Formula ya nguvu ya motor ya awamu tatu ni ipi?

The active (real) power consumed by a three-phase motor is P = √3 × V_L × I_L × cos φ × η, where V_L is line voltage, I_L is line current, cos φ is power factor, and η is motor efficiency. Without η, the formula gives shaft input power.

Tofauti kati ya kW, kVA, na kVAR ni ipi?

kW is active (real) power that does useful work. kVA is apparent power — the total power drawn from the supply. kVAR is reactive power used to maintain magnetic fields. They form the power triangle: S² = P² + Q², where S is in kVA, P in kW, and Q in kVAR.

Kipengele cha kawaida cha nguvu kwa motor ya umeme ni kipi?

Kipengele cha kawaida cha nguvu kwa motors za induction wakati wa mzigo kamili ni 0.80–0.90. Wakati wa mizigo midogo, PF hupungua sana — motor yenye mzigo wa 25% inaweza kuwa na PF ya chini kama 0.40–0.55. Motors za synchronous zinaweza kufanya kazi kwa kipengele cha nguvu cha umoja au hata kinachopita umoja.

Ufanisi wa motor ni nini na unaathiri vipi hesabu ya nguvu?

Ufanisi wa motor η ni uwiano wa nguvu ya mwendo inayotoka kwa nguvu ya umeme inayoingia. Maadili ya kawaida: 85–96% kwa motors za kawaida, kulingana na ukubwa. Motors za ufanisi wa hali ya juu wa IE3 kwa kawaida huzidi 92%. Daima jumuisha η unapohesabu nguvu ya umeme inayoingia kutoka nguvu ya mwendo iliyokadiriwa.

Ninapataje mkondo wa motor kutoka kwa nguvu iliyoandikwa kwenye lebo?

Rearrange the formula: I = P / (√3 × V × cos φ × η). For example, a 15 kW motor at 400 V, PF 0.85, efficiency 0.91 draws I = 15000 / (√3 × 400 × 0.85 × 0.91) ≈ 28.0 A.

Zana ya Uhandisi Isiyolipisha

Kikokotoo cha Nguvu ya Mota ya Awamu Tatu

Calculate active power P = √3 × V × I × cos φ × η for three-phase motors. Bidirectional — solve for any variable. Also shows apparent & reactive power.

IEC 60034 Bidirectional Power Triangle

Solve For

Line Voltage (V)

Line Current (A)

Power Factor cos φ (0–1)

Efficiency η (0–1)

Active Power (kW)

Quick presets

Results

Active Power P

—

Nguvu Dhahiri S

—

Reactive Power Q

—

Line Current I

—

Kipengele cha Nguvu / Ufanisi

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Formula ya Nguvu ya Awamu Tatu

The active (real) power consumed or delivered by a three-phase AC circuit is:

P — active power (W or kW)
V_L — voltage ya laini-kwa-laini (V)
I_L — mkondo wa laini (A)
cos φ — kipengele cha nguvu (0–1)
η — ufanisi wa motor (0–1)

Power Triangle

Where S ni nguvu inayoonekana (kVA), P is active power (kW), and Q is reactive power (kVAR).

Mfano wa Vitendo

Mfano — Motor ya kW 15 kwa Volti 400

Given: P = 15 kW, V = 400 V, cos φ = 0.85, η = 0.91

I = P / (√3 × V × cos φ × η) = 15000 / (1.732 × 400 × 0.85 × 0.91) = 28.0 A

S = √3 × V × I = 1.732 × 400 × 28.0 = 19.40 kVA

Q = √(S² − P²) = √(19.40² − 15²) = 12.30 kVAR

💡 Tip: Unapohesabu nguvu ya umeme inayoingia kutoka kwa nguvu ya mitambo iliyopimwa kwenye motor, gawanya daima kwa ufanisi η. kW iliyoandikwa kwenye bamba kawaida ni nguvu ya mitambo inayotoka kwenye mhimili (shaft).

A reliable **three phase motor power calculator** is an essential tool for electrical engineers and technicians who need to quickly determine active, apparent, and reactive power values without performing manual computations. By inputting known parameters such as line voltage, line current, power factor, and efficiency, this three phase motor power calculator applies the standard formula P = √3 × V × I × cos φ × η to deliver accurate results in seconds. Its bidirectional functionality allows you to solve for any unknown variable, making it invaluable for motor sizing, load analysis, and energy auditing tasks.

Kikokotoo cha Nguvu ya Motor ya Awamu Tatu | Zana ya Bure Mtandaoni

Published by Nikolai Shelkovenko on Febuari 15, 2026 Machi 3, 2026

Results

Formula ya Nguvu ya Awamu Tatu

Power Triangle

Mfano wa Vitendo

Duka

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