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BTA® Actuators Selection |
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Product comparison and links to datasheets |
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BTA rotary, non-axial stroke actuators are a good solution for applications requiring reliable, low hysteresis operation with a good torque profile. Proportional operation is possible by adding your simple pulse width modulation (PWM) to control coil current. The BTA can allow open or closed loop velocity and position control. Such proportional control is ideal for silent, shock-free actuation applications. (In open loop applications, PWM improves hysteresis over variable DC voltage control.)
The addition of position feedback, and the subsequent improved system stiffness and accuracy, enables the BTA to be used in closed loop applications.
The bearing system consists of two ball-type bearings which are key to low hysteresis operation. The coil is bobbin wound and can be potted for wet armature applications. |
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Principle of Operation |
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The BTA has a single phase coil with three stator poles and matching rotor poles. When the coil is energized, the poles align along the flux path. With the three pole design, it is possible to have a stroke of up to 45°. In practical usage, external stops should be used to attain maximum unit life.
Subsequently, the stroke angle is slightly shorter. Use of such mechanical stops also serve to limit the actuator stroke to its optimum stroke/torque capacity. By not requiring full stroke actuation, the BTA offers maximum design flexibility across a wide range of stroke angles and torque requirements. |
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Quiet |
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The BTA can operate virtually noise free. Electronically controlled, the BTA provides soft, shock-free cycling without the noise associated with end-of-stroke mechanical stops.
Used in conjunction with cushioned external stops, noise can be minimized and the unit's life can be extended to that of the precision ball bearings. |
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Rapid Cycling
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The BTA actuator requires only milliseconds to rotate through its entire stroke. It can maintain this extremely fast operating speed repetitively without diminishing accuracy or repeatability, or reducing the overall life of the unit. |
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Rugged |
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The BTA design eliminates the axial travel associated with conventional rotary actuators. In so doing, the BTA eliminates loading on associated mechanical linkages, and reduces the number of moving parts and the wear they receive. The BTA is self-contained in an industry standard size which enables easy mounting and interchangeability. The unit is permanently lubricated and requires no adjustment or maintenance over its entire life. |
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Powerful . . . with Less Power |
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The BTA actuator offers considerably more torque than comparably sized rotary actuator designs.
Even with its high torque output, the BTA requires 40% less power input than competitive units, and conserves as much as 18.9 watts per actuator cycle. |
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Metric Models
BTA Selection Overview |
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Package Dimensions
(mm)
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Maximum Stroke
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Gross Starting
Torque (mNm)
@ Specified Duty
Cycle
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Gross Starting
Torque (mNm)
@ Specified Duty
CycleÊ
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Size
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Dia.
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Length
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(degrees)
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100%
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50%
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25%
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10%
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100%
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50%
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25%
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10%
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2EVM
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30.2
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18.3
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45
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N/A*
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31.6
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56.5
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113.0
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N/A*
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21.5
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37.3
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65.5
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3EVM
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34.9
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22.6
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45
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31.6
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50.9
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94.9
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187.6
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24.9
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35.0
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59.5
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99.4
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4EVM
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41.3
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26.8
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45
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45.2
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104.0
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180.8
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322.1
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40.7
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72.3
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113.0
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180.8
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5EVM
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49.2
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32.1
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45
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153.7
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266.7
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420.4
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678.0
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117.5
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185.3
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293.8
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474.6
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6EVM
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58.7
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41.3
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45 |
384.2
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655.4
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971.8
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1457.7
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226.0
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418.1
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565.0
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791.0
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| All data is at 20°C coil temperature. Torque outputs degrade with elevated temperatures. |
| * Not recommended for 100% duty. |
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Imperial Models
BTA Selection Overview |
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Package Dimensions
(in)
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Maximum Stroke
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Gross Starting
Torque (lb-in)
@ Specified Duty
Cycle
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Gross Starting
Torque (lb-in)
@ Specified Duty
Cycle
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Size
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Dia.
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Length
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(degrees)
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100%
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50%
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25%
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10%
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100%
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50%
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25%
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10%
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2EV
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1.188
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0.719
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45
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N/A*
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0.28
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0.50
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1.00
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N/A*
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0.19
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0.33
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0.58
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3EV
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1.375
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0.890
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45
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0.28
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0.45
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0.84
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1.66
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0.22
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0.31
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0.53
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0.88
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4EV
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1.625
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1.055
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45
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0.40
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0.92
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1.60
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2.85
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0.36
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0.64
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1.00
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1.60
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5EV
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1.937
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1.265
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45
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1.36
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2.36
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3.72
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6.00
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1.04
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1.64
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2.60
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4.20
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6EV
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2.312
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1.625
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45 |
3.40
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5.80
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8.60
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12.90
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2.00
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3.70
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5.00
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7.00
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| All data is at 20°C coil temperature. Torque outputs degrade with elevated temperatures. |
| * Not recommended for 100% duty. |
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File Format Help
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ZIP: Some files need to be unzipped. Unzip utilities available for download for Windows / Macintosh.
For technical difficulties with this page contact us here.
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L309
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