Page 238 - Servo Motors and Industrial Control Theory -

Index 237

Potentiometer, 73 Static friction, 115, 129, 141
Power ratio, 121, 147, 148 Steady state error, 43, 46–48
Power unit, 70, 71 Stepping motors, 91, 92, 95–98, 148, 150,
properties of, 83–85 153, 155
types of, 66 Stepping servo motors, 148, 151
Power Unit, 65 dynamic response characteristic, 96, 97
Pressure drop, 134, 137 principal operation, 91
Principle of superposition, 70–72, 75, 82, 116 speed–torque characteristic behavior, 97
Proportional+Integral+derivative (PID), 43, stepping motors with small step angle,
49, 89 92, 93
Pulse Width Modulated unit (PWM), 66, 87, torque–displacement characteristic of a,
88, 110, 150 94, 96
Step rotation of the motor See Stepping
R motors, 92
Radial shear, 132 Synchronous reluctance motor, 101
Ramp input, 72, 145
Rare earth magnet DC motors, 148, 151, 153 T
Rare earth permanent magnet, 65 Tacho generator, 45
Reactance, 103 Third order transfer function, 36, 49, 57, 59
Root Locus technique, 19–22, 28, 75 Three phase squirrel cage type motors, 101
Roots of the characteristic equation, 77, 78, Thyristor, 66, 83, 85, 87, 88, 108–110, 150
81, 130 Torque constant, 68, 69, 95, 96
Rotary inertia See Rotor inertia, 73 Torque equation, 99, 106, 124, 129
Rotating frequency converter, 108 Torque response, 141
Rotating velocity, 148 Torque transducer, 140
Rotor inertia, 43, 66, 75, 97, 125 Transient behavior, 137
Rotor resistance, 74, 103 Transient response, 17, 18, 44, 47, 49, 56, 71,
Rounding off error, 81 130, 145
Routh-Hurwitz method, 18, 44 Transmission mechanism, 49, 72, 74, 75, 78,
125, 126
S Transport lag, 31, 141
Saturations and nonlinearities Trial and error strategy, 58
limitations of, 63
Second-order transfer function, 118, 121, 129 V
Servo motor Variable dampers based shear mode, 133, 134
choice and comparison of, 143–153, 155, Velocity drop, 125, 127, 139, 146, 152, 155
156, 158 Velocity feedback, 45, 69, 72, 74, 75, 89, 99,
exercise problems on, 113 124, 145, 154, 159
for particular applications, 37, 65 Velocity transducer, 159
induction AC, 144, 147, 150 Velocity variation, 146, 147, 152
Settling time, 145–147, 149–152, 158 Viscous damping, 77
Shaft revolution, 91 Viscous friction, 69, 77, 118, 119
Shear mode, 131, 140–142 Voltage drop, 108
Shear stress, 131, 132, 134 Voltage equation, 68, 72, 74, 80, 97, 98, 103,
Slip ratio 107, 108, 113, 124
function of, 105
Speed torque characteristic, 68, 69 W
Spool valve, 115–120, 128, 129 Windage friction, 102
State variable feedback control strategy, 62,
75, 77, 79, 144 Z
State variable feedback control theory, 56–60 Zero steady state error, 43, 83, 145, 154
Static conversion methods, 108