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Motor Torque Equation (3-Phase):
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Motor torque calculation estimates the rotational force produced by an electric motor based on current input and the motor's torque constant. This is essential for motor selection, performance analysis, and system design in various applications.
The calculator uses the 3-phase motor torque equation:
Where:
Explanation: The equation calculates torque by multiplying current with the torque constant and dividing by the square root of 3 for three-phase motor systems, accounting for the phase relationship in polyphase systems.
Details: Accurate torque calculation is crucial for motor sizing, load matching, efficiency optimization, and preventing motor overload or underutilization in industrial and automotive applications.
Tips: Enter current in amperes (A) and torque constant in newton-meters per ampere (Nm/A). Both values must be positive numbers. The calculator automatically applies the three-phase correction factor.
Q1: What is the torque constant (K_t)?
A: The torque constant represents the motor's ability to convert electrical current into mechanical torque, typically provided in the motor's datasheet in Nm/A.
Q2: Why divide by √3 for three-phase motors?
A: The √3 factor accounts for the phase relationship in three-phase systems, where the total current is distributed across three phases rather than concentrated in a single phase.
Q3: Can this calculator be used for single-phase motors?
A: No, this calculator is specifically for three-phase motors. For single-phase motors, the equation would be T = I × K_t without the √3 divisor.
Q4: What are typical torque constant values?
A: Torque constants vary by motor type and size, typically ranging from 0.01 Nm/A for small motors to 2.0 Nm/A or more for large industrial motors.
Q5: How accurate is this calculation?
A: This provides a theoretical estimate. Actual torque may vary due to factors like motor efficiency, temperature, magnetic saturation, and mechanical losses.