This is absolutely not allowed. The small size of a permanent magnet motor is due to its inherent magnetic properties. Another key feature is its high starting torque, which comes from the ability of the servo actuator to accurately detect the rotor's magnetic pole position. This allows the stator poles to be aligned orthogonally, maximizing the output torque. To achieve this positioning, the servo system relies on a sensor to provide feedback. Additionally, servo motors have a much lower stator resistance compared to asynchronous motors, typically in the milliohm range. When a power frequency supply is applied directly to a permanent magnet motor, the current can be dangerously high, especially if the motor is not properly aligned with the magnetic poles. In an open-loop configuration, where the motor isn't synchronized with the magnetic field, the torque will be low, and the motor may struggle to start, potentially leading to overheating or failure. The purpose of this discussion is to highlight the differences between Siemens asynchronous and synchronous motors. However, it’s worth noting that servo motors can also operate in open-loop mode under certain conditions, such as when using a drive like the MM440. This topic has been explored in detail elsewhere, and here we’re focusing on the core principles. In encoderless servo control, the system initially operates in open-loop mode before transitioning to closed-loop operation for precise control. This method ensures smooth and accurate motion without the need for external encoders. Asynchronous start methods involve running the motor in asynchronous mode first, without excitation. Once the motor reaches a speed close to synchronous, the excitation current is applied to pull it into synchronization. Alternatively, in a synchronous inverter start, the excitation current is applied to the rotor first, and then the frequency of the stator supply is gradually increased by the frequency converter. This helps establish a stable magnetic field that pulls the rotor into synchronization during startup.
Three-phase Permanent Magnet Synchronous Motor
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