Closed Loop Current Control Stepper Motor

Under normal circumstances the operation of the motor is monitored and control is applied using open loop like a standard stepper motor.

Closed loop current control stepper motor. The rotor position detection sensor monitors the rotation speed and amount. Common names for this architecture include closed loop stepper control or servo stepper. Small form factor efficient and protected power stag with fault feedback advanced digital processing for smooth and accurate closed loop control accurate angle and current feedback sense for high resolution micro stepping. Closed loop stepper drive systems often require.

Closed loop stepper systems supply the motor with just enough current to control the load and this results in much less audible noise than open loop setups. To produce the test results shown in the plot of acoustic noise accompanying this article the acoustic noise of each system is measured in a soundproof chamber. The most advanced closed loop stepper control method is to operate the motor as a two phase brushless bldc motor. If an error occurs between the command and motor position due to a load or the like the system immediately switches to closed loop control like a servo motor.

Note that many stepper motors have two phases offset by 90 whereas brushless dc motors have three phases offset by 120 this method is referred to as servo stepper or closed loop stepper control.