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a. the engine, esp an internal-combustion engine, of a vehicle
b. (as modifier): a motor scooter
2. a machine that converts electrical energy into mechanical energy by means of the forces exerted on a current-carrying coil placed in a magnetic field
3. any device that converts another form of energy into mechanical energy to produce motion
a. Chiefly Brit a car or other motor vehicle
b. as modifier: motor spares
5. producing or causing motion
6. Physiol
a. of or relating to nerves or neurons that carry impulses that cause muscles to contract
b. of or relating to movement or to muscles that induce movement


A machine that converts electric energy into mechanical energy by utilizing forces produced by magnetic fields on current-carrying conductors. Also known as electric motor.
Pertaining to efferent nerves which innervate muscles and glands.
That which causes action or movement.


A machine that converts electrical into mechanical energy. Motors that develop rotational mechanical motion are most common, but linear motors are also used. A rotary motor delivers mechanical power by means of a rotating shaft extending from one or both ends of its enclosure (see illustration). The shaft is attached internally to the rotor. Shaft bearings permit the rotor to turn freely. The rotor is mounted coaxially with the stationary part, or stator, of the motor. The small space between the rotor and stator is called the air gap, even though fluids other than air may fill this gap in certain applications.

In a motor, practically all of the electromechanical energy conversion takes place in the air gap. Commercial motors employ magnetic fields as the energy link between the electrical input and the mechanical output. The air-gap magnetic field is set up by current-carrying windings located in the rotor or the stator, or by a combination of windings and permanent magnets. The magnetic field exerts forces between the rotor and stator to produce the mechanical shaft torque; at the same time, in accord with Faraday's law, the magnetic field induces voltages in the windings. The voltage induced in the winding connected to the electrical energy source is often called a countervoltage because it is in opposition to the source voltage. By its magnitude and, in the case of alternating-current (ac) motors, its phase angle, the countervoltage controls the flow of current into the motor's electrical terminals and hence the electrical power input. The physical phenomena underlying motor operation are such that the power input is adjusted automatically to meet the requirements of the mechanical load on the shaft. See Electromagnetic induction, Magnet, Windings in electric machinery

Both the rotor and stator have a cylindrical core of ferromagnetic material, usually steel. The parts of the core that are subjected to alternating magnetic flux are built up of thin steel laminations that are electrically insulated from each other to impede the flow of eddy currents, which would otherwise greatly reduce motor efficiency. The windings consist of coils of insulated copper or aluminum wire or, in some cases, heavy, rigid insulated conductors. The coils may be placed around pole pieces, called salient poles, projecting into the air gap from one of the cores, or they may be embedded in radial slots cut into the core surface facing the air gap. In a slotted core, the core material remaining between the slots is in the form of teeth, which should not be confused with magnetic poles. See Eddy current

Direct-current (dc) motors usually have salient poles on the stator and slotted rotors. Polyphase ac synchronous motors usually have salient poles on the rotor and slotted stators. Rotors and stators are both slotted in induction motors. Permanent magnets may be inserted into salient pole pieces, or they may be cemented to the core surface to form the salient poles.

The windings and permanent magnets produce magnetic poles on the rotor and stator surfaces facing each other across the air gap. If a motor is to develop torque, the number of rotor poles must equal the number of stator poles, and this number must be even because the poles on either member must alternate in polarity (north, south, north, south) circularly around the air gap.


A machine which converts electric power into mechanical power by means of a rotating shaft.
References in periodicals archive ?
Although during wakefulness the intensity of motor output to the pharyngeal dilator muscles increases rapidly when needed to compensate for increasing upper airway resistance, sleep impairs the compensatory increase in neural drive, and REM sleep impairs it the most.
If the vehicle gear stick is erroneously shifted when the accelerator pedal is applied, or if other abnormal gear shifting is detected, a warning is displayed and engine or motor output is reduced to limit sudden starts or acceleration.
Greater motor output is associated with greater rotor and shaft diameter; however, in this case, the resulting larger bearing diameters only allow for lower rpm.
Major Specifications of MAF150C and MAF180C Horizontal Boring Mills Boring spindle diameter MAF150C: 150mm, MAF180C: 180mm Ram size and shape 420x420mm, square Spindle rotation speed 6 - 2,500 revolutions per minute (rpm) Spindle motor output (rated) 55/75/85kW (continuous/30/10 minutes) Maximum spindle torque X-axis (column, crossfeed) 5,000mm (extendable by 2,000mm increments) Y-axis (saddle, vertical) 3,000mm (4,000mm, 5,000mm) Z-axis (ram, longitudinal) 1,250mm W-axis (boring spindle, longitudinal) 1,000mm Cutting feed rate 1-10,000mm/minute (mm/min) Rapid traverse rate X- and Y-axis 20,000mm/min Z- and W-axis 15,000mm/min Feed thrust force (common to all axes) 40,000 newtons (N) Machine size 4,600x10,500x7,500mm Machine weight 70,000 kilograms (kg)
They had investigated eddy-current drives that only impact motor output, are less efficient, more difficult to install, and only useful in decreasing equipment speeds.
Rats have a keen sense of smell, as do dogs," said Moxon, who focuses her research on understanding how the brain processes sensory information to produce intelligent motor output.
Using the two-wattmeter method, drive input/output and motor output efficiencies can be measured using the eight inputs on the HDO8000 oscilloscope.
Moreover, the new concept model enables the driver to make his/her own adjustments to some vehicle characteristics such as motor output and suspension settings, to embody the joy of maneuvering to the fullest extent.
The team also employed Keithley's instruments for telemetry purposes, collecting data on operating parameters such as battery voltages, temperatures, motor output, etc.