Applied Motion Products (USA) announced the release of a training/tutorial video regarding the use of encoder feedback with (also CANopen-capable) step motor systems. The video demonstrates three ways of how to use it and how to set it up.
BY ADDING AN ENCODER TO A STEP MOTOR SYSTEM, the drive may monitor the motor’s data closing the feedback loop. The first use of encoder feedback is for position and velocity verification. A PC or PLC can monitor position and velocity by connecting to one of our ST or STAC drives via CANopen, EIA-232, EIA-485, Ethernet or EtherNet/IP.
The second use of encoder feedback is the immediate detection and reporting of stalls in the event that the motor is overloaded. The video shows how the driver can be configured to signal other equipment by the state change of a digital output or by providing this information over the communication interface.
The third use of encoder feedback uses the encoder for real time monitoring of the torque producing lead/lag angle, the angular difference between the magnetic fields of the stator and rotor. Company’s drives may use this information to precisely control the motor’s torque and prevent unexpected motor stalls. Stall prevention is enabled by checking the “Stall Prevention” box in manufacturer’s free-of-charge ST Configurator setup software.
Additionally it is possible to use the encoder index to achieve precise homing, accurate to 0,09°. Encoders may be purchased with company’s motors ranging from NEMA size 11 to 34. The encoder comes pre-assembled to the rear shaft of the step motor and connects via cable to the encoder feedback port available on drives including the DC-powered ST5 and ST10 and the AC-powered STAC5 and STAC6. Internal encoders are also available on the STM17, STM23 and STM24 integrated drives and support the same features as the ST and STAC products.
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