What Is The Difference Between Stepper Motors And Ordinary Motors

April 25, 2024

The ordinary electric motor is a device that converts electrical energy into mechanical energy. It uses an energized coil to generate a rotating magnetic field and acts on the rotor to form a magneto-electric rotating torque. The ordinary electric motor is mainly composed of a stator and a rotor. The direction of the energized wire's forced movement in the magnetic field is related to the direction of the current and the direction of the magnetic field lines (magnetic field direction). The working principle of the motor is the force exerted by the magnetic field on the current, causing the motor to rotate. According to the different power sources used, ordinary electric motors are divided into DC motors and AC motors. Most motors in the power system are AC motors, which can be synchronous motors or asynchronous motors (the stator magnetic field speed of the motor does not maintain the same speed as the rotor rotation speed). The ordinary electric motors have the advantages of high efficiency, reliability, energy saving and low maintenance costs, so they are widely used in industry, automobiles, household appliances and other fields.

The stepper motor is an open-loop control element that converts electrical pulse signals into angular displacement or linear displacement. It is an induction motor whose rotor has multiple iron cores arranged in an annular shape. The frequency and number of pulses of the stator current can be adjusted. Each time a pulse signal is given, the motor rotates through a step angle. There are two types of stepper motors: reactive and permanent magnet. Among them, permanent magnet stepper motors are more widely used. When the stepper motor is not overloaded, the motor's speed and stopping position only depend on the frequency and number of pulses of the pulse signal and are not affected by load changes. Stepper motors can achieve precise positioning and speed control through controllers, so they are widely used in various situations that require precise control of position and speed.

stepper motors

What is the difference between stepper motors and ordinary electric motors? 

Motors are very important equipment in modern industry and technology, and stepper motors and ordinary motors are two common types of motors. There are some obvious differences between them, mainly reflected in the following aspects.

Control Method

The stepper motor controls the angular displacement by controlling the number of pulses, so its control accuracy is very high and it can achieve precise positioning and speed control. Ordinary motors usually control the speed by adjusting the size of the current, and their control accuracy is relatively low.


The structure of the stepper motor is relatively simple, mainly including a rotor and a stator. The stator has multiple poles, and the rotor rotates through interaction with the stator. Ordinary motors usually include components such as stators, rotors, and bearings, and their structures are relatively complex.

Speed Regulating Performance

The stepper motor can realize step less speed regulation, has a wide speed regulation range, and the speed regulation performance is stable and reliable. Ordinary motors usually control the speed by adjusting the size of the current. The speed regulation range is small and the speed regulation performance is relatively poor.

Operating Noise

The running noise of stepper motors is relatively small because it has no contact mechanical structure and does not generate noise such as friction and vibration. Ordinary motors will produce certain friction and vibration noise due to their contact mechanical structure.


The maintenance of stepper motors is relatively simple because it has no contact mechanical structure and will not suffer from wear and failure. Ordinary motors require regular maintenance, such as bearing replacement and armature cleaning.


Stepper motors are widely used in many fields, such as industrial automation, automobiles, household appliances, etc.

In the field of industrial automation, stepper motors are used in various mechanical equipment, such as CNC machine tools, plastic machines, textile machines, etc. Through the controller, the stepper motor can accurately control the movement, attitude and precise position of the robot, improving production efficiency and product quality. In the automotive field, stepper motors are used for engine control, temperature control, air conditioning control, etc. For example, stepper motors control the motor of a car engine to achieve precise ignition timing and air-fuel ratio adjustment, thereby improving the car's power and economic performance.


In the field of household appliances, stepper motors are used in refrigerator door locks, navigation of sweeping robots, and TV channel adjustment on televisions. Through the controller, stepper motors can accurately control various actions of household appliances, improving intelligence and convenience. In addition, stepper motors are also widely used in medical equipment, electronic equipment, textile machinery and other fields. For example, in medical equipment, CT scanners require stepper motors to control the travel of the X-axis and Y-axis to ensure that the person being examined can be examined safely and accurately. In textile machinery, stepper motors can control the mechanical arms of textile robots to achieve precise textile production. Stepper motors are widely used and can play an important role in situations where precise control of position and speed is required.

smooth stepper motors

To sum up, there are certain differences between stepper motors and ordinary motors in terms of control methods, structures, speed regulation performance, operating noise and maintenance. The choice of which motor to use needs to be determined based on the actual application scenario and usage requirements. Smooth is a professional stepper motor supplier and manufacturer in China, with more than 10 years of manufacturing and exporting experience. If you are looking for a mature stepper motor manufacturer, please contact us!

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