Asynchronous electric motors for variable-frequency electric drives of drilling rigs

Operation peculiarities of the main drilling rig mechanisms are considered. The key specification requirements to asynchronous variable-frequency electric motors of the main drives are presented. The possibility of designing and developing the batch production of competitive, domestically produced drilling electric motors at enterprises of RUSELPROM concern is grounded.     

The preliminary selection of motors for geared elevator hoist drives

A technique of the preliminary selection of an electric motor for geared elevator hoist drives is proposed. Examples of selecting electric motors for different elevator types are given.     

电压型逆变器供电的异步电动机转矩的分析与计算

由于电压型逆变器输出的电压和电流波形中含有大量谐波,使异步电动机低速时的转矩脉动,转速波动。文中采用频域法推导了PWM型逆变器供电时,异步电动机转矩的计算公式,并就其中的恒定转矩和谐波转矩分量进行了分析,对一台2．2KW,SPWM电压源逆变器供电的三相异步发动机低频稳态时的转矩计算和实验结果进行了比较,结果较接近,在已矩逆变器输出电压波形和电机参烤的情况下,利用本方法计算电机输出转矩,方法简单实用。     

Electric drives based on induction motors with individual compensations for reactive power intended for draw benches

Power-saving electric drives created by modernizing traditional three-phase induction motors for draw benches are presented. Power-saving induction motors have cos φ = 1.0 and power efficiency η_p = 80–90%. Each kilowatt of rated power of an energy-saving induction motor makes it possible to save approximately 300–750 kW h of electric power per year.     

Electric motors for drives of modern locomotive auxiliaries

The results of the development of induction motors for ventilator and compressor drives of modern electric and diesel locomotives are presented. Operating parameters, conditions, and technical motor data are given.     

Basic principle and maximum torque characteristics of a six-phase pole change induction motor for electric vehicles

In addition to basic characteristics such as small size, lightweight and easy maintenance, the electric vehicle (EV) motor is required to possess characteristics that allow for the production of high torque in low-speed region and to realize a wide-speed range of constant power in high-speed region. In an attempt to improve further the constant power operation of the induction motor (IM), this paper proposes a six-phase pole change IM (six-phase PCIM). The six-phase PCIM further expands the constant power operation range without increasing either volume or current of IM. To clarify the basic principle and torque characteristics of the six-phase PCIM, its winding method and distribution of magnetomotive force (mmf) will first be examined. Then, by establishing a performance calculation method based on a quasisinusoidal wave method, the feasibility of a highly precise performance calculation sufficient for actual use will be demonstrated. Furthermore, by clarifying through experiment the maximum torque characteristics, the feasibility of expansion of the constant power operation range will be confirmed and its effectiveness in the EV will be discussed. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 118 (3): 78–91, 1997     

Electromagnetic noise of induction motors driven by PWM inverters

When a squirrel cage induction motor is driven by a PWM inverter, electromagnetic noise different from that during commercial power source drive is experienced. This is because of sideband wave voltage induced in PWM inverter output voltage. This paper first describes the mechanism of electromagnetic noise generation in commercial power source drive, and then electromagnetic force considering the sideband frequency and voltage content and the mechanism of electromagnetic noise generation in PWM inverter drive. It also refers to the sideband frequency and voltage content because of operating time control. © 2000 Scripta Technica, Electr Eng Jpn, 133(3): 55–62, 2000     

Modified direct torque control method for induction motor drives based on amplitude and angle control of stator flux

This paper proposes design and implementation of a direct torque controlled induction motor drive system. The method is based on control of separation between amplitude and angle of reference stator flux for determining reference stator voltage vector in generating PWM output voltage for induction motors. The objective is to reduce electromagnetic torque ripple and stator flux droop which result in a decrease in current distortion in steady-state condition. In addition, the proposed technique provides simplicity of a control system. The direct torque control is based on the relationship between instantaneous slip angular frequency and rotor angular frequency in adjustment of the reference stator flux angle. The amplitude of the reference stator flux is always kept constant at rated value. The system has been implemented to verify its capability such as torque and stator flux responses, stator phase current distortion both during dynamic and steady state with load variation, and low speed operation.     

基于人工神经网络的交流感应电机控制系统

讨论了用径向基函数网络(radialbasisfunction,简称RBF)方法所设计的交流异步电机直接转矩控制系统的自适应电机的u-n模型。该模型实时性好,能够克服电机在低速状态下定子电阻的变化及参数变化所带来的影响。仿真表明所设计的系统具有良好的控制性能。     

电动汽车电机驱动系统寿命模型

针对电动汽车电机驱动系统在运行过程中承受剧烈的热应力容易导致系统出现故障的问题,从热应力疲劳失效的观点出发,分析了系统寿命影响因素及其薄弱环节的失效机理,提出了一种以电动汽车电机驱动系统运行工况和电机输出扭矩为输入建立系统寿命模型的方法。建立了100/160 kW纯电动大客车电机驱动系统寿命模型,并以北京121电动公交车的实际运行工况为模型输入预计了系统寿命。     

Formation of smooth transient processes during mode switching in automatic electric drives

A new method that allows one to switch the operational modes (start, speedup, retardation, reverse, steady state, stop) of an automatic electric drive has been developed. It is shown how to calculate the control voltage for the dc motor; the results of simulation are presented.     

ADTR-motor drive for electric vehicle

A new motor (ADTR-motor: Anti-Directional Twin Rotary Motor) for electric vehicle drive is proposed. A stator in a conventional motor is reformed to be movable, and the stator (outer rotor) and the rotor (inner rotor) rotate in anti-directions. The IM-type ADTR-motor and the SM-type ADTR-motor are considered, and in this paper a prototype of the IM-type ADTR-motor is constructed experimentally. When the ADTR-motor is used for an EV drive, the direction of one of the rotors should be reversed. Both rotors, when rotated in the same direction, propel the two wheels of EV. The torque of the wheels can be balanced without differential gear. The fundamental characteristics of ADTR-motor are clarified. The characteristics are the structure of ADTR-motor, the equivalent circuit parameters, the torque balance theory, the torque-speed characteristics, the rotor speed transient characteristics, and the transient response under the speed sensorless torque control.     

An automatic torque ripple compensation system for direct drive motors

A serious problem in motion control is the occurrence of torque ripple. Since a direct drive (DD) motor with a magnet rotor uses a rare-earth magnet, the torque ripple is more serious than that of conventional servomotors. This paper presents an auto-compensation of torque ripple using a software-implemented torque observer. The frequency and amplitude of torque ripple can be obtained in the controller by using the estimated torque from an observer, and the autonomous generation of a compensating current component for a torque ripple is possible. The proposed algorithm has been verified by experiments.     

转速小振荡时感应电动机的电磁转矩

建立了转速小振荡时感应电动机的电压方程、电磁转矩和转矩方程，导出了异步转矩和阻尼转矩系数。实例计算和分析了一台30kW的三相感应电动机在转速小振荡时的电磁转矩，并得到了一些有用的结论。     

Identification of plant model of linear induction motors for a traction system intended for use in a high‐performance controller

A linear induction motor (LIM) is suitable for use in trains. The motor can be used in both wheel‐suspended and contact‐less types such as the Linear Metro and HSST trains in Japan. The LIM has end winding as well as asymmetrical winding. The end effect is a major problem in the LIM, and it makes the analysis, design, and control of motors difficult. This paper describes a method that combines numerical analysis and the equivalent circuit for the LIM in order to design a high‐performance controller for the LIM that includes the end effect. A sample basic field‐oriented control scheme that is based on the plant model is applied to the LIM in order to check the control performance. The theory of rotary induction motors is used for verification. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 179(2): 44–54, 2012; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21171     

一种新的异步电动机调速系统的混合控制方法

矢量控制(FOC)和直接转矩控制(DTC)是目前高性能异步电动机调速系统中的两种主要控制方法.研究和工程实践表明,这两种方法各有优缺点,国内外很多学者也提出了很多方案,试图改进和完善这两种控制方法.本文从全新的思路出发,尝试把这两种方法结合到一个控制系统中,取长补短,形成一种新的混合控制方法.该方法使用户可以根据实际运行的不同需要,在线灵活地切换到合适的控制方法(FOC或DTC),以提高控制性能.为了实现两种控制方法之间的平滑切换,本文把传统的PI控制器改造成可重置PI控制器.仿真和实验结果表明,这种可重置PI控制器可以有效减少FOC和DTC切换时造成的系统波动,同时能保持原有控制系统的性能,提高了本文提出的混合控制方法的实用价值.     

高磁负荷单相无刷直流电机的转矩波动抑制

在具有较高磁负荷的单相无刷直流电动机中,不均匀气隙结构以及通常存在的电流尖峰将导致尖峰定位转矩的产生,从而造成合成转矩特性的严重畸变。该文在稳态运动磁场计算及场路耦合计算的基础上,分析了气隙渐变结构中各结构要素对定位转矩峰值的影响及合理设计,并研究了各种驱动模式对转矩特性的影响,提出了采用有限转角的电压驱动模式降低转矩波动及噪声。样机试验表明,采用一定的关断角度可以有效降低电机噪声及提高性能。     

基于增强型STM32驱动双极步进电机的研究

针对双极步进电机的控制特点,充分利用增强型STM32在电机控制中的优势,提出基于STM32的双极步进电机驱动方案。对该系统的硬件电路和软件流程进行分析和设计,并最终将其应用到实际的电脑横机工作环境中,通过调整协调步进电机的参数,实现了电机驱动的紧凑、高速和低成本的目标。验证表明该系统具有较高稳定性和可靠性,达到了预定的要求。     

先进控制在异步电动机直接转矩控制中的应用

为提高直接转矩定子磁链的观测精度 ,给出了一种新的自适应定子磁链观测器的设计方案 ,它采用正实误差模型下的参数调节率 ,该方案不依赖于定子电阻。最后给出实例 ,仿真结果表明了设计方法的有效性     

Strategy for developing an electromagnetic core for induction electric motors of energy-efficient lineups

The factors that determine the energy efficiency of an induction electric motor are listed. A strategy for developing a lineup of energy-efficient induction electric motors (IEM) is developed. Criteria for optimizing an electromagnetic core in an energy-efficient IEM are formulated. Actual results of the development of the first Russian lineup of energy-efficient IEMs are given.