Rockwell Automation FlexPak 3000 Power Module Version 4.2 - Manual (Page 104)

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