First, a servo motor is an engine that controls the operation of mechanical components in a servo system; it is a type of auxiliary motor with indirect speed change.
Positioning or residual torque: The torque required to rotate the output shaft of a motor when no current flows through the winding.
Driver: An electrical control device used to operate a stepper motor. This includes a power supply, a logic programmer, switching elements, and a variable frequency pulse source that determines the stepping rate.
Dynamic torque: The torque generated by a motor at a certain stepping speed. Dynamic torque can be represented by pull-in torque or pull-out torque.
Holding torque: The torque required to rotate the output shaft of a motor when the winding is supplied with steady-state DC current.
Inertia: A measured value of an object's inertia in response to acceleration or deceleration. Here, it refers to the inertia of the load that the motor is moving, or the inertia of the motor rotor.
Linear step growth (or step length): The linear stroke produced by the lead screw for each step angle rotation of the rotor.
Maximum temperature rise: determined by the pull-up resistor method. The motor is installed in a well-ventilated environment to keep the current in the coil constant.
Pull-in torque: This is the accelerating torque that must overcome the rotor's inertia, as well as the fixed external load and various frictional torques during acceleration. Therefore, the pull-in torque is usually less than the pull-out torque.
Pull-out torque: The maximum torque that a motor can generate at a constant speed. Because the speed is constant, there is no inertial torque. At the same time, the kinetic energy and inertial load inside the rotor increase the pull-out torque.
Pulse rate: The number of pulses applied to the motor windings per second (PPS). The pulse rate is equal to the motor stepping rate.
Pulses per second (PPS): The number of steps a motor produces in one second (sometimes referred to as "steps per second"). This is determined by the pulse frequency generated by the motor driver.
Speed increase/decrease: A drive technology that increases a given load from its original low step rate to its maximum, and then decreases it back to its original rate, without losing motor steps.
Single-step response: The time required for the motor to complete one full step.
Step: The angle of the rotor when the motor receives one pulse. For linear motors, the step is the linear distance.
Step angle: The rotation produced by the rotor at each step, measured in degrees.
Weekly rotation steps: The total number of steps required for the rotor to rotate 360 degrees.
Torque to inertia ratio: keep the torque divided by the rotor's moment of inertia.
