The two-phase stepping motor has only two windings and four lead wires on the stator. Generally, the step angle is 1.8 degrees and the half step angle is 0.9 degrees. The driver only needs to control the current switching of the two-phase winding. Yes, the 4-phase stepper motor has four windings on the stator, 8 lead wires, the whole step is O.9 degrees, and the half step is 0.45 degrees. The driver needs to control 4 windings, the complexity and cost of the circuit. Will increase. Therefore, a general two-phase stepping motor is equipped with a two-phase driver, and when a smaller step angle is required, a subdivision driver can be used.
Some companies refer to two-phase 4-wire and four-phase 8-wire stepper motors as two-phase stepper motors, and the drive seems to have only two phases. This is because the four-phase windings become two-phase windings after being connected in parallel or in series, and the four-phase motor becomes a two-phase motor, but the series or parallel connection will double the resistance and inductance of the motor winding, and the motor running performance will also be There are significant changes. Generally speaking, when four phases are connected in parallel to form two phases, the motor has better acceleration performance, and the high-speed torque is kept well, but the motor current will be twice that of the four-phase, the heat is large, and the output capacity of the driver is correspondingly required. When the four phases are connected in series to form two phases, the motor has better low speed stability, less noise and heat generation, and the driver requirements are not high but the high speed torque loss is large. Some companies' drives are all two-phase design, and the four-phase stepper motor must be switched into two phases to be used. Therefore, these companies often have to ask customers if they want the motors to be connected in series or in parallel. In the past, when the 8-wire stepper motor was strictly marked as four-phase, the customer would naturally think that the four-phase motor and the two-phase driver did not match, so many companies simply labeled the four-phase stepper motor and the two-phase stepper motor as two phases. . "The truth of the two-phase stepper motor and the four-phase stepper motor is essentially one thing."
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