Transcription of Fundamentals of motor control - STMicroelectronics
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Fundamentals of motor control - STMicroelectronics
Fundamentals of motor controlIndustrial & Power conversion TrainingAgenda1 Basic principle3 Three-phase brushless DC motor2 Brush DC motor4 Bipolar stepper motor2 Basic principleAnelectric motor isa device converting electrical energy into mechanical energy (generally a torque).This conversion is usually obtained through the generation of a magnetic field by means of a current flowing into one or more an electric motor isMechanicalenergyMotorElectricalenergy4 Rotor and stator magnetic fieldsThe rotation is obtained thanks to the attractive force between two magnetic fields: One field is located on the rotor (the moving part). The second magnetic field is located on the stator (the body of the motor ).BstaBrot RotationUsually one of the two is generated by a permanent magnet while the other one is generated through an electromagnet (solenoid).5 Magnetic field generationThe relation between electrical energy (current) and magnetic field generated by a solenoid (coil) is obtained through the following formula: = BIph6 Torque and load angleThe output torque of an electrical motor depends on the intensity of the rotor and stator magnetic fields and on their phase relation: sin( ) ( )The angle between the two magnetic field is named load maximum output torque, and then the maximum efficiency, is obtained when the load angle is 90.
An electric motor is a device converting electrical energy into mechanical energy (generally a ... B sta B rot θ Rotation Usually one of the two is generated by a permanent magnet while the other one is generated through an ... series which stores energy in the form of current. Applying a voltage to the load it is possible to change the amount ...
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