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Selection Steps

  1. Determine system (machinery/ application).
  2. Determine operating mode (duty cycle, speed, acceleration/deceleration time, positioning time).
  3. Calculate acceleration, and load acceleration force: $$F_a=ma$$ where
    m: Load Mass (kg)
    a: Acceleration (m/s2)
  4. Temporarily select a motor meeting the requirements of force.
  5. Calculate peak force: $$F_{max}=F_1=Ma+\mu Mg+F_e$$ where
    M: Total Mass (kg)
    F1: Acceleration Force (N)
    Fe: External Force (N)
    µ: Friction Coefficient
    g: Gravity Acceleration (9.8m/s2)
    External force is positive when it is against the direction of operation.
  6. Calculate continuous force
    Uniform force (N): \(F_2=\ \mu Mg+F_e\)
    Deceleration force (N): \(F_3=Ma-\mu Mg+F_e\)
    Continuous force (N): $$F_{RMS} = \sqrt { \frac{1}{(t_1+t_2+\cdots+t_n)} \left (t_1 \cdot {F_1}^2 + t_2 \cdot {F_2}^2 + \cdots + t_n \cdot {F_n}^2 \right)}$$
  7. Confirm motor selection requirements:
    The maximum force of the motor is larger than F1;
    The continuous force of the motor is larger than F2 and FRMS.
  8. Rated power and maximum power should be calculated if required: $$P=F \cdot v$$

Selection Diagram