Author name: Engr. Aneel Kumar

VOLTAGE IMBALANCE: Voltage imbalance is regarded as any differences in the three phase voltage magnitudes and/or shift in the phase separation of the phases from 120 degrees.It is normally expressed as the negative phase sequence divided by the positive phase sequence,as a percentage, measured using line to line voltages. EFFECTS OF VOLTAGE IMBALANCE: The effects of […]

The following points are the difference between Induction and Synchronous motor.

Variously called intelligent motors, smart motors or integrated motors and drives, these units combine a three-phase electric motor and a pulse width modulated inverter drive in a single package. Some designs mount the drive components in what looks like an oversize conduit box. Other designs integrate the drive into a special housing made to blend

Direct current drives are easy to apply and technologically straight forward. They work by rectifying AC voltage from the power line to DC voltage, then feeding adjustable voltage to a DC motor. With permanent magnet. DC motors, only the armature voltage is controlled. The more voltage supplied, the faster the armature turns. With wound-field motors, voltage

Major maintenance, troubleshooting and repair of drives should be left to a qualified technician, following the drive manufacturer’s recommendations. However, routine maintenance can help prevent problems. Here are some tips: • Periodically check the drive for loose connections or any other unusual physical conditions such as corrosion. • Vacuum or brush heat sink areas regularly.

As PWM AC drives have continued to increase in popularity, drives manufacturers have spent considerable research and development effort to build in programmable acceleration and deceleration ramps, a variety of speed presets, diagnostic abilities, and other software features. Operator interfaces have also been improved with some drives incorporating “plain- English” readouts to aid set-up and

One drawback to pulse width modulated drives is their tendency to produce voltage spikes, which in some instances can damage the insulation systems used in electric motors. This tendency is increased in applications with long cable distances (more than 50 feet) between the motor and drive and with higher-voltage drives. In the worst cases, the

By definition, adjustable speed drives of any type provide a means of variably changing speed to better match operating requirements. Such drives are available in mechanical, fluid and electrical types. The most common mechanical versions use combinations of belts and sheaves, or chains and sprockets, to adjust speed in set, selectable ratios – 2:1, 4:1,

When a current-carrying conductor is placed in a magnetic Field, it experiences a force. Experiment shows that the magnitude of the force depends directly on the current in the wire, and the strength of the magnetic Field, and that the force is greatest when the magnetic Field is perpendicular to the conductor. In the set-up

Actuators are operated in the same way as solenoids. They are used to move mechanisms remotely. Some examples of actuators on a vehicle are, door locks, pre-engaged starter motors and fuel cut off valves. Consider the diagram below. Like a solenoid or relay an actuator has a winding. When current flows around the winding, the