Read Article - Elevator World Inc.
... PM AC gearless machines are synchronous motors and require no slip, so it is important that the relationship between the motor speed and frequency, as determined by the number of motor poles, is correct. This is one of the most important concepts when programming a variablefrequency drive, but is ge ...
... PM AC gearless machines are synchronous motors and require no slip, so it is important that the relationship between the motor speed and frequency, as determined by the number of motor poles, is correct. This is one of the most important concepts when programming a variablefrequency drive, but is ge ...
Is it the drive, the motor, or the load?
... constant torque Most drive systems are used with variable torque or constant torque loads. Variable torque loads include fans and rotary pumps. These are by far the majority of loads, from an energy consumption point of view. When ASDs are used with these loads, dramatic energy savings can be realiz ...
... constant torque Most drive systems are used with variable torque or constant torque loads. Variable torque loads include fans and rotary pumps. These are by far the majority of loads, from an energy consumption point of view. When ASDs are used with these loads, dramatic energy savings can be realiz ...
2011 Efficient Multiphysics Analysis of Drum Rollers Mircea Popescu INDUCTICA TECHNICAL CONFERENCE
... 3-phase induction motors are normally used as drum motors. A recent alternative are brushless synchronous permanent magnet motors. All 3 phase motors can be used together with a variable frequency converter drive. General system The drum roller system to be analysed consists of • a three-phase power ...
... 3-phase induction motors are normally used as drum motors. A recent alternative are brushless synchronous permanent magnet motors. All 3 phase motors can be used together with a variable frequency converter drive. General system The drum roller system to be analysed consists of • a three-phase power ...
... the supply current should be below 19%. A BLDC motor when fed by a diode bridge rectifier (DBR) with a high value of dc link capacitor draws peaky current which can lead to a THD of supply current of the order of 65% and power factor as low as 0.8. Hence, a DBR followed by a power factor corrected ( ...
Motor Efficiency and Power Factor
... Pure resistors have no imaginary component, so current and voltage are "in phase" if impedance consists only of resistance elements. Capacitance causes voltage to lead the current, i.e., V reaches maximum before current (leading). Inductive impedance causes current to lead voltage, i.e., the v ...
... Pure resistors have no imaginary component, so current and voltage are "in phase" if impedance consists only of resistance elements. Capacitance causes voltage to lead the current, i.e., V reaches maximum before current (leading). Inductive impedance causes current to lead voltage, i.e., the v ...
ENGR 6806 – Motor Control
... “Some of this stuff is theory… why is this guy wasting my time with that?” “I don’t have a clue what he’s talking ...
... “Some of this stuff is theory… why is this guy wasting my time with that?” “I don’t have a clue what he’s talking ...
Electrical Machines - Questions and Answers
... tends to be less on full volts than on reduced volts so the current and torque values tend to be rather less than those obtained by the formulae given. 33. How do the various methods of starting on reduced voltage compare as regards torque per ampere? Star-delta and auto-transformer methods have the ...
... tends to be less on full volts than on reduced volts so the current and torque values tend to be rather less than those obtained by the formulae given. 33. How do the various methods of starting on reduced voltage compare as regards torque per ampere? Star-delta and auto-transformer methods have the ...
Controlling stepper motors with MINI-MAX and PRO-MAX
... For detailed information about how stepper motors work, please refer to our Application Note AN9: Theory of stepper motor operation. Although micro-controllers can control stepper motors with precision and accuracy, stepper motors can not be connected to a microcontroller directly. Most stepper moto ...
... For detailed information about how stepper motors work, please refer to our Application Note AN9: Theory of stepper motor operation. Although micro-controllers can control stepper motors with precision and accuracy, stepper motors can not be connected to a microcontroller directly. Most stepper moto ...
Quick Reference - Motion Control Systems
... Specs: Open collector output. Outputs will sink up to 300mA, or source up to 5mA at 5-24VDC. Terminals found on multiple connectors +5V GND SHLD ...
... Specs: Open collector output. Outputs will sink up to 300mA, or source up to 5mA at 5-24VDC. Terminals found on multiple connectors +5V GND SHLD ...
Hardware Design Considerations for an Efficient
... The disadvantages of Hall Effect sensors listed in Section 2.2.1.1 are compensated for by using sensorless control. One of the ways of overcoming the disadvantages of Hall Effect sensors is by using back-EMF sensing. This method works because one coil is always de-energized according to the working ...
... The disadvantages of Hall Effect sensors listed in Section 2.2.1.1 are compensated for by using sensorless control. One of the ways of overcoming the disadvantages of Hall Effect sensors is by using back-EMF sensing. This method works because one coil is always de-energized according to the working ...
Theoretical developments
... BLDC motor with 8 poles and 12 slots used in hard disk drive Pulse of 12V is injected into all six segments of an electrical cycle whenever a rotor moves at an electrical angle of 8° ...
... BLDC motor with 8 poles and 12 slots used in hard disk drive Pulse of 12V is injected into all six segments of an electrical cycle whenever a rotor moves at an electrical angle of 8° ...
Induction Motor and Self-Excited Induction Generator
... numbers and has become the most important workhorse in industry. This article introduces the basic construction, operating principle, and major performance characteristics of three-phase squirrel-cage and slip-ring induction motors. Operational aspects, such as starting, electric braking, and speed ...
... numbers and has become the most important workhorse in industry. This article introduces the basic construction, operating principle, and major performance characteristics of three-phase squirrel-cage and slip-ring induction motors. Operational aspects, such as starting, electric braking, and speed ...
... e) Use the LINEST function in Excel to fit a line to your voltage and speed data. You must provide LINEST with a set of known x-values (in this case, the speed values) and a set of known y-values (in this case, the voltages). LINEST will return the slope of the line that best fits the data. In term ...
EDE1200 Unipolar Stepper Motor IC EDE1200
... (If a clockwise command causes counterclockwise rotation of motor, reverse the sequence of the motor’s four phase wires.) Half-Stepping (pin 8): 1 = normal stepping, 0 = half stepping (doubles step resolution) With the EDE1200 running at an external clock speed of 4 MHz, the 'STEP' pin may be driven ...
... (If a clockwise command causes counterclockwise rotation of motor, reverse the sequence of the motor’s four phase wires.) Half-Stepping (pin 8): 1 = normal stepping, 0 = half stepping (doubles step resolution) With the EDE1200 running at an external clock speed of 4 MHz, the 'STEP' pin may be driven ...
Shrink wrapping machines ［Wrapping machines］
... Harmonics can be avoided by installing an external "reactor". To decrease "harmonics", we recommend to install DC reactors in all our inverter models. (NOTE: 100V input models require AC reactors.) ...
... Harmonics can be avoided by installing an external "reactor". To decrease "harmonics", we recommend to install DC reactors in all our inverter models. (NOTE: 100V input models require AC reactors.) ...
Identifying Motor Defects Through Fault Zone Analysis
... although a small percentage of the motor problems, can influence other fault zones to fail. When a motor is started with a broken or cracked rotor bar, intense heat is generated around the vicinity of the break. This can spread to other rotor bars and destroy the insulation around the nearby laminat ...
... although a small percentage of the motor problems, can influence other fault zones to fail. When a motor is started with a broken or cracked rotor bar, intense heat is generated around the vicinity of the break. This can spread to other rotor bars and destroy the insulation around the nearby laminat ...
Minimising of electromagnetic torque ripple of reluctance stepper
... torque ripples are minimized by designing the machine such that the inductance profiles of two succeeding phases overlap each other with a constant shift. An alternative technique to reduce torque ripple can be change the shape of the excitation in communication interval. The model ignores saturati ...
... torque ripples are minimized by designing the machine such that the inductance profiles of two succeeding phases overlap each other with a constant shift. An alternative technique to reduce torque ripple can be change the shape of the excitation in communication interval. The model ignores saturati ...
DESIGN AND SIMULATION BY USING SMART POWER MODULE
... incorporated into the motor's protection and control schemes. In some smaller applications, a fan blade attached to the shaft often acts as an artificial load to limit the motor speed to a safe level, as well as a means to circulate cooling airflow over the armature and field windings. An advantage ...
... incorporated into the motor's protection and control schemes. In some smaller applications, a fan blade attached to the shaft often acts as an artificial load to limit the motor speed to a safe level, as well as a means to circulate cooling airflow over the armature and field windings. An advantage ...
fem analysis of a mo fem analysis of a motor-generator
... the two machines are separate, but in this case they have the same rotor armature. The advantage of this construction is that it behaves like an speed reducer, reducing the rotating speed of the combustion engine in a ratio of 2:1. The system can be used without a gearbox, if the motor is properly c ...
... the two machines are separate, but in this case they have the same rotor armature. The advantage of this construction is that it behaves like an speed reducer, reducing the rotating speed of the combustion engine in a ratio of 2:1. The system can be used without a gearbox, if the motor is properly c ...
Brushless DC electric motor
Brushless DC electric motor (BLDC motors, BL motors) also known as electronically commutated motors (ECMs, EC motors) are synchronous motors that are powered by a DC electric source via an integrated inverter/switching power supply, which produces an AC electric signal to drive the motor. In this context, AC, alternating current, does not imply a sinusoidal waveform, but rather a bi-directional current with no restriction on waveform. Additional sensors and electronics control the inverter output amplitude and waveform (and therefore percent of DC bus usage/efficiency) and frequency (i.e. rotor speed).The rotor part of a brushless motor is often a permanent magnet synchronous motor, but can also be a switched reluctance motor, or induction motor.Brushless motors may be described as stepper motors; however, the term stepper motor tends to be used for motors that are designed specifically to be operated in a mode where they are frequently stopped with the rotor in a defined angular position. This page describes more general brushless motor principles, though there is overlap.Two key performance parameters of brushless DC motors are the motor constants Kv and Km.