Voltage control of Induction Motor
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This presentation describes the Line Voltage Control - Torque Speed Characteristics - Methods -Advantages - Disadvantages - Applications of Voltage control
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Advanced motion controls be25a20fac
The document describes an analog servo drive called the BE25A20FAC. It has the following key specifications:
- It can deliver up to 25A of peak current and 12.5A of continuous current from a 30-130V AC power supply.
- It is designed to drive brushless DC motors and features four quadrant regenerative operation, adjustable current limits, and selectable operating modes including current, open loop, and encoder velocity modes.
- It provides motor commutation from hall sensors or an encoder, and supports feedback from halls, encoders, or a tachometer.
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Advanced motion controls sr60a40ac
The SR60A Series document describes brushless servo amplifiers that can drive 3-phase brushless motors. Key features include small size, surface mount technology, optical isolation, DIP switch selectable modes, regenerative operation, and fault protection. The amplifiers interface with motion controllers or can operate standalone, and require only a single DC power supply. Connector pinouts, switch functions, and operating modes are defined to help with setup and configuration.
Advanced motion controls sr60a40
The SR60A Series document describes brushless servo amplifiers that can drive 3-phase brushless motors. Key features include small size, surface mount technology, optical isolation, DIP switch selectable modes, regenerative operation, and fault protection. The amplifiers interface with motion controllers or can operate standalone, and require only a single DC power supply. Connector pinouts, switch functions, and operating modes are defined to help with setup and configuration.
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stepper motors
There are three main types of stepper motors: variable reluctance, permanent magnet, and hybrid. Variable reluctance stepper motors use changes in magnetic reluctance to rotate and can be single or multi-stack. They provide high torque but have torque ripple issues. Permanent magnet stepper motors use permanent magnets on the rotor and have bipolar drive circuits. They can achieve a 45 degree step angle through alternate single and two phase excitation. Hybrid stepper motors combine features of variable reluctance and permanent magnet motors, with a 4 pole stator and 5 pole rotor construction. Each motor type has advantages and disadvantages related to torque, torque ripple, and drive circuit complexity.
PMBLDC motors
1) The document discusses permanent magnet brushless DC (PMBLDC) motors and their control. It explains that the desired current waveform for each phase must be estimated based on the instantaneous rotor position to satisfy the maximum torque at minimum current principle.
2) The desired current is provided to the phases through driver circuits containing six transistors, which are switched on based on whether the desired current is positive or negative.
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1) For alternators to operate in parallel, they must be synchronized by having equal line voltage, frequency, phase sequence, phase angle, and waveform.
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The growing significance of portable systems to limit power consumption in ultra-large-scale-integration chips of very high density, has recently led to rapid and inventive progresses in low-power design. The most effective technique is adiabatic logic circuit design in energy-efficient hardware. This paper presents two adiabatic approaches for the design of low power circuits, modified positive feedback adiabatic logic (modified PFAL) and the other is direct current diode based positive feedback adiabatic logic (DC-DB PFAL). Logic gates are the preliminary components in any digital circuit design. By improving the performance of basic gates, one can improvise the whole system performance. In this paper proposed circuit design of the low power architecture of OR/NOR, AND/NAND, and XOR/XNOR gates are presented using the said approaches and their results are analyzed for powerdissipation, delay, power-delay-product and rise time and compared with the other adiabatic techniques along with the conventional complementary metal oxide semiconductor (CMOS) designs reported in the literature. It has been found that the designs with DC-DB PFAL technique outperform with the percentage improvement of 65% for NOR gate and 7% for NAND gate and 34% for XNOR gate over the modified PFAL techniques at 10 MHz respectively.
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【主营项目】
一.毕业证【微信：176555708】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【微信：176555708】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分→ 【关于价格问题（保证一手价格）
我们所定的价格是非常合理的，而且我们现在做得单子大多数都是代理和回头客户介绍的所以一般现在有新的单子 我给客户的都是第一手的代理价格，因为我想坦诚对待大家 不想跟大家在价格方面浪费时间
对于老客户或者被老客户介绍过来的朋友，我们都会适当给一些优惠。
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
选择实体注册公司办理，更放心，更安全！我们的承诺：可来公司面谈，可签订合同，会陪同客户一起到教育部认证窗口递交认证材料，客户在教育部官方认证查询网站查询到认证通过结果后付款，不成功不收费！
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politics, and conventional and nontraditional security are all explored and explained by the researcher.
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Voltage control of Induction Motor
- 1. NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA) TYPES OF SQUIRREL CAGE IM • CLASS A- LOW STARTING TORUE (Tst – A) • CLASS B – CONSTANT SPEED DRIVES • CLASS C & D– HIGH STARTING TORQUE (Tst – C & Tst – D) • CLASS E – HIGH EFFICIENCY (Low Slip Region) Tst - A Tst - B Tst - C Tst - D SPEED (N) TORQUE SPEED CONTROL METHODS OF INDUCTION MOTOR SLIP (S) 0 1 Ns 0 VERY IMPORTANT NOTE High rotor resistance High Starting Torque Tst Low Slip (for wide range Torque) High efficiency
- 2. SPEED CONTROL METHODS OF INDUCTION MOTOR 1) Line voltage control 2) Line frequency control Variable frequency constant voltage Voltage/Frequency control (V/F) Voltage Source Inverter fed induction motor drive Current Source Inverter fed induction motor drive 3) Rotor resistance control 4) Slip power recovery scheme Why Induction motor? Six Step Pulse Width Modulation (PWM) – Rugged construction (no commutators) & availability of solid state controllers Used only in slip ring induction motor
- 3. 1) LINE VOLTAGE CONTROL INDUCTION MOTOR FAN LOAD TORQUE SPEED Variable Three Phase Stator Voltage (Vs) • EASIEST METHOD • ECONOMICAL TORQUE SPEED 25% Vs 50% Vs 75% Vs 100% Vs N1 N2 N3 N4 NEMA CLASS D CAN BE SUITABLE TO GET WIDE SPEED RANGE SPEED RANGE Ns0 SPEED TORQUE
- 4. TORQUE- SPEED CHARACTERISTICS OF VOLTAGE CONTROL How to change the “voltage”? (Implementation) Method 1 Method 2 - Using “Auto transformer” - Variation is smooth - O/P -> Sinusoidal voltage - Using “Solid State Controllers” - O/P –> Non Sinusoidal !! - Input Filter required – Large Applns By changing the “Firing angle - alpha”
- 5. 2. Actual Rotor Speed N 4. Error = N*- N 5.Firing angle 6. Voltage Method 3 – Using Solid State Controllers -- Closed loop 1. Desired Rotor speed N* -+3. Error Generator “Used when Precise speed Control is required” Manual Speed setting Potentiometer! INPUT VOLTAGE OUTPUT VOLTAGE T1 T2 • Turn Off Time (T.Off) thinner • So AVG V (1/2 cycle)= greater! • Turn off time (T.Off) larger • So AVG V (1/2 cycle) = smaller! Controller Speed sensor g1 g2 A K AK + - + - - + T1 α 30 T.Off T2 α 180 +30 T1 T2 T.Off α 180 +60
- 6. TORQUE- SPEED CHARACTERISTICS OF VOLTAGE CONTROL • EASIEST • ECONOMICAL • INCREASE THE SPEED RANGE WITH CLASS D MOTORS • SLIP ∝ (Ns-N) IS HIGH @ LOW SPEEDS – SO, LOW EFFICIENCY NOTE “SYNCHRONOUS SPEED “Ns” IS NOT CHANGING” • FANS • PUMPS • CENTRIFUGAL DRIVES APPLICATIONS SLIP SPEED RANGE