The DECV (Digital Electronically Commutated Voltage-regulated) 50/5 is a compact, digital, four-quadrant speed controller from maxon motor that can be used with brushless dc motors of up to 250W. The unit takes its signals directly from the drive's internal Hall sensors, which avoids the extra expense and complication of an encoder.
There are two set-values for speed regulation and current restriction, the required speed range and speed ramp being pre-selected by the flick of a DIP switch. The device handles 5A in continuous operation and up to 10A intermittently to allow for overloading. Both motor speed and current are available as analogue outputs.
Auxiliary devices such as chokes are not required to protect the motor from overheating. Instead, this is achieved via internal control of the link circuit voltage, which reduces current ripple. The controller also protects against excess current and voltage, thermal overload and short-circuiting of the motor cables.