Rockwell-automation FlexPak 3000 Power Module SW-Version 4.3 Manual de usuario Pagina 104

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APPENDIX A
FlexPak 3000 49’1340 e
A-2
Motor: A device that converts electrical energy to mechanical energy to turn a shaft.
Motor Electrical Time Constant: The ratio of electrical inductance to armature resistance.
Electrical time constant in seconds defined as electrical:
T/C = La x Ia / Hot IR voltage drop
Motor Identification:
Frame designation (actual frame size in which the motor is built)
Power, speed, design and enclosure
Voltage, frequency and number of phases of power supply
Class of insulation and time rating
Application
Motor Nameplate: The plate on the outside of a motor which describes the motor, kW, voltage, RPM,
efficiency, design, enclosure, etc.
Motor Thermostat: Unit applied directly to the motor's windings which senses winding temperature and may
automatically break the circuit in an overheating situation.
Non-Retentive: Information and/or data not retained while power to the drive is OFF.
Rated Full Load Current: Armature current in amperes.
Retentive
: Information and/or Data retained while power to the drive is OFF.
RPM: Revolutions per Minute - The number of times per minute the shaft of the motor (machine) rotates.
Service Factor (SF): When used on a motor nameplate, a number which indicates how much above the
nameplate rating a motor can be loaded without causing serious degradation, (i.e. a 1.15 SF can produce
15% greater torque than a 1.0 SF rating of the same motor).
Tachometer: Normally used as a rotational sensing device. Tachometers are typically attached to the output
shaft of a motor requiring close speed regulation. The tachometer feeds its signal to a control which adjusts its
input to the motor accordingly (called "closed loop feedback" control).
Top Speed: The highest speed a drive can achieve. Top Speed equals Base Speed when there is no field
weakening.
Torque: Turning force delivered by a motor or gear motor shaft, usually expressed in Nm:
M [Nm] = P [kW] x 9550 / n [RPM] = full load torque
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