In the design of motion control system based on step motor in the process of optimization, the engineer must consider cost, performance, efficiency, and unexpected feedback problem (Such as mechanical resonance)As well as the development time and other factors. Modern motor control system is facing the bad environment, work in a variety of problems, and the total efficiency of the traditional solution is usually restricted to the whole system of the worst. The adaptive control algorithm to extract the optimized mechanical and electrical system is essential for maximum efficiency. System mapping if you want to get the highest efficiency, it has to be on the system of mechanical and electrical boundary conditions for mapping. All system variables must be considered: temperature, mechanical degradation, acceleration, speed, power supply voltage and so on. System architecture will affect it. In the open loop system, usually need to be the worst of the current drive and speed curve to motivate motor, so we can believe that the efficiency is not the primary design goals of this kind of system. This type of test is very time consuming, because must be in the motor may use all of the power supply voltage, temperature and velocity values to verify this system, to minimize the risk of a resonance. Every step motor system exists the possibility of resonance occur, usually because of work in the (Or close to)The natural frequency of the motor. To avoid these areas is crucial, because resonance may cause motor lose step into a state or stall. However, for the open loop system, determine these areas can be very difficult. Closed-loop control usually USES the following two forms: based on the sensor system (Light or hall effect)And no sensor system. Sensorless system also known as the 'half closed loop system', often use the voltage produced by the motor coil as a feedback. Control system based on sensor is widely used, but the sensor must be taken into account in mapping practice other changes. Sensorless system is a major advantage is that it only need to read the information related to the physical movement of the motor. It's another important advantage is to reduce cost of the system of closed loop or half closed loop system, at the same time, because do not need external sensor, also reduces the complexity of the system. Successful design needs to understand the characteristics of the counter electromotive force. The SLA mapping counter electromotive force can be easily extracted detailed information associated with the movement of mechanical and electrical system, and provide diagnostic data. Between the motor's drive current pulse, motor coil movement through the magnetic field, can produce voltage. This information is usually referred to as the speed of the motor and/or load Angle (SLA)。 By monitoring the size of the back emf well approximate stepper motor angular velocity. Figure 1 shows the use of AMIS -30522 subdivision drive stepping motor controller installed in the mechanical system of the traditional mapping of SLA pin when stepping motor. This information is on the NXT input (To determine the speed of motor excitation clock input)To sweep in the process of collection. As it moves from left to right, the higher the frequency of the excitation, can clearly see different work area. Measuring of the capability of the electrical characteristics of the whole system is AMIS -305 xx series has a very powerful feature -—In particular, it can deal with the traditional design problem, and before that, the system designer only resonance analysis of motor performance, and didn't realize that once the mechanical device together after these regions may change. the main products: stepper motor, brushless motor, servo motor, stepping motor drive, brake motor, linear motor and other kinds of models of the stepper motor, welcome to inquire. Telephone:
