Which is not delivered to the motor (lost power – see Figure 6).Īs a result, it requires a large heat sink to dissipate the power, Linearly changing the voltage or current. Linear amplifiers adapt the power delivered to the motor by There are typically two different ways to vary the voltage or the current: The role of the amplifier is to vary the supply voltage or theĬurrent, or both, to achieve the desired motion output. Whether for a brush (see Figure 5) or a brushless DC motor (seeįigure 6), the working point (speed and torque) of an application can The motor can be driven in a 6-step trapezoidal commutation which is broadly used (see Figure 3), or it can be operated toĪchieve a more advanced vector control also called as Field Oriented Control (FOC), depending on the sophistication of the Orientation of the magnetic field induced by Switches (typically transistors), usually calledĬonfiguration will allow 3 bidirectional outputs For a 3-phase brushless DC motor, the driver is composed of 6 electronic To the relative position of the rotor vs.
This means the phases of the motors are energized and unenergized in sequence according Unlike brush DC motors (for which the commutation is made mechanically by brushes), brushless DC motors areĮlectronically commutated. This document provides general guidelines when using a PWM driver with a
It is useful to keep in mind some basic physical phenomena toĪvoid unexpected performance issues. Width Modulation) to drive brushless DC motors. Designers of motion systems often face challenges when selecting or developing electronics using PWM (Pulse
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