However, for direct current (DC) motors, the speed can be changed and controlled by changing the voltage, so as to speed up or slow down the working speed according to the needs of the application. There are some simple methods to adjust the speed of AC motor (for example, standard household fan that can provide three speed options), but these methods have limited application scope and are difficult to transfer to more complex systems. This is because the AC motor only outputs constant speed and cannot adapt to the changes of working conditions.
AC motors are the simplest induction motors, but they cause a lot of energy waste. Although this figure may not be so high in other countries, reducing motor energy consumption in electronic systems has become a priority issue in the world.įor more than a century, the traditional AC motor has been widely used. The energy consumption of these motors is very huge: research shows that in China alone, the energy consumed by motors accounts for 60% to 70% of the total industrial energy consumption, and the energy consumed by fans and pumps accounts for nearly a quarter of the overall power consumption in China. It is widely used in many applications, such as driving fans, pumps and other mechanical equipment. Motor is also an important part in the industrial field. Solution of FOC control technology for brushless DC motorįrom the perspective of energy consumption, the transition of consumer electronics and industrial equipment from traditional AC motor to smaller and more efficient BLDC motor is of great significance, but the complexity of designing BLDC control algorithm prevents engineers from realizing this transition.įrom small vibrating motors in mobile phones to more complex motors used in household washing machines and air conditioners, motors have become daily devices in the field of consumption. When the motor speed is 500 rpm, the output frequency of terminal speed is 200Hz. For example: 4-pole motor, 24 pulses per revolution. Pulses per revolution = 6 × Motor pole pairs, speed frequency (Hz) = pulses per revolution × Speed (RPM) ÷ 60.
#FORWARD AND REVERSE MOTOR DRIVER#
The internal resistance of terminal “dir” is pulled up to + 12, which can be used with passive contact switch or PLC and other control units with open collector When “dir” and terminal “com” are not connected, the motor runs clockwise (facing the motor shaft), otherwise, it runs counterclockwise In order to avoid damage to the DC brushless driver, when changing the motor direction, stop the motor before changing the direction, so as to avoid controlling the running direction when the motor is running.ĭC brushless driver provides users with pulse signal proportional to motor speed through terminal speed ~ com. The running direction of the motor can be controlled by controlling the on and off of terminal “dir” and terminal “com”. In order to make the forward and reverse rotation of the motor produce the maximum average electromagnetic torque to ensure symmetrical operation, the mutual position relationship and correct logic relationship between the rotor position sensor and the main magnetic pole of the rotor and each phase winding of the stator must be designed. Usually, the forward and reverse rotation of the motor is realized by changing the logic relationship of the inverter switch to change the conduction sequence of each phase of the armature winding.
#FORWARD AND REVERSE MOTOR HOW TO#
So how to realize the forward and reverse rotation of Brushless DC motor? See below. We know that brushless DC motor requires not only good starting and regulating characteristics, but also forward and reverse rotation in many occasions. How to control forward and reverse rotation of Brushless DC motorĭC motor has the characteristics of fast response, large starting torque, from zero speed to rated speed, and can provide rated torque.
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