Facts Worth Knowing about AC Drives – Electromagnetic Compatibility Sections 6.5 – 6.7

Facts Worth Knowing about AC Drives – Electromagnetic Compatibility Sections 6.5 – 6.7

Variable speed drives, due to their operating principle, produce a series of unwanted secondary effects, such as: motor winding isolation stress, bearing stress, acoustic switching noise in the motor and electromagnetic interference. In most applications these effects are at an acceptable level – but in some cases these effects need to be mitigated.

 

 

 

Facts Worth Knowing about AC Drives – Electromagnetic Compatibility 6.1 – 6.4

Facts Worth Knowing about AC Drives – Electromagnetic Compatibility 6.1 – 6.4

Electromagnetic interference (EMI) is the degradation of the performance of equipment caused by electromagnetic disturbance. An example of EMI, is the noise on a microphone, if there is a cell phone next to it doing a handshake with a communication tower to process a call. In this example the cell phone is the source of the interference and the microphone is the victim equipment.

 

 

 

Facts Worth Knowing about AC Drives – Saving Energy with AC Drives Sections 5.5 – 5.8.2

Facts Worth Knowing about AC Drives – Saving Energy with AC Drives Sections 5.5 – 5.8.2

Potential ways to save energy can be found in almost all sectors, like building services, conveyor belt systems or chemical processes. The life cycle costs of an application can be roughly divided into four parts: the initial investment cost, the cost for the operation and maintenance of the application, the cost of the energy required by the application and the disposal cost at the end of the life cycle of the application.

 

 

 

Facts Worth Knowing about AC Drives – Saving Energy with AC Drives Sections 5.1 – 5.4.2

Facts Worth Knowing about AC Drives – Saving Energy with AC Drives Sections 5.1 – 5.4.2

Electric motors account about 50% of global electrical energy consumption *). In Industrial applications the ratio is even higher. Depending on the region and the industrial area, 65-75% of electrical energy in industry is used for electric motors. Therefore, electrical drive technology holds a great deal of potential for reducing the worldwide energy consumption.

 

 

 

Facts Worth Knowing about AC Drives – Star and Delta Configuration in Field Weakening Operation Sections 4.5 – 4.8

Facts Worth Knowing about AC Drives – Star and Delta Configuration in Field Weakening Operation Sections 4.5 – 4.8

Machines can create potential or kinetic energy which we want to remove from the machine. The dynamic characteristics of some loads require 4-quadrant operation. A reduction in the stator frequency (and voltage) by the AC drive allows the motor to act as a generator and convert mechanical energy into electrical energy. Motors connected directly to the mains deliver the braking energy straight back to the mains.

 

 

 

Facts Worth Knowing about AC Drives – Star and Delta Configuration in Field Weakening Operation Sections 4.1 – 4.4.7

Facts Worth Knowing about AC Drives – Star and Delta Configuration in Field Weakening Operation Sections 4.1 – 4.4.7

The major technical characteristics of a motor are found on its nameplate. The information shown is very relevant for the electrical installer because values for voltage, frequency and full load current are given, but important information for the mechanical design is missing and can be found in the datasheet, catalogue, or by direct contact to the motor manufacturer.

 

 

 

Danfoss: Facts Worth Knowing about AC Drives – AC Drives, Sections 3.6 – 3.7.5

Danfoss: Facts Worth Knowing about AC Drives – AC Drives, Sections 3.6 – 3.7.5

 

The inverter is the last of the main elements making up the AC drive. The inverter processes represent the final stage in terms of generating the output voltage and frequency. When the motor is connected directly to the mains, the ideal operating conditions apply at the rated operating point.

The AC drive guarantees good operating conditions throughout the whole speed range by adapting the output voltage to the load conditions. It is thus possible to maintain the magnetization of the motor at the optimal value.

 

Facts Worth Knowing About AC Drives – Electric Motors Sections 2.4 – 2.4.8

Facts Worth Knowing About AC Drives – Electric Motors Sections 2.4 – 2.4.8

The synchronous motor is defined by the fact that the rotor rotates at the same speed as the magnetic field created by the stator windings. The design of the stator is in many cases similar to that of induction motors, with distributed windings. Some manufacturers use concentric windings (in slot) which enable a more compact motor design and require less copper. The energy savings achieved by the reduced use of copper are however often eaten up by additional losses, which result from harmonics in the air gap flux caused by the construction.

 

 

 

Versatility, Precision and Short Lead Times: The CRD MR Rotary Indexer

Versatility, Precision and Short Lead Times: The CRD MR Rotary Indexer

 

Whether due to a bustling economy, reshoring, better technology or a skilled- labor shortage, manufacturers are automating more than ever before. According to ASSEMBLY magazine’s annual Capital Equipment Spending Survey, 89 percent of U.S. factories employed manual assembly processes in 2009, while only 17 percent used fixed automation.