A motor controller includes memory, and processing circuitry that controls a motor based on a position command and based on a position detection value corresponding to a detected position of the motor, calculates a tolerance position error in a successive manner based on the position command and based on a control parameter used to control the motor, calculates a position error maximum threshold that depends on the tolerance position error, detects an abnormality based on the position error maximum threshold, and triggers an indication when the abnormality is detected.

A motor controller includes memory, and processing circuitry that controls a motor based on a position command and based on a position detection value corresponding to a detected position of the motor, calculates a tolerance position error in a successive manner based on the position command and based on a control parameter used to control the motor, calculates a position error maximum threshold that depends on the tolerance position error, detects an abnormality based on the position error maximum threshold, and triggers an indication when the abnormality is detected.

A motor control device for controlling driving of a motor based on position commands input from a host control device includes an offset value memory including first circuitry which stores offset values corresponding to predetermined values of position commands, respectively, and a drive controller including second circuitry which acquires, from the offset value memory, one of the offset values corresponding to an input position command among the position commands, and control driving of a motor based on an offset position command obtained by adding the one of the offset values to or subtracting the one of the offset values from the input position command.

A system for correlating an input signal with an operating state of a motor includes a substrate which is either integral to an encoder or mounted on the motor. The substrate has a first input connected to a sensor proximate to the motor to receive a first signal from the sensor. The substrate also includes a second input to receive a position feedback signal from the encoder. A control circuit is operative to detect a change in state of the first signal and to correlate at least one additional signal to the change in state of the first signal. A data packet including the first signal and the at least one additional signal correlated at the change in state is generated. A communication interface is operative to transmit the data packet from the control circuit to at least one additional controller external from the motor.