TMR-040-010-4 DC Limited Angle Torque Motor
The TMR-040-010-4 is comprised of a toroidally wound, stationary, coil assembly with a multi-pole permanent magnet rotor.
Rotor: The rare earth permanent magnet rotor always has an even number of poles, with any where from 2 to 6 poles. The maximum angular excursion with a 2-pole rotor is 180º, with a 4 pole rotor is 90º, and with a 6 pole rotor is 60º. The torque will drop off to zero at the extreme ends of the travel. For constant torque over the required rotation, the angular excursion will always be less than numbers mentioned above. The rotor is comprised of steel core with a thru hole for attaching the rotor to the shaft. Radially magnetized, multipole, rare earth, permanent magnets are bonded to the steel core. Depending on the application either Neodymium or Samarium Cobalt magnets are used. Stator: The stator is comprised of a “soft”magnetic steel toroid that is electrically insulated. Multiple sections of insulated copper magnet wire are toroidally wound on the stator toroid. Only 2 leads are brought out from the stator assembly. The rotor assembly is installed within the ID of the stator assembly. There is a magnetic attractive force between the stator and the rotor. When the stator is perfectly concentric within the rotor, the radial magnetic attractive forces are equal and opposite and they cancel each other out. Limited Angle Torque Motor Advantages:
Applications:
Operating Information Required Electronics The motor requires a 1 phase brushless linear amplifier with power supply, that is rated with sufficient current and voltage to meet the motion requirements. A linear amplifier is required because of the very low inductance of the torquer coil assembly. A programmable motion controller is required to close the position loop on the system. Environmental Considerations The torquer is a precision device with sensitive components, it should not be mounted in an environment that is wet or excessively dirty. The magnetic assembly is highly magnetic, it should not be placed in an area where loose steel particles can be drawn into the magnetic gap. The torquer should not be mounted in an environment with high ambient temperatures (>50ºC). Mounting The torquer is typically supplied with out bearings and a shaft. This allows for the stationary and moving parts of the torquer to be mounted directly to the customers rotary payload assembly. The 2 components of the torquer should be mounted such that they are concentric to one another within .001". The rotor and the stator will have a mounting provisions to allow for attachment to the customers system. Maintenance The torquer requires no maintenance. Ordering Information Torquers can be ordered for any angular excursion up to 360° and continuous torques up to 1000 ounce-inches. The torquers are built as the orders are placed, they are not stocked, as each customer requirement is different.
Specifications
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The TMR-040-010-4 is
a toroidally wound iron core stator with a 2 ,4 or 6 pole permanent magnet rotor. This torque motor can provide
angular excursions up to 180º. It is typically supplied without bearings, shaft or housing to allow for
direct mounting to customer supplied bearing system.
