Sawyer Motors最初以布鲁斯·索耶（Bruce Sawyer）在1968年获得专利的设计，是一种planar motor, and are sometimes referred to as “dual-axis linear stepper motors” since they use stepper motor technology and the moving part can travel in both the X and Y directions.
像其他平面电动机设计一样，锯耶电动机由一个移动零件组成（通常称为forcer）和一个固定部分，称为压板。（Sawyer Motors的单轴版本也存在，但是这些设计本质上是single-axis linear stepper motors.)
该柱通常由铝制成，并包含四个线圈组件，每个线圈组件由电动机绕组（线圈）和一个永久磁铁组成。线圈组件可以是2相或4期, with 4-phase designs providing approximately twice the resolution as 2-phase designs. The active (bottom) surface of the forcer is slotted to form teeth, which concentrate the magnetic flux that’s created when current is applied to the coils.
将两个线圈组件串联安装，以在X方向上提供运动，而其他两个线圈组件将与前两个正交安装，从而在Y方向上提供运动。该前孔还包含一个空气轴承系统，以支撑前面的载荷和施加的负载。
Image credit: H2W Technologies
压板通常是一个地面钢板，也被插入形成牙齿。结果是华夫饼干的结构，牙齿之间的空间充满了环氧树脂。板条用作空气轴承表面，而固定器和压板之间的吸引力可提供磁性在空气轴承上预紧system.
Since they use stepper motor technology, Sawyer motors are designed to run as open-loop systems, but closed-loop operation can be achieved with the addition of two encoder positioning sensors — one for each direction of movement — to detect lost steps. (The position sensor acts like an incremental encoder, but rather than using a linear scale, it works in conjunction with the platen to determine position.) Although full-step operation is possible, most dual-axis linear stepper motors are operated with麦克风rosteppingcontrol for high resolution.
As with other planar motor designs, Sawyer motors can use multiple, independent forcers on the same platen for complex, coordinated motions. And due to the construction of the forcer, these designs can also provide rotational (theta) motion over several degrees. Sawyer motors can also be wall-mounted or inverted (mounted upside-down).
The main benefits of Sawyer motors are their relatively low cost (even with closed-loop operation) and ease of use, with no servo tuning required. Despite their relatively simplicity, Sawyer motors operated with microstepping drives are common in high-precision semiconductor processing applications, such as wafer steppers, wafer probers (for testing), and wire bonders. These planar stepper motor designs are also used in assembly and pick and place applications in drug discovery and MEMS industries.
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