: The reservoir or sump.
A device which generates an AC or DC signal proportional to the
speed at which it is rotated and the polarity of which is dependent
on the direction of rotation of the rotor.
Enclosed Non-Ventilated): Acronym describing a type of motor
enclosure, which has no outside air going into it. It is cooled
only by convection to the frame, which is usually finned.
To permit passing of a restricted flow. May control flow rate or
create a deliberate pressure drop.
Resistance (Rth) (0c/watt): An indication of how
effectively a unit rids itself of heat, a measure of temperature
rise per watts lost. In Powertec Industrial Motors literature, it
is the specified value from the motor windings to the ambient ,
under locked rotor condition.
A temperature sensitive pilot duty device mounted on the interior
of the motor to protect it from over heating.
protection: A thermal sensing device mounted to the motor to
protect it from overheating. This is accomplished by disconnecting
the motor phases from the drive in an temperature condition.
device that converts one type of energy to another. An example would
be the transducer sensing pressure and generating an electrical
signal in proportion to the pressure.
Force tending to produce rotation.
Constant: KT= The torque generated in a Dc motor per unit Ampere
applied to its windings.
KT = Toz-in / Aamp
Simplified for a brushless motor at 900 commutation angle.
Ripple: The cyclical variation of generated torque at a frequency
given by the product of motor angular velocity and number of commutator
segments or magnetic poles.
Ratio: Defined as a motor's holding torque divided by the inertia
of its rotor. The higher the ratio, the higher a motor's maximum
acceleration capability will be.
Inputs on a controller that initiates or trigger the next step in
Transistor-Transistor Logic, Describes a common digital logic device
family that is used in most modern digital electronics. TTL signals
have two distinct states that are described with a voltage-a logical
"zero" or "low" is represented by a voltage
of less that 0.8 volts and a logical "one" or "high"
is represented by a voltage from 2.5 to 5 volts.
Flow (Turbulenece): A condition where the fluid particules move
in random paths rather than in continues paralle path.
A rotary device that is actuated by the impact of a moving fluid
against blades or vanes.
Valve: A directional control valve with two flow paths.