Technic Motor

Technic Motor
Why we use DOL starter upto 5 HP motor and STAR DELTA motor for highr rating?

DOL starter is only upto 5 HP motors. Whereas when motor rating increase we will use STAR DELTA starter only. Can any one kindly confirm a concrete technical reason for this?

Star Delta starters are generaly used in situations where you want to reduce the inrush current to the motor when the starting contacts close….. When a relay starter closes on a motor wired delta it can draw as much as 5 times its running current….. This can cause nuisance trips of circuit breakers but it can also cause lights in a building to dim and other low voltage conditions…. When a motor starter starts in star it draws far less inrush current to the motor windings….. Where i worked we had an air conditioning chiller that would draw up to 550 amperes when running at full power…. It was connected to a unitized switchgear substation with a capacity of only 6000 amps @ 480 volts. This 6000 amp station also had to power part of a big office building besides the chiller…. If it started straight delta drawing up to 3000 amps it would have tripped the main circuit breaker to the building with all the offices, computers and anything else on this switch gear….. The capacity was 6000 amps and it still had to run an office building plus the chiller. So we had a star delta starter….. When the chiller started the relay would close star and the motor would spin for about 30 seconds…. In this 30 seconds the inrush current was lower and it would take a few moments for the motor to get up to full speed…. When it reached full speed the starter in a split second would open the star contacts and close the delta side of the relay before the motor had anytime to lose speed….. The occupants of the building would not see any of the lights blink or computer screens glitch….. Lower inrush current is why they use these star delta starters especialy where there may be a limited capacity of the buildings electrical equipment…..

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General Motors Opens New Plant in China, Sells Allison Transmission Unitgeneral Motors Opens New Plant in China, Sells Allison Transmission Unit

General Motors Corp. has inaugurated a new engine plant at its minicar factory SAIC-GM-Wuling Automobile Co. Monday in southern China.

The new engine plant, which reportedly cost the automaker 2 billion yuan ($263 million) lies adjacent to the factory in Liuzhou and is set to produce a capacity of 300,000 units a year. The automaker has said in a statement that production of 1.1-liter and 1.2-liter engines are set to begin in August.

According to the company statement, the new engine plant will facilitate new product development at the minicar factory, which now buys engines and related parts from outside suppliers. The engines will be used first in a new minivan model, the Wuling Hong Tu, a vehicle jointly developed by GM’s Pan Asia Technical Automotive Center and SAIC in Shanghai.

SAIC-GM-Wuling Automobile Co. is a three-way commercial vehicle joint venture between GM, Shanghai-based partner SAIC Motor Corp., and Guangxi province-based Wuling Automobile Co. GM owns 34 percent of the venture, SAIC has 50.1 percent and the remainder is held by Wuling Automobile.

In the first quarter, SAIC-GM-Wuling Automobile’s unit reported sales which climbed to 27 percent from a year earlier to more than 160,000 vehicles. In 2006, SAIC-GM-Wuling sold 460,155 vehicles, making it the biggest mini-vehicle producer in China.

Meanwhile, back in the home front, the General Motors continues to struggle as the automaker decided to sell its Allison Transmission unit to a pair of buyout firms for $5.6 billion on Thursday last week.

Reports say that GM, which has lost more than $12 billion in two years, will use the money to cover turnaround-related expenses including plant closings, worker buyouts and the production of new models.

GM has agreed to sell Allison’s commercial and military business, based in Indianapolis, to investment firms The Carlyle Group and Onex Corp. A production facility in Baltimore that builds conventional and hybrid transmissions for pickup trucks and sport utility vehicles however, will remain with GM.

The automaker’s move is key to the automaker’s strategy to cost-cut by letting go of units which are not directly related to the core business of building passenger cars and trucks. Aside from the Alison deal, the automaker has also sold more than $16 billion in assets over the past two years, including last year’s $14 billion sale of the GMAC financial services company to private equity firm Cerberus Capital Management LP. The automaker – which also makes auto parts like GMC mud flap, is likewise reportedly mulling over the idea of putting a Flint-based unit that makes medium-duty trucks up for sale too.

Wall Street on Thursday responded positively to news of the Allison sale, sending GM stock up 2 percent to $38.15 — its highest level since January 2005.

About the Author

Iver Penn is a Mass Communications graduate who hails from Wyoming. She is at present an associate editor of a publishing company in Colorado.