A method for driving a DC motor
A technology of DC motor and driving method, applied in the direction of DC motor speed/torque control, electronically commutated motor control, electrical components, etc., can solve the problems of complicated installation, high cost, and application promotion restrictions, and achieve simplified installation and structure , improve performance and reduce cost
Active Publication Date: 2015-08-05
中山市特新电子科技有限公司
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Problems solved by technology
[0003] Brushless DC motors are divided into two categories with position sensors and without position sensors. Brushless DC motors with position sensors generally use Hall sensors and photoelectric sensors as motor rotor position signal detection. The driver changes the stator rotating magnetic field according to the motor rotor position signal. The frequency and current of the rotor can change the speed and torque of the rotor. The brushless DC motor system with a position sensor is relatively easy to drive the stator rotating magnetic field with a sine wave due to the condition of an accurate rotor position signal, so as to achieve low noise vibration and high performance. DC brushless motor system, because it is equipped with a position sensor, the installation is complicated, the cost is high, and the application and promotion are limited to a certain extent
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[0027] A further detailed description will be made below in conjunction with the accompanying drawings and embodiments of the present invention:
[0028] Such as figure 1 As shown, HA, HB, and HC are signal timings of position sensors, which are applied to drive systems with position sensors; UA, UB, and UC three-phase drive output voltage waveforms; 0°-360° waveforms are without position sensors After the system is analyzed by the terminal voltage software, the counter electromotive force produced inside the controller MCU is zero-crossing sequence. In the figure, Z is the zero-crossing point and C is the commutation control point.
[0029] The control sequence of this system is three-phase twelve-step, in which the driving of the half-bridge output only works in two states of complementary PWM and floating; the driving voltage of the half-bridge output takes the PWM effective voltage with a duty ratio of 50:50 as the midpoint zero Voltage (1 / 2U dc ), that is, within a peri...
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The invention discloses a driving method for a DC motor. According to the method, a counter electromotive force of a stator coil is clamped at the middle point zero voltage before a phase is suspended in the air, so as to effectively restrain noises and vibrations of the counter electromotive force; and meanwhile, induced voltage generated by rotations of the clamped phase in the motor is used for detecting the zero crossing point of a rotor. Therefore, the contradiction that position detecting of a non-position sensor driving system can not be carried out without the suspended phase, while the noises and the vibration are inevitably caused by the counter electromotive force accompanying the suspended phase is solved; and the performance of the motor is effectively promoted.
Description
[technical field] [0001] The invention relates to a driving method of a DC motor. [Background technique] [0002] The motor itself of the brushless DC motor is an electromechanical energy conversion part. In addition to the two parts of the motor armature and permanent magnet excitation, it also has a position sensor. The motor itself is the core of the brushless DC motor. It is not only related to performance indicators, noise and vibration, reliability and service life, but also involves manufacturing costs and product costs. Due to the permanent magnetic field, the DC brushless motor gets rid of the traditional design and structure of the general DC motor, meets the requirements of various application markets, and develops towards the direction of copper saving, material saving and simple manufacturing. [0003] Brushless DC motors are divided into two categories with position sensors and without position sensors. Brushless DC motors with position sensors generally use H...
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IPC IPC(8): H02P7/282H02P6/18H02P6/182
Inventor 陈小尘
Owner 中山市特新电子科技有限公司