Issue link: https://resources.mouser.com/i/1525523
| 22 motor design. Still, the most popular way of delivering the PWM signal is through a three-phase, two-level configuration Figure 2. In this case, the inverter bridge consists of six transistors, each with a flyback diode across the transistor to protect it from sudden voltage spikes that occur when the supply current is reduced quickly from an inductive load, such as a motor. The six transistors are controlled independently by six gate drivers and are fully turned on or fully turned off at a high frequency. They act as quasi-ideal switches to modulate the voltage to the stator electromagnets, recreating the PWM signal to control the motor's speed. BDLC motors are controlled in a similar way, but no initial rectification is required as the input voltage is already DC. AC/DC Rectifier Figure 1: The inverter's place in the overall motor control schematic. (Source: Analog Devices) AC Motor Power Inverter isolation barrier From controller DC Bus V dc Gate Drive U V W Tº Figure 2: Inverter stage driving a three-phase motor. (Source: Analog Devices; redrawn by Mouser Electronics)