Figure 1 illustrates the difference between open- and closed-loop speed control as different fans are driven to a target speed from the OFF condition.

In motion control applications, you frequently hear all sorts of loops -- open, closed, current, torque, speed, voltage, and so on. Here, we define and explain these terms.

Beijing, China—Andigilog has expanded its intelligent PC fan driver family with two products, one of which it claims is the first device to provide closed-loop speed control around fan speed and ...

Andigilog, the fabless semiconductor company providing intelligent thermal management solutions, has expanded its product line with two new products. The aMC8520 is the first device in the industry to ...

This makes open-loop control dynamic, unlike V/f control. In addition to torque limits, open-loop control has a quicker speed response of 10 Hz, letting it handle more dynamic responses to impact ...

All speed control at this stage is open loop. The system changes to sensorless control, with the current limit set for normal operation, as soon as the motor is rotating fast enough to generate a back ...