Motor slip

This tool calculates the efficiency of an electric motor as the ratio between shaft output power and electrical input power. Typical efficiency ranges from 70% to 96%. Input motor parameters to automatically calculate: Electrical input power (kW) Motor efficiency (%) Supports single-, two-, and three-phase systems Real-time bidirectional calculation Key Formulas Electrical Input Power: Single-phase: P_in = V × I × PF Two-phase: P_in = √2 × V × I × PF Three-phase: P_in = √3 × V × I × PF Efficiency: % = (P_out / P_in) × 100% Example Calculations Example 1: Three-phase motor, 400V, 10A, PF=0.85, P_out=5.5kW → P_in = √3 × 400 × 10 × 0.85 ≈ 5.95 kW Efficiency = (5.5 / 5.95) × 100% ≈ 92.4% Example 2: Single-phase motor, 230V, 5A, PF=0.8, P_out=1.1kW → P_in = 230 × 5 × 0.8 = 0.92 kW Efficiency = (1.1 / 0.92) × 100% ≈ 119.6% (Invalid!) Important Notes Input data must be accurate Efficiency cannot exceed 100% Use high-precision instruments Efficiency varies with load

This tool calculates the running and starting capacitor values needed to operate a three-phase induction motor on single-phase power. Suitable for small motors (< 1.5 kW), with output power reduced to 60–70%. Input motor rated power, single-phase voltage, and frequency to automatically calculate: Running capacitor (μF) Starting capacitor (μF) Supports kW and hp units Real-time bidirectional calculation Key Formulas Running Capacitor: C_run = (2800 × P) / (V² × f) Starting Capacitor: C_start = 2.5 × C_run Where: P: Motor power (kW) V: Single-phase voltage (V) f: Frequency (Hz) Example Calculations Example 1: 1.1 kW motor, 230 V, 50 Hz → C_run = (2800 × 1.1) / (230² × 50) ≈ 11.65 μF C_start = 2.5 × 11.65 ≈ 29.1 μF Example 2: 0.75 kW motor, 110 V, 60 Hz → C_run = (2800 × 0.75) / (110² × 60) ≈ 2.9 μF C_start = 2.5 × 2.9 ≈ 7.25 μF Important Notes Only suitable for small motors (< 1.5 kW) Output power drops to 60–70% of original Use capacitors rated at 400V AC or higher Starting capacitor must be automatically disconnected Motor should be connected in "Y" configuration

This tool calculates the power factor (PF) of an electric motor as the ratio between active power and apparent power. Typical values range from 0.7 to 0.95. Input motor parameters to automatically calculate: Power Factor (PF) Apparent Power (kVA) Reactive Power (kVAR) Phase Angle (φ) Supports single-, two-, and three-phase systems Key Formulas Apparent Power: Single-phase: S = V × I Two-phase: S = √2 × V × I Three-phase: S = √3 × V × I Power Factor: PF = P / S Reactive Power: Q = √(S² - P²) Phase Angle: φ = arccos(PF) Example Calculations Example 1: Three-phase motor, 400V, 10A, P=5.5kW → S = √3 × 400 × 10 = 6.928 kVA PF = 5.5 / 6.928 ≈ 0.80 φ = arccos(0.80) ≈ 36.9° Example 2: Single-phase motor, 230V, 5A, P=0.92kW → S = 230 × 5 = 1.15 kVA PF = 0.92 / 1.15 ≈ 0.80 Important Notes Input data must be accurate PF cannot exceed 1 Use high-precision instruments PF varies with load

This tool calculates the starting capacitor value (μF) required for a single-phase induction motor to start properly. Input motor parameters to automatically calculate: Starting capacitor value (μF) Supports 50Hz and 60Hz systems Real-time bidirectional calculation Capacitor validation Key Formula Starting Capacitor Calculation: C_s = (1950 × P) / (V × f) Where: C_s: Starting capacitor (μF) P: Motor power (kW) V: Voltage (V) f: Frequency (Hz) Example Calculations Example 1: Motor power=0.5kW, Voltage=230V, Frequency=50Hz → C_s = (1950 × 0.5) / (230 × 50) ≈ 84.8 μF Example 2: Motor power=1.5kW, Voltage=230V, Frequency=50Hz → C_s = (1950 × 1.5) / (230 × 50) ≈ 254 μF Important Notes Starting capacitor is only used during startup Use CBB-type capacitors only Must be disconnected after startup Voltage and frequency must match