INDUCTION MOTORS ppt

... Liverpool John Moores University, 2002 74 6. POWER ELECTRONIC CONTROL OF INDUCTION MOTORS 6.1 Introduction Three-phase induction motors are the most frequently utilised electric machines in industry. ... squirrel-cage induction motors, with virtually maintenance-free operation. If operated with stator three-phase voltage supply of fixed frequency and fixed rms value, induction m...

Ngày tải lên: 11/07/2014, 05:20

... winding currents. (b) Self-starting single phase motors are the split phase motors, the capacitor motors, and the shaded pole motors. Induction Motors 2 Since f 2 =sf 1 , we have E 2s =sE 2 ... Hz 6 pole induction motor has the following constants in ohms per phase referred to the stator: R 1 =0.294, R 2 '=0.144, X 1 =0.503, X 2 '=0.209, and X m =13.25 IND...

Ngày tải lên: 11/07/2014, 05:20

... bolts and washers for installation. Manual for Induction Motors and Generators Safety Instruction - 8 3BFP 000 050 R0101 REV C Manual for Induction Motors and Generators Safety Instructions - 3 3BFP ... by crane with lifting slings. The sling positions are painted on the package. Manual for Induction Motors and Generators 34 - Installation and Alignment 3BFP 000 050 R0101 REV C...

Ngày tải lên: 26/01/2014, 09:20

... giữa sử dụng và bước servomotors máy. Cả hai loại máy tương tự như cung cấp các cơ hội cho chính xác vị trí, nhưng chúng khác nhau trong một số các cách khác nhau. Servomotors yêu cầu thông tin ... overtorqued, tất cả các kiến thức về rotor là mất vị trí và hệ thống phải được reinitialized; servomotors không phải là tùy thuộc vào vấn đề này. Bước trong máy được gọi là Schrittmotoren Ti...

Ngày tải lên: 22/12/2013, 07:18

... 376P Free Energy From the power of magnets can it be done? Copyright MOTORS MOTORS MOTORS MOTORS MOTORS MOTORS MOTORS MOTORS MOTORS Pe r ma nent Ma gnetPe r ma nent Ma gnet P e r m a n e n t ... angled carriage magnets they will work just fine just using one. magnet stack Permenant magnet motors are very easy to build don’t give up before you start do it and you will have fre...

Ngày tải lên: 19/01/2014, 20:20

... rings. This is the normal operating state of a slip-ring induction machine. The second type of induction machines are so-called squirrel-cage induction machines. Rotor winding is in this case cast ... power available inside an induction machine. Therefore induction machine has always to absorb reactive energy from the supply. Under all the possible operating conditions induction m...

Ngày tải lên: 23/01/2014, 06:20

... hand-corrected POS-tags. This did not lead to improvement. 2 Current Grammar Induction Models 2.1 Algorithms Grammar induction models can be split up into two types: tag-based and word-based grammar ... Adriaans and Mark R. Vervoort. 2002. The EMILE 4.1 grammar induction toolbox. In Proceed- ings of the 6th International Colloquium on Gram- mar Induction (ICGI), pages 293–295, Amsterd...

Ngày tải lên: 20/02/2014, 12:20

... has run up to 75% of full speed. m Φ m Φ aΦ Split Phase Principle Single Phase Motors • Similar to a 3 phase induction motor with squirrel cage rotor and main stator windgs. Main wndgs Start

Ngày tải lên: 27/06/2014, 19:20

... Consumption) 2 Chapter 13 – AC Motors • AC motors: 1. the armature of rotor is a magnet (different to DC motors) . 2. the stator is formed by electromagnets (like in DC motors) . 4 Using AC Supply ... difference = 90 deg. 18 Reactor Start AC Motor The Centrifugal Switch 1 Chapter 13 – AC Motors AC motors convert AC electrical energy to Mechanical energy. 32 26 Types of Motor Enc...

Ngày tải lên: 27/06/2014, 19:20

... 3/18/2008 4 §1. Induction experiment - Faraday’s and Lenz’s laws: 1.1 Induction experiment: Inside the shaded region, there is a magnetic field ... long time, the inductor behaves like an open switch. 3/18/2008 2 CHAPTER XI Electromagnetic Induction §1. Induction experiment - Faraday’s and Lenz’s laws §2. Induced electromotive force and induced ... l l r N turns I L B   L has units...

Ngày tải lên: 21/12/2013, 03:15