The shaded-pole motor belongs to the group of asynchronous motors. However, the shaded-pole motor only runs in one direction of rotation and its efficiency is very low. On the other hand, the motor is very inexpensive and runs very quietly.
In 1956 Hilfiker & Co not only developed a standard shaded-pole motor. Due to the high demand, a suitable motor brake was also built, which was significantly cheaper than that of other competitors. The HILBA dual shaded-pole motor was also the answer to the need for motors that could be operated in both directions of rotation.
The robustness, high durability and low price helped the product to an enormous market success. Between 1956 and 1961, over 10,000 units of the basic model alone were sold.