Hybrid Stepper Motor Electrical Pulse Signal
Hybrid Stepper Motor Electrical pulse signal
The stepping motor is an open-loop control element stepper motor that converts the electrical pulse signal into angular displacement or line displacement. In the case of non-overload, the motor speed and the stop position depend only on the frequency and the number of pulses , Without being affected by the load change, when the stepper driver receives a pulse signal, it drives the stepper motor to set the direction of the roll to a fixed viewpoint, called the "step angle", and its rotation is fixed The point of view step by step work. Can manipulate the number of pulses to manipulate the angular displacement, and then reach the exact positioning of the intention, together with the pulse frequency can be manipulated to control the speed and speed of the motor rolling, and then reach the high-speed intent.
Servo motor, also known as the implementation of the motor, in the automatic control system, as the implementation of components, the received electrical signal into the motor shaft angular displacement or angular velocity output. The inside of the servo motor is a permanent magnet, and the U / V / W three-phase drive of the actuator controls the electromagnetic field. The rotor rotates under the effect of the magnetic field. The motor comes with the encoder response signal to the driver. The driver is based on the response value and the target Value to compare, adjust the rotor rolling point of view. The accuracy of the servo motor depends on the accuracy of the encoder (the number of lines) that the servo motor itself has the function of announcing the pulse, it rotates a point of view, will announce the corresponding number of pulses, so the servo drive and servo motor encoder pulse composition The care, so it is closed-loop control, stepper motor is open-loop control.
Stepper motor and servo motor differences are: 1, the control accuracy is not the same. The more the number of steps and the number of the stepping motor, the higher the accuracy of the servo motor to take the block in the encoder, the more the encoder scale, the higher the accuracy. 2, the control method is not the same; one is open-loop control, one is closed-loop control. 3, low-frequency characteristics are not the same; stepper motor at low speed easy to show low-frequency oscillation appearance, when it is usually in the low-speed operation damping skills or sub-skills to overcome the low-frequency oscillation appearance, the servo motor is very smooth, even at low speed Does not show oscillations. The communication servo system has a resonance function, which can include the lack of mechanical rigidity, and the system has a frequency resolution function (FFT), can detect the resonance point of the machine to facilitate system adjustment. 4, the torque characteristics are not the same; stepper motor output torque will increase with the increase in speed, communication servo motor constant torque output, 5, overload can not the same; stepper motor is usually not overload, and communication motor with Strong overload. 6, the work function is not the same; stepper motor control for the open-loop control, start the frequency is too high or too much load easily lost or stalled appearance, stop the high speed is too easy to show overshoot appearance, communication servo drive system Closed-loop control, the driver can directly on the motor encoder response signal sampling, the internal structure of the azimuth ring and speed loop, usually does not show stepper motor stepping or overshoot appearance, control function is more reliable. 7, the speed echo function is not the same; stepper motor from the stop to speed up the operating speed of hundreds of milliseconds, and communication system to speed up the function is better, usually only a few milliseconds, can be used to require rapid start and stop control occasions.