What are the differences between stepper motor and geared motor?

Stepper motor is the electrical pulse signal into angular displacement or linear displacement of the open-loop control element stepper motor parts. In the case of non-overload, the motor speed, stop position depends only on the pulse signal frequency and the number of pulses, and not affected by load changes, when the stepper drive receives a pulse signal, it drives the stepper motor press The set direction is rotated by a fixed angle, called the “step angle,” and its rotation is carried out step by step at a fixed angle. By controlling the pulse number to control the angular displacement, so as to achieve the purpose of accurate positioning; the same time by controlling the pulse frequency to control the motor speed and acceleration of rotation, so as to achieve the purpose of speed.
The gear motor is made up of reducer (gear box) + motor, the motor provides high speed, but the torque is small, the inertia is big; the function of reducer is to reduce the speed, increase the torque, reduce the inertia, has reached the ideal Speed ​​and torque; such as the common electric curtains, electric rolling gate, have adopted a geared motor, slow speed, large torque.
Simple to say that the stepper motor can be fixed-speed control, for example, walk the table 1 meters, the speed can be set free, common application cases are, milling machine table stepper motor. The difference between the two is the stepper motor can be fixed speed, timing (want to go long, turn more quickly can be set); reducer speed is determined by the deceleration ratio, can not adjust the speed of the speed; but the stepper motor torque Small, slow down motor torque.
Stepper motor, you can fixed-length constant speed control, for example, walk the table 1 meter, speed 500R / MIN, but the gear motor can not, if it is three-phase asynchronous gear motor, which gear box to slow down, but the speed is not Good tune, speed control through the inverter, but also can not say that I want to go to how many trips on how much it wants to achieve the stepper motor that function (fixed-length speed control), with the inverter and encoder. In addition the deceleration of motor power, the general power of stepper motors are not how big, stepping speed reducer can be large.
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