Calculator
Compare the entered VFD-to-motor cable run with the exact drive manual limit and show remaining margin and percentage used. It does not create a universal safe-length rule.
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Motor Synchronous Speed Calculator
Calculate rotating-field speed as a reference for induction-motor slip. The result does not predict loaded rotor speed or select equipment.
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Motor Slip Frequency Calculator
Express motor slip as frequency for a motor or drive review. The result does not diagnose a motor or tune a drive.
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Motor Reflected Inertia Calculator
Combine multiple load-inertia rows before an acceleration, braking, or drive-sizing review.
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Motor Load Percentage Calculator
Review motor loading from measured input power or a documented electrical-power estimate. The calculation does not infer load from current alone.
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Motor Current Unbalance Calculator
Review a recorded three-phase motor current set during maintenance or commissioning. The result does not diagnose the motor or choose a repair.
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Motor Acceleration Time Calculator
Calculate acceleration time from total inertia, starting and ending speed, and average net torque. The result supports a transparent timing review before drive or starter selection.
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Voltage Sag Calculator
Estimates voltage sag and remaining voltage from system voltage, available fault current, and a load-current step for initial power-quality review.
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VFD Sizing Calculator
Compares required VFD output current with an entered drive rating using motor FLA, application multiplier, derating factor, and system voltage.
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Transformer Voltage Drop Calculator
Estimates transformer voltage regulation, voltage drop, and loaded secondary voltage from nameplate resistance, reactance, load level, and power factor.
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Transformer Voltage Ratio Calculator
Compares primary and secondary voltage values into ideal transformer voltage ratio and inverse voltage relationship.
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Transformer Inrush Current Calculator
Estimates transformer rated current and planning inrush current from kVA, voltage, phase, and a documented inrush multiplier.
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Transformer kVA Calculator
Estimates apparent power and real power for a single-phase or balanced three-phase transformer load from line voltage, current, phase, and power factor.
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