Elevator Motor Power
Calculate the motor power of an elevator, P = m·g·v ÷ η, from the payload m (kg), gravity g (9.81 m/s²), nominal speed v (m/s) and the system efficiency η (motor, gearbox, sheaves). The result, in watts, is the mechanical power needed to hoist the load at nominal speed. In practice, the counterweight (balancing the car plus ~45% of the load) reduces the effective power, and regenerative braking on descent can return some to the system. It is the base calculation for sizing the traction machine. Enter the load, the speed and the efficiency.
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Potência do motor de elevador
A potência do motor de um elevador é a potência mecânica necessária para içar a carga à velocidade nominal: P = m·g·v ÷ η, onde m é a carga útil, g a gravidade, v a velocidade e η o rendimento do conjunto de tração (motor + redutor + polias, tipicamente 0,6-0,85). O resultado é a potência de pico no içamento. Mas o cálculo prático tem uma sutileza importante: o contrapeso. Um elevador não levanta a carga 'do zero' — o contrapeso (que equilibra a cabine mais ~45% da carga nominal) faz quase todo o trabalho de equilíbrio, e o motor só precisa vencer o desbalanceamento. Por isso a potência efetiva é muito menor que içar a carga total. Além disso, elevadores modernos com acionamento de frequência variável (VVVF) e regeneração devolvem energia à rede na descida (quando o contrapeso desce com a cabine leve). Esta fórmula dá a referência base; o dimensionamento real considera o contrapeso, o ciclo de trabalho, as acelerações e o rendimento de cada componente. Informe a carga, a velocidade e o rendimento.
Related Tools
Handling Capacity (5 min)
Calculate an elevator's handling capacity over 5 minutes, HC = (300 × Q) ÷ RTT, from the car capacity Q (people) and the round trip time RTT (s). The result, in people carried per 5 minutes, is the standard vertical-traffic performance metric (building peak demand is usually measured over 5 min). The factor 300 is the seconds in 5 minutes. Multiplied by the number of elevators and compared with the building population, it tells whether the system meets demand (typically 12-15% of the population in 5 min in offices). Enter the car capacity and the RTT.
Building Population
Estimate a building's population, Pop = (area per floor × number of floors) ÷ density, from the usable area per floor (m²), the number of floors and the occupancy density (m² per person). The result, in people, is the total population to be served by the vertical transport — the starting point of elevator traffic analysis. Occupancy density varies with use: ~10 m²/person in dense offices, ~15-20 m²/person in standard offices, with specific values for hotels and residences. Compared with the elevators' handling capacity, it tells whether the system is adequate. Enter the area per floor, the number of floors and the density.
Motor Power (Torque × RPM)
Compute a motor's mechanical power from torque and rotation, P = τ·ω = τ·2π·n/60, where τ is the torque (N·m), n the rotation (rpm) and P the power (W). It is the fundamental relation linking the three quantities of a rotating motor: the same motor delivers high torque at low speed or high speed at low torque, but the power is the product of the two. The basis of drive sizing. Enter the torque and the rotation.
The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.