Motor Capacitor Calculator

How Motor Capacitor works

The result comes from Xc = V ÷ I. Motor Capacitor uses Supply voltage, Capacitor current to report Capacitive reactance target.

With the loaded values, capacitive reactance target evaluates to 76.67 Ω. Change only the quantity being investigated. Compare this result with Motor Overload Setting Calculator when overload current setting is also needed.

Inputs for Motor Capacitor

Supply voltage and Capacitor current belong to Motor Capacitor. Keep source units with supply voltage. If the next question concerns motor current, open Motor Power Current Calculator.

Treat the preset entries as an arithmetic example. Supply measurements or ratings from the actual circuit.

Supply voltage

Example entry: 230 V.

Capacitor current

Example entry: 3 A.

Reading the Motor Capacitor result

This output represents Motor Capacitor.

Standard size, duty, temperature, and transient checks remain outside this single equation.

Measurement and units

Motor nameplate data, duty, enclosure, starting method, load profile, and thermal limits govern final selection. Check prefixes on supply voltage.

Scenario differences are meaningful only with consistent units and observation points. Use Synchronous Motor Speed Calculator as the follow-up for synchronous speed.

Limits of this calculation

A complete capacitor selection also needs frequency and motor design data. For motor efficiency, use Motor Efficiency Calculator.

The arithmetic is intentionally narrower than a complete circuit model. Unentered effects remain outside Motor Capacitor.

A useful Motor Capacitor comparison

Record capacitive reactance target before testing a different supply voltage value.

Document the alternate supply voltage source.

Questions about Motor Capacitor