Berher Lahr品牌伺服马达分为STM, STA, STE三个系列。他们可以用于控制风门、阀门等的开度。在紧凑型的伺服马达内部有马达、齿轮组、控制单元组成。

伺服马达STE系列由模拟信号 （电流或电压) 进行控制。可通过模拟信号设置轴的旋转角度。操作范围，可以自由地在0和90°之间的定义。在界定的工作范围内，可以选择任何的旋转角度。根据版本，设定值可以设置作为一个从0到10V的电压信号或从4至20毫安的电流信号。运行范围的限制也可以由两个极限开关得到保障。新STE数字式已经上市，供电电压为24V。

STA系列伺服马达可以有3个、4个或者5个凸轮。其中两个凸轮用于设置和小限制位置，其他的凸轮用于控制外部设备。这些凸轮都是连续可调的。STA系列伺服马达还可有1或2个继电器。通过这些继电器控制开关控制马达。STA执行器通常用于控制燃气和燃油燃烧器的风门控制。多样的接线方式可以和不同的标准燃烧器连接。STA系列执行器提供顺时针或者逆时针旋转方向的型号。

STM系列伺服马达的构造和STA系列相同。他们的区别只在于有无继电器。STM也同样有顺时针或者逆时针型号提供。

You can use the actuators from Berger Lahr to position flaps, valves or slides with great precision. Inside the compact servo drive housing there is a motor, a gearbox and a control unit. There is a choice of three actuator types to solve your positioning problems: STM, STA and STE.

Actuators of type STE are controlled by analogue signals (current or voltage). The angle of rotation of the shaft can be set via analogue signals. The operating range can be freely defined between 0 and 90×. Any angle of rotation can be selected within the defined operating range. Depending on the version, the setpoint can be set as a voltage from 0 to 10 V or as a current from 4 to 20 mA. The limits of the operating range can also be safeguarded by two limit switches.

Actuators of type STA are available with 3, 4 or 5 cams. Two cams serve to define the limits, and the others are available for controlling external devices. The cams are continuously adjustable. Actuators of type STA are also fitted with 1 or 2 relays. Switching actions for controlling the motor are controlled via these relays. STA actuators are used to move air flaps in oil and gas burners.
Various wiring arrangements are available for connecting to standard burners. Actuators of type STA can be supplied to run clockwise or anti-clockwise.

Actuators of type STM are constructed in the same way as actuators of type STA. They differ in having no relays.
Actuators of type STM are available in clockwise and anti-clockwise versions.