![]() ![]() Overcoming your problems with servo motors from ASPINAĪSPINA supplies synchronous (SM) servo motors that use brushless DC motors. IMs do not use permanent magnets and tend to be used in higher output applications (10kW or more). However, with the emergence of high-performance permanent magnets in recent years, synchronous AC servo motors are now the default option. For this reason, they are widely used for low power applications (up to 10kW). To increase motor output, the amount of permanent magnet usage (which are expensive) increases, and therefore makes them cost more. The difference is based on whether or not they have a permanent magnet. Although their control is more complex than that of DC motors, advances in control technology enabled them now to be the most common type of servo motor.ĭepending on their drive mechanism, AC servo motors can be divided into synchronous motors (SMs) and induction motors (IMs). These are servo motors driven with an alternating current (AC) motor. Although DC motors are easier to control than AC motors and were widely used in the past for their small size and low cost, advances in AC motor control technology has seen fewer opportunities for their use in recent times. These are servo motors driven with a brushed direct current (DC) motor. Servo motors can be grouped into DC servo motors and AC servo motors DC servo motors Unexpected changes in load, for example, can result in the motor getting out of synchronization (meaning the rotational angle of the motor differs from the angle specified by its input). Although this avoids the need for a position sensor, it also means that there is no way to detect position deviations. Accordingly, the driver controls position based on the number of input pulses it receives from the controller. For stepper motors, in contrast, the rotational angle of the motor is proportional to the number of input pulses. This provides precise stopping accuracy and the ability to move back to its original position should motor position deviation occur when stopped. Servo motors have an encoder (rotational motion detector) that can determine their rotational position and use this information to perform feedback control of motor position. ![]() However, these two types of motors differ in the following ways. ![]() Like servo motors, stepper motors have the ability to control their angle of rotation based on an external input, and therefore are also able to be used for positioning machinery and similar applications. Differences between servo motors and stepper motors ![]()
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