Brushless DC motors of flat design with a low profile body Speed constant: 374rpm/V Available in 2 versions: Standard, stock no. 420-4997, or with Hall effect sensors, stock nos. 420-5192 and 495-063 Standard version is suitable for conventional voltage dependent applications Hall effect versions ideal for feedback speed controlled applications Suitable controller for the standard version Maxon controller AECS35-3 (stock no. 418-4051) Suitable controller for the Hall effect versions Maxon controller DEC50-5 (stock no. 418-4045) To facilitate connection of the motor to the controller, the use of a motor connection unit is recommended Utilise the 4 way unit (stock no. 420-5091) for the standard motor 420-4997 and the 8 way unit (stock no. 420-5108) for motor (stock no. 420-5192)