CHAPTER 9 Problem 19 Compute the mechanical efficiency of a motor with an overall efficiency of 85% and a volumetric efficiency of 95%.
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CHAPTER 9 Problem 19
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- B: A motor drives a hoist which raises a load of 1000 kg with a velocity of 1 m/sec, calculate the input power of the motor assuming the hoist gearing efficiency to be 0.8, motor efficiency to be 0.75.Question 5 The blower requires 20 kW to run at 350 rpm. The power is transmitted by a v-belt shown in Figure 4 from an electric motor. The diameter of the machine pulley is 650 mm and that of the motor pulley is 330 mm. The centre distance between the pulleys is 1.2 m. The contact angle of the belt is 150°. The safe pull in each belt is 900 N and the mass of the belt is 0.46 kg per meter length. The coefficient of friction between the belt and the pulley is 0.25. The belt should not exceed the speed of 1 800 m/min. X1 = 16 mm H= 6 mm B X2 = 7 mm Figure 4: Cross sectional view of the v-belt 5.1. Calculate the velocity of the belt in m/s. Determine the length of the belt. Calculate the belt tensions. 5.2. 5.3.Question 2 Beli vifth Slack side Motor (imprut) Tight side Beli thickpess\ Centre distance Figure 2 Figure 2 shows an open flat belt drive connected to a motor and a pulley. The motor transmits 20 kw to the connect pulley of 450 mm diameter and is rotating at 850 r/min to a second pulley rotating at 400 r/min. The distance between pulley centres is approximately 2 m. The belt is 6 mm thick and has a density of 970 kg/m. The maximum stress in the belt is not to exceed 2,7 MPa. The coefficient of friction for both pulleys is 0,3. Determine: 2.1. The diameter of the second pulley. 2.2. The length of the belt. 3.3. The width of the belt taking centrifugal tension into account.
- A motor drives a hoist which raises a load of 1000 kg with a velocity of 1 m/sec, calculate the input power of the motor assuming the hoist gearing efficiency to be 0.8, motor efficiency to be 0.75 .1: Determine a suitable capacity of a continuous rated motor for the following duty cycle: 100 kW for 5 minute, 20 kW for 10 minutes, then remain 5 minute at no load, the duty cycle is repeated indefinitely. Draw the load cycle.Use image below  SOLVE CAREFULLY!! Please Write Clearly and Box the final Answer Remember it says The motor efficiency is 93 percent 
- the figure shows a motor driving a two-output transmission system. The blower requires a certain amount of force to operate since the drum rotates at an angular acceleration of 0.03 rad/s2. Determine the torque produced by a motor with a torque of 700 Nm and a speed of 1,600 rpm. following:- The power produced at the drum (P). The torque requirement for the blower to operate (Tblower) and power generation (Pblower) The overall efficiency transmission of the gear system, hO. If the speed of motor is NOT given, explain without calculation how the overall efficiency transmission of the gear system can be obtained. Given:- Number of gear teeth, t:- t1=40 ; t2=200 ; t3=50 ; t4=200 ; t5=40 ; t6=120 ; t7=60 and t8=120 Equivalent mass moment of inertia, Ieq:- Imotor,5=25 kgm2 ; I23=10 kgm2 ; Iblower,4=15 kgm2 ; I67=20 kgm2 and Idrum,8=60 kgm2 Friction torque in bearing, Fb:- A=F=25 Nm ; I=J =20 Nm ; B=C=G=H=5 Nm and D=E=10 Nm Efficiency of all gear mesh, ⴄ=85%A 7,5 kW electric motor (star-delta start) running at the speed of 900 r/min is to drive a laundry machine, which operates 12 hours per day, by means of a simplex chain drive. The laundry machine must run at approximately speed of 308 r/min. Based on the space restrictions, the center-line distance is limited to 400 mm. Specify the length of chain (in mm) to be used as well as the exact center-line distance. Note that the form of lubrication used is TPYE 2.The BAPCO in Bahrain is looking to design a V belt drive system for its recently installed rotary machines. The smaller pulley having a diameter of * d" is connected to an electric motor and run at a speed of nd. The belt is used to drive a larger pulley at a speed of 90 rpm. The V belt is used to transmits a power of 95 hp and ignore it in belt class selection process (Table 17.9). The service factor for the V belt drive system is 1.3 and the suggested factor of safety for the current design is 2.5. Smaller Pulley Diameter = d = 9 in Speed of smaller pulley = nd = 900 rpm Design and select a V belt drive system.
- What solid-state device is generally used to produce variable frequency in drives designed to control motors up to 500 HP?Homework 2 An armature controlled D.C motor runs at 5000 rpm when 15v applied at the armature circuit. Armature resistance of the motor is 0.2 , armature inductance is negligible, back emf constant is 5.5x10-² v sec/rad, motor torque constant is 6x10-5, moment of inertia of motor 10-5, viscous friction coefficient is negligible, moment of inertia of load is 4.4x10-3, viscous friction coefficient of load is 4x10-². R₂ La m 1. 2. ea 15 v eb T mmmm Bm @ V=constant N₁ BL DE @OL Drive the overall transfer function of the system i.e. ₁(s)/ E₂(s) Determine the gear ratio such that the rotational speed of the load is reduced to half and torque is doubled.Problem 5 1. Where and why is a centrifugal switch used in a split-phase motor? 2. Why and where is a capacitor used in the single-phase AC motor? 3. What type of motor would you select to perform each of the following jobs? (a) Electric drill: (b) Refrigerator: (c) Hair driers and desk fans: (d) Air Conditioner Fan: (e) XY plotters and printers: (f) Electric clock: