- Отрасли: Electrical equipment
- Number of terms: 4774
- Number of blossaries: 0
- Company Profile:
The degree of obstacle presented by a material to the flow of electric current is known as resistance and is measured in ohms.
Industry:Electrical equipment
A suspension system or cushioned mounting designed to reduce the transmission of normal motor noise and vibration to the mounting surface. This type of mounting is typically used in fractional motors for fans and blowers.
Industry:Electrical equipment
Unless otherwise specified, a general-purpose DC motor is reversible. A DC motor can be reversed by changing the polarity of the field or the armature, but not both. When rapid reversing is necessary, the armature circuit is reversed. In some cases, it is frequently more advantageous to reverse the field connections of shunt motors, since the controls have to handle much less current, especially on large motors, than do armature-circuit contactors. An AC motor is reversed by reversing the connections of one leg on three-phase power or by reversing the leads on single phase.
Industry:Electrical equipment
A special bearing system with cylindrical rollers capable of handling belted applications, too large for standard ball bearings.
Industry:Electrical equipment
The force created by the stator once power is applied to it that causes the rotor to turn.
Industry:Electrical equipment
The rotating member of an induction motor made up of stacked laminations. A shaft running through the center and a squirrel cage made in most cases of aluminum which holds the laminations together and act as a conductor for the induced magnetic field. The squirrel cage is made by casting molten aluminum into the slots cut into each lamination.
Industry:Electrical equipment
Are protection which can be placed over openings in the fan cover on a fan-cooled motor or ventilation openings of a protected motor to help keep out large particles and/or animals, but not block ventilation.
Industry:Electrical equipment
Winding which is not connected to the power source, but which carries current induced in it through its magnetic linkage with the primary winding.
Industry:Electrical equipment
Where high starting torques are required for a DC motor, the series motor is used. The load must be solidly connected to the motor and never decrease to zero to prevent excessive motor speeds. The load must tolerate wide speed variations from full load to light load.
Typical areas of application are industrial trucks, hoists, cranes, and traction duty.
Industry:Electrical equipment
1. 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 S-F can produce 15% greater torque than the 1.0 S-F rating of the same motor).
2. When used in applying motors or gearmotors, a figure of merit which is used to "adjust" measured loads in an attempt to compensate for conditions which are difficult to measure or define. Typically, measured loads are multiplied by service factors (experience factors) and the result in an "equivalent required torque" rating of a motor or gearmotor.
Industry:Electrical equipment
