Stepping motors are known as cost-effective, robust drives. They are used in a whole range of machines and devices and perform all kinds of tasks from simple point-to-point positioning in handling and automation systems, fast, short-term movements in the textile industry to high precision synchronized movements in printing applications. Stepping motors excel with a simple, sturdy construction (usually without feedback systems), they can be installed quickly and easily without requiring the user to set up complex control parameters. And they are, to a considerable degree, independent of the load and the inert mass.
2-phase stepping motors are usually employed for simple applications, while the 5-phase stepping motor has become the reliable solution for more demanding tasks. The advantages of the 5-phase stepping motor include the high natural resolution of 500 or 1.000 steps per revolution, its low noise and low resonance operation. Its low detent torque makes it ideal for micro-step operation. On the other hand, the considerable wiring and switching technology required for the 5-phase stepping motor can adversely affects the system costs.
The increasing demands on a state-of-the-art stepping motor system primarily focus on reduced noise development and increased power of the drive. At the same time, the cost factor plays an important role. As it becomes possible to develop circuits with ever higher degrees of of integration, BERGER LAHR decided to face the challenge and break new ground in the area of stepping motor technology. By means of using a 3-phase sine control, it is possible to reduce the number of phase windings. The number of steps per revolution is only determioned by the number of pole pairs of the motor and by the electronic system. For decades, the 3-phase technology has been used as a cost-effective system for generating rotating fields in the area of electronic power engineering. The advantages are self-evident. Therefore, the development of a 3-phase stepping motor system is a natural consequence. In addition to the new features, the system was supposed to meet all requirements known from the 5-phase stepping motor system at significantly reduced costs. This involved considerable development efforts, both in terms of the motor itself and in terms of the electronic system.
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