The three-phase hybrid stepping motor operates based on AC servo principles. It combines the characteristics of a standard stepper motor, offering high torque at a 50% speed ratio and exceptional stability at low speeds with minimal resonance. The compatible driver features a single-phase 220V/50Hz input, three-phase sinusoidal output, adjustable current, and ten subdivisions with a half-flow rated value of 60%. It supports flexible control modes such as "pulse + direction" and "positive rotary pulse + reverse pulse." Additionally, it includes overheat protection, making it user-friendly and reliable for various applications.
However, this motor can interfere with highly sensitive receiver systems due to its driver output—3A current and 325V voltage—and the lack of magnetic shielding in its aluminum, titanium, or magnesium alloy casing. This interference can disrupt the power supply, leading to communication issues between the control system's MCU and the host computer. In severe cases, it may even cause the MCU to crash, creating significant usability problems. Therefore, addressing this interference is crucial for smooth operation.
To mitigate these issues, several measures were implemented in the system: first, reducing AC power supply pollution by installing a power filter with good contact. Second, applying the "single-point grounding" principle, isolating the power filter ground from the drive PE ground (connected to the chassis bottom plate), and shorting the control pulse PULSE- and direction pulse DIR- lines. The motor ground wire and the cable between the driver and motor are also connected to the chassis wall's grounding post to prevent cross-interference.
For example, in a dual-axis drive system where two drives are mounted within the same chassis, the layout was carefully designed. The positions of the drives were arranged so that the control lines and power cables (LN motor drive lines, UVW) were kept as short as possible. One driver was positioned facing forward, while the other faced backward, optimizing the structure for minimal interference. Alternatively, the power cord could be routed outside the chassis to further reduce internal noise.
Shielded cables were also used to protect against external interference, ensuring cleaner signal transmission and improved system performance. These steps significantly reduced electromagnetic interference, allowing the system to operate more reliably and efficiently.
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