Although feedback is not usually required,stepper motors are compatible with
feedback signals,either analog or dgital.Error is noncumulative as long as pulse-to-step integrity is maintained by the
stepper motor.A stream of pulses can be counted into stepper motors,and the stepper motor's final position will be known
within a small percentage of one step.
虽然他们通常不需要反馈信号,但是步进电机能与模拟或数字的模拟信号兼容.只要脉冲-步进的过程完整执行,错误数据就不会积聚.步进电机可以给收到的脉冲信号流计数,而且每次步进的最终位置都可以很快的得知.
Since maximum dynamic torque occurs at low pulse rates,stepping motors can easily accelerate a load.When the desired position
is reached and command pulses cease,the stepper motor shaft stops and there is no need for clutches or brakes.The sepper motor
is generally left energized at a stop position.Once stopped,the stepper motor resists dynamic movement up to the value of the
holding torque.An additional feature of the PM stepper motor is that when all power is removed,it is magentically detented in
the last position.A wide range of step angles are available-1.8 to 80,for example-without logic manipulation.Stepper motors
have inherent low velocity without gear reduction.A typical stepper motor driven at 500 pps turns at 150 rpm.The stepper
motor's rotor inertia is usually low.Multiple stepper motors driven from the same source maintain perfect synchronization.But
the stepper motor'sefficiency is low;much of the input energy must be dissipated as heat.Load must be analyzed carefully for
optimum stepper motor performance.And inputsmust be matched to the stepper motor and load.Damping may be required when load
inertia is exceptionally high to prevent oscillation.
因在低频脉冲时发生最大动力矩,步进电机可以轻松的加载.当到达预定位置时,脉冲停止,步进电机轴停止转动,而不需要离合器或是刹车闸
.步进电机通常在停止位置时剩余部分能量.一旦停止,步进电机保持保持力矩所需的动量.PM步进电机的另一个特点是切断电源时,它会
电磁滞留在停止位置.它可以在很宽范围内转动,例如1.8到180度之间,不需要逻辑操作.步进电机拥有固有低速特性而不需减速齿轮.典型
的步进电机在500赫兹脉冲下达到150转/分钟.步进电机的转动惯量通常很小.同源驱动多步进电机可以维持完美的同步运转.但是步进电机
的效率低；多数的输入能量都必须以热量耗散掉.必须准确分析负载以达到最佳的步进电机性能.同时,输入能力必须与步进电机和负载匹配.
当负载惯性异常大时可能要加阻尼来防止振动.