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Stepper motors are
brushless Cheap
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pulses into mechanical rotation. Due to rugged construction, high reliability,
high torque at low speeds, and their lower price, they are seen in both
commercial and industrial applications.
The Fundamental Notion
Every
revolution of a stepper motor is divided into a discrete amount of measures.
Typically an individual turning is 200 measures or 1.8 degrees of rotation per
step. Each step is the same size, and since a stepper motor can only just take
one step at a time, the position of the motorcan be controlled without feedback.
Clearly, as the pulsation frequency increases the discrete measure movement will
change with the rate directly proportional to the pulsation frequency - into
continuous rotation.
Types of Step Motors
You can find three basic types:
variable reluctance, permanent magnet, and hybrid. Hybrid motors combine the
finest characteristics of the other two kinds. They are built with a permanent
magnet rotor and toothed stator poles. Standard hybrids have 200 rotor teeth and
rotate at 1.8 degrees per step. Winding connection stepper motor windings may be
connected in parallel or series. Sequence connection provides greater torque at
low speeds. Concurrent connection lowers the inductance providing increased
torque at speeds that are quicker. The main advantage of steppers over DC Motors
(Gleichstrommotoren) or DC Gearmotors (Getriebemotoren) is that they are able to
react much faster without increasing the current.
Driver Output
Restricting
The available motor torque vs. speed depends on the driver output
voltage. The drive should be current limited to the step motor evaluation, since
the driver output signal can be rated as much as twenty times higher than the
motor voltage.Summary controller, or the indexer, provides step and direction
outputs to the driver. Most applications demand that the indexer also handles
steps per space and second, acceleration, deceleration.The indexer is not
incapable of receiving high level commands from a host and generating the
crucial step and direction pulses to the driver. Communicating to the indexer is
usually via a RS232 or RS485 interface. Nevertheless, it can also monitor input
signals from Go, Jog, Home and Limit switches that are external.
Indexer
Stand-Alone Operation
Independent of the host cans also operate. It can be
initiated from auxiliary IO. or remote operator HMI's once a program is loaded
into the controller
Closed loop applications that demand booth detection and
exact motor position capacity will generally be pre-packaged with power supply,
a driver and optional encoder.
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