International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
www.irjet.net
Permanent Magnet Motor Design for Elevator Application Using Induction motor Standard Lamination Harsh Goswami1, Parth Bhimani2 12Student
electrical Engg ,Institute of Technology Nirma University, Ahmedabad ,Gujarat, India. ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - In today's world permanent magnet motor is
more used for elevator application because of its feature like high efficiency, high starting torque, and silent working. In this paper design of PM motor is carried out for this rating and finite element analysis is done for design validation by two approach using motor solve. It is very difficult to make different lamination for each different rating of motor. It will increase cost of motor and also it requires time. In this paper induction motor lamination is used for design of PM motor .
1. INTRODUCTION In this paper PM motor for elevator application is designed by two approaches. In first approach rating of PM motor is calculated using below Torque and speed equation. And based on PM motor design calculation PM motor is design. So in this approach one have to manufacture special lamination for PM motor. This will increase money and time consumption. So to reduce money and time consumption one can design PM motor by fixing Main dimension like Stator outer Diameter and rotor outer diameter according to number of slot and available stator stamping in market. Here interesting things is that we can use induction motor stamping. By fixing above parameter and changing length and aspect ratio one can design PM motor which has same specification like same torque, speed, output power, efficiency and flux density etc. Hence in second approach after taking rating of PM motor One can directly design PM motor by fixing Stator outer Diameter and rotor outer diameter according to number of slot and available stator stamping in market. Only one condition should be satisfied that is ratio of length and aspect ratio must match with stator outer diameter.
1.1 Requirements of elevator systems The major requirements in the motor design of gearless elevator systems are torque and speed. These two parameters can be calculated by operating speed, cabin weight capacity, type of suspension and pulley diameter of designed elevator system For some given elevator specifications such as 680 kg (For 10 people) weight capacity, 1.5 m/s cabin velocity, 2: 1
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Impact Factor value: 5.181
Suspension ratio following motor requirements can be Calculated. Tmotor = [rpulley x g x (Mcarry) x η / μ]] Where, Rpulley: The radius of drive pulley (m) (0.12 m), g: The force of gravity (m/s2) (9.88 m/s2) Mcarry:
Maximum carrying capacity (kg) (680 kg) μ: The coefficient for suspension type. I for direct Suspension, 2 for 2: 1 suspension. Design was carried out for μ =2. η: Well and rope system efficiency (70%) Tmotor = [0.12 x 9.88x(680) x (0.7)/2 ] Tmotor = 279.88 N.m Motor rated speed; ω = μ x (v / rpulley) (rad/ s) v: cabin vertical velocity = 1.5 m/s ω = 2 x (1.5/ 0.12) = 25 (rad/s) n = ω x (60/2 x π) (rpm) n = 25 x (60/2 x π) = 238.8 (rpm) Rated power; Pmotor = T. ω Pmotor = 279.88 x 25 = 7000 W
1.2 Simple design of PM motor In first approach, conventional design method is carried out. In which first one has to calculate main dimension of PM motor and design that motor into motor solve software and match result with calculated output. So same processes is carried out below
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