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Thermal Overload
The threads that wouldn't die...
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
Fortune
Nasrudin walked into a teahouse and declaimed, "The moon is more useful
than the sun." "Why?", he was asked. "Because at night we need the
light more."
than the sun." "Why?", he was asked. "Because at night we need the
light more."
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from the Automation List department...
Mechanical torque to reverse rotation
A brushless DC motor that rotates (cw) at a nominal velocity, 0.5 NxM moment. We apply force/torque (through a mechanical transmission) on the motor’s shaft until it stops rotating. Then after the mechanical torque is increased causing a reverse direction of the shaft (ccw). The winding’s current is measured continuously.
Please advise an appropriate motor and “how to” control (forward/backward).
Please advise an appropriate motor and “how to” control (forward/backward).
You simply change motor's mode of operation - from motor to generator one. As you may any PMBL motor.
But what parameter do you want to control (i.e. moment, velocity, etc.)?
But what parameter do you want to control (i.e. moment, velocity, etc.)?
From Control Engineering magazine...
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Above articles copyright 2009 Reed Business Information.
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