The difference between stepper motor and synchronous motor

The difference between stepper motor and synchronous motor

The differences between synchronous motors and stepper motors are: different working principles, different characteristics, and different advantages and disadvantages.

1. Different working principles

1. Synchronous motor: Due to the relative cutting motion between the armature winding and the main magnetic field, a three-phase symmetrical alternating potential with periodic changes in magnitude and direction will be induced in the armature winding. AC power can be provided through the lead wire.

2. Stepper motor: The working principle is to rely on the change of air gap magnetic permeability to generate electromagnetic torque.

2. Different characteristics

1. Synchronous motor: When running in steady state, there is a constant relationship between the rotor speed and the grid frequency n═ns═60f/p, ns is called the synchronous speed. If the grid frequency remains unchanged, the speed of the synchronous motor in steady state is constant and has nothing to do with the size of the load.

2. Stepper motor: The accuracy is 3-5% of the step angle, and it is not cumulative. When the stepper motor rotates, the inductance of each phase winding of the motor will form a reverse electromotive force; the higher the frequency, the greater the reverse electromotive force. Under its action, the phase current of the motor decreases as the frequency (or speed) increases, resulting in a decrease in torque.

3. Different advantages and disadvantages

1. Synchronous motor: high precision, but complex manufacturing, high cost, and relatively difficult maintenance.

2. Stepper motor: Although it has a slow response, it is easy to install and use, and is cheap.

The difference between stepper motor and synchronous motor

The differences between synchronous motors and stepper motors are: different working principles, different characteristics, and different advantages and disadvantages.

1. Different working principles

1. Synchronous motor: Due to the relative cutting motion between the armature winding and the main magnetic field, a three-phase symmetrical alternating potential with periodic changes in magnitude and direction will be induced in the armature winding. AC power can be provided through the lead wire.

2. Stepper motor: The working principle is to rely on the change of air gap magnetic permeability to generate electromagnetic torque.

2. Different characteristics

1. Synchronous motor: When running in steady state, there is a constant relationship between the rotor speed and the grid frequency n═ns═60f/p, ns is called the synchronous speed. If the grid frequency remains unchanged, the speed of the synchronous motor in steady state is constant and has nothing to do with the size of the load.

2. Stepper motor: The accuracy is 3-5% of the step angle, and it is not cumulative. When the stepper motor rotates, the inductance of each phase winding of the motor will form a reverse electromotive force; the higher the frequency, the greater the reverse electromotive force. Under its action, the phase current of the motor decreases as the frequency (or speed) increases, resulting in a decrease in torque.

3. Different advantages and disadvantages

1. Synchronous motor: high precision, but complex manufacturing, high cost, and relatively difficult maintenance.

2. Stepper motor: Although it has a slow response, it is easy to install and use, and is cheap.