Detailed explanation of the role of permanent magnets in brushless motors
Release time:
2022-12-08
Brushless motors are used in a wide range of applications, and we can find brushless motors in many electronic devices, including medical equipment, printers and automation equipment. In these devices, brushless motors can operate safely. In a brushless motor, the current-carrying conductor is at rest and the permanent magnets are in motion.
Brushless motors are used in a wide range of applications, and we can find brushless motors in many electronic devices, including medical equipment, printers and automation equipment. In these devices, brushless motors can operate safely. In a brushless motor, the current-carrying conductor is at rest and the permanent magnets are in motion.
When the stator coil receives power from the power supply, it becomes an electromagnet and starts generating a uniform magnetic field in the air gap. Although the power supply is DC, the switch generates a trapezoidal AC voltage waveform. The rotor continues to rotate due to the interaction between the electromagnetic stator and the permanent magnet rotor. When the windings are switched to high and low signals, the corresponding windings are energized as north and south poles. The permanent magnet rotor with north and south poles aligns with the stator poles, causing the motor to rotate. Brushless motors cannot run directly on a DC voltage source; they have a rotor with permanent magnets and a stator with windings and an electronic commutator. Typically, Hall effect sensors are used to detect the rotor position and perform a reversal based on the Hall effect sensor input. The motor is driven by a rectangular or trapezoidal voltage stroke and a given rotor position. The voltage stroke is correctly applied between phases so that the angle between the stator and rotor chains remains close to 90° to produce to high torque.
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