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Series Connection and Parallel Connection of 8-wire Motor

Some of STEPPERONLINE's products provide 8 leads, allowing a variety of wiring methods, depending on the speed or torque requirements of the motor.
8-wire stepper motors can be connected in series or parallel with the windings. Figure below shows an 8-wire stepper motor wiring method, with the two windings of each phase connected in series.
This configuration is very similar to a 6-wire connection and also provides the most torque per amp at the expense of high-speed performance.

As shown in the figure below, an 8-wire stepper motor can also be connected in parallel with the windings of each phase. This method enables high-speed operation while requiring greater current to produce rated torque. This type of connection is sometimes called parallel bipolar wiring.

Although the operating principles of each stepper motor are basically the same, you need to understand the differences between each wiring type and choose the appropriate wiring method according to different application scenarios.

The series connection method is suitable for low-speed and high-torque situations. When used in series, the resistance and inductance of the windings increase exponentially. The motor is stable at low speeds, has less noise and heat, and has low requirements on the driver, but high-speed torque losses are large.

The parallel connection method is suitable for occasions with high speed requirements. Two-phase four-phase windings are paralleled, and the resistance and inductance of the windings are reduced exponentially. The motor has good acceleration performance when running, and the high-speed load torque is large, but the motor needs to input twice the rated value. The higher the current, the greater the heat generation, and the requirements for the driver's output capability are correspondingly increased. Setting the drive current of the parallel motor to a larger value will increase the heat generated by the motor and affect the life of the motor.

Updated on: 10/05/2024

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