How does the step motor reset
So we're going to go straight to zero. This method is to point to install a stop at zero block, and then through the stepper motor to drive big enough in the direction of the zero point of view, when stepping motor to zero, is blocked by block, motor stop position is zero. This motor zero method is simple, but when the motor is blocked by block is still driving a stepper motor to perform an action of zero, so will not only harm the stepping motor and actuator, also will produce severe shaking and large noise.
The electric motor sends a set of driver signals to the motor. (it takes a very short time to complete a set of driver signals, and it's almost as if the electricity is reset.)
By adjusting the air ratio of the pulse width modulation signal, the amplitude is constructed by a sine drive current that is attenuated by a certain pattern. At a certain phase difference with the current in the stepping motor's winding, can give in motor drive in micro step way, and the torque attenuation by the desired pattern. This method is applied to the stepper motor to zero process, can make the motor at a constant speed and torque gradually weakened the way back to zero, effectively protect the motor and drive gear. This method does not require hardware circuit, but can make the motor return to zero reliability, the motor runs smoothly. So there is a wide range of applications
Special motor drive chips with stop testing are adopted. When the machine is stopped, the chip will be able to locate the motor in a suspended state to determine the zero position. However, this method is not widely used, and it has certain requirements for the current phase of each winding of the stepping motor, and this method cannot be used in the microstep mode.
Sensor method. The method to install at zero hall switch, photoelectric diode, such as position sensor, when the stepper motor back to zero, the sensor signal is given, the control circuit detects the signal, the motor stops in the zero position. This method is accurate and reliable, but increases the complexity of the circuit and has certain requirements for installation.
