Dc Motor Drivers; Figure 6.7-4 - Motor Pulse With High Voltage Chopper; Figure 6.7-5 - Dc Motor Voltage Amplifier - Newport ESP6000 User Manual

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Figure 6.7-4 — Motor Pulse with High Voltage Chopper
Once the desired current value is reached, a chopper circuit activates to
keep the current close to the nominal value.

6.7.2 DC Motor Drivers

There are three major categories of DC motor drivers. The simplest one is a
voltage amplifier (Figure 6.7-5).
control signal
Figure 6.7-5 — DC Motor Voltage Amplifier
The driver amplifies the standard ±10V control signal to cover the motor's
nominal voltage range while also supplying the motor's nominal current.
This type of driver is used mostly in low-cost applications where following
error is not a great concern. The controller does all the work in trying to
minimize the following error but load variations make this task very difficult.
The second type of DC motor driver is the current driver, also called a
torque driver (Figure 6.7-6).
nominal current
Phase ON
±10V
Vn
M
E