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The length of the magnets in PMDC motors (Permanent Magnet DC motors) can vary widely depending on the specific application, design, and power requirements of the motor. Generally, magnets can range from just a few millimeters in length for small, precision applications, up to several centimeters for larger, more powerful motors. For instance, in small electronic devices, the magnets might be less than 10 mm, while in automotive applications (such as power windows or electric power steering systems), the magnets could be several tens of millimeters long. Ultimately, the specific dimensions are determined by the requirements of the application, such as torque, speed, and physical size constraints.