Oscillating motor has only one stator phase
A
Servotechnic product story
Edited by the Engineeringtalk editorial team
Jun 24, 2005
Haydon Switch has constructed an economical patented oscillating motor which has relatively few parts and only one stator phase.
Some stepper motor applications require that the motor takes only one step clockwise then one step anticlockwise, thus producing an oscillating, back and forth motion.
Conventional stepper motors can be used in oscillating modes but are often more complicated than they need to be to produce a simple oscillating motion.
Haydon Switch has simplified the design and constructed an economical patented oscillating motor which has relatively few parts and only one stator phase.
These low cost oscillating motors are available through UK agent Servotechnic.
What would have otherwise been a second stator phase is a magnet fixedly disposed, with respect to the rotor, to produce a detent position of the rotor.
When the stator is energised, the field of the fixed magnet is at least partially overcome and the rotor steps to its first predetermined position.
Alternately energising and de-energising the stator causes the rotor to oscillate between the two positions.
An angle of oscillation twice that produced may be provided by reversing the stator field to oscillate the rotor between the first predetermined position and the second predetermined position.
The oscillation frequency, up to 50Hz, is the function of the load and inertia that the motor has to move.
Series 1100 motors have a 22.5 degree basic step angle.
They can be constructed to accommodate sweep angles up to 60 degrees.
Coil windings from 1 to 12V are available.
The series 20000 motor is available with an 18 degree basic step angle and can be constructed to accommodate a sweep angle up to 90 degrees.
Coil windings from 1 to 40V are available.
The sweep angle of an oscillating motor is a factor of the basic step angle of the motor, magnet strength, load, inertia and frequency of oscillation.
Because of this, selecting the proper motor and optimising performance typically requires testing to be done with the actual mechanism to be oscillated.
Required torque is also an important factor in selecting the proper motor frame size, but inertia is even more critical in the selection and optimisation process.
Selection of an oscillating motor is usually done in conjunction with Haydon's application group.
The Haydon oscillating motors are available from UK agent Servotechnic and can be used in a wide variety of applications including barcode scanning devices, chopper devices, oscillation of mirrors and filters and life-science automation.
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