Contents
How are feedback sensors used in a motor control system?
Feedback sensors serve a critical role in a motor control system. These sensors provide information on the current, position, speed and direction of a rotating motor. In addition, the sensors improve the reliability of the motor by detecting fault conditions that may damage the motor.
How does an over-top current sense circuit work?
Over-The-Top Current Sense. This circuit takes advantage of the microampere supply current and rail-to-rail input of the LT1494. The circuit is simple because the supply draw is essentially equal to the load current developed through R A. This supply current is simply passed through R B to form an output voltage that is appropriately amplified.
Where does the sense of current take place?
Current sensed in the supply path of the power connection to the monitored load. Current generally flows in just one direction (unidirectional). Any switching is performed on the load-side of monitor. Figure 2. High Side Current Sensing. Load not activated by accidental short at power connection High load current caused by short is detected
How does high side current sense and fuse monitor work?
High Side Current Sense and Fuse Monitor. This is a low voltage, ultrahigh precision monitor featuring a zero-drift instrumentation amplifier (IA) that provides rail-to-rail inputs and outputs. Voltage gain is set by the feedback resistors.
How is current measured in motion control systems?
This trend can be mainly found in the automotive and industrial markets. The current tran s ducer is used to measure the current without interrupting the circuit, thus making the measurement very safe. The current transducer uses the magnetic field to determine the current of the conductor.
What should be the accuracy of speed control?
In case of motor control based on an encoder feedback it should be possible to achieve a speed accuracy of 1 rpm or even better. Anyway it is important to understand which parameters might have the main impact for the concrete application and may even be optimized easily first of all.
Which is danisense current sensor for motion control systems?
Danisense’s DS200 works with currents up to 200 A at a ratio of 1:500, while the DS600 can be used up to 600 A (figure 2). National Instrument used Danisense current sensor solutions in tests with its RM-26999 4-channel power measurements conditioner.