The Experts below are selected from a list of 117 Experts worldwide ranked by ideXlab platform

C C Chan - One of the best experts on this subject based on the ideXlab platform.

  • novel permanent magnet motor drives for electric vehicles
    IEEE Transactions on Industrial Electronics, 1996
    Co-Authors: C C Chan, J Z Jiang, K T Chau, W Xia, Meiling Zhu, R Zhang
    Abstract:

    Novel permanent magnet (PM) motor drives have been successfully developed to fulfil the special requirements for electric vehicles such as high power density, high efficiency, high starting torque, and high cruising speed. These PM motors are all brushless and consist of various types, namely rectangular-fed, sinusoidal-fed, surface-magnet, buried-magnet, and hybrid. The advent of novel motor configurations lies on the unique electroMagnetic topology, including the concept of multipole Magnetic circuit and full slot-pitch coil span arrangements, leading to a reduction in both Magnetic Yoke and copper, decoupling of each phase flux path, and hence an increase in both power density and efficiency. Moreover, with the use of fractional number of slots per pole per phase, the cogging torque can be eliminated. On the other hand, by employing the claw-type rotor structure and fixing an additional field winding as the inner stator, these PM hybrid motors can further provide excellent controllability and improve efficiency map. In the PM motors, by purposely making use of the transformer EMF to prevent the current regulator from saturation, a novel control approach is developed to allow for attaining high-speed constant-power operation which is particularly essential for electric vehicles during cruising. Their design philosophy, control strategy, theoretical analysis, computer simulation, experimental tests and application to electric vehicles are described.

  • a novel polyphase multipole square wave permanent magnet motor drive for electric vehicles
    IEEE Transactions on Industry Applications, 1994
    Co-Authors: C C Chan, J Z Jiang, Guihai Chen, X Y Wang, K T Chau
    Abstract:

    A novel high-power-density permanent magnet (PM) motor drive for electric vehicles (EVs) is proposed. The motor is a polyphase multipole square-wave PM motor, which can be classified as a kind of PM brushless DC motor. The distinct features of the proposed motor as compared to those of the conventional PM brushless DC motor are as follows. First, the multipole Magnetic circuit arrangement enables the minimization of the Magnetic Yoke, resulting in the reduction of motor volume and weight. Second, the coil span is purposely designed to be equal to one slot pitch, thus saving the amount of copper used. Third, by using a fractional number of slots per pole per phase, the arrangement of the numbers of poles and slots is so unique that the Magnetic force between the stator and the rotor at any rotating position is uniform, hence eliminating the cogging torque that usually occurs in PM motors. Finally, the motor can be controlled to operate at a constant torque region and a constant power region with field weakening, thus both high starting torque and high cruising speed can be achieved. Therefore, as the proposed motor drive possesses the distinct advantages of high power density, high efficiency, and superior dynamic performance, it is very suitable for EV applications. A prototype of a five-phase 22-pole 5 kW motor drive has been designed for an experimental EV. >

  • a novel polyphase multipole square wave permanent magnet motor drive for electric vehicles
    Applied Power Electronics Conference, 1993
    Co-Authors: C C Chan, J Z Jiang, Guihai Chen, X Y Wang, K T Chau
    Abstract:

    A novel high power density permanent magnet (PM) motor drive for electric vehicles (EVs) is proposed. The motor is a polyphase multiple square-wave PM motor, which can be classified as a kind of PM brushless DC motor. The features of the proposed motor as compared with those of the conventional PM brushless DC motor. The multipole Magnetic circuit arrangement permits the minimization of Magnetic Yoke, resulting in the reduction of motor volume and weight. The coil span is purposely designed to be equal to one slot pitch, thus saving in copper used. By using a fractional number of slots per pole per phase, the arrangement of numbers of poles and slots is so unique that the Magnetic force between stator and rotor at any rotating position is uniform, hence eliminating the cogging torque which usually occurs in PM motors. The motor can be controlled to operate at constant torque region and constant power region with field weakening. Thus, both high starting torque and high cruising speed can be achieved. >

K T Chau - One of the best experts on this subject based on the ideXlab platform.

  • novel permanent magnet motor drives for electric vehicles
    IEEE Transactions on Industrial Electronics, 1996
    Co-Authors: C C Chan, J Z Jiang, K T Chau, W Xia, Meiling Zhu, R Zhang
    Abstract:

    Novel permanent magnet (PM) motor drives have been successfully developed to fulfil the special requirements for electric vehicles such as high power density, high efficiency, high starting torque, and high cruising speed. These PM motors are all brushless and consist of various types, namely rectangular-fed, sinusoidal-fed, surface-magnet, buried-magnet, and hybrid. The advent of novel motor configurations lies on the unique electroMagnetic topology, including the concept of multipole Magnetic circuit and full slot-pitch coil span arrangements, leading to a reduction in both Magnetic Yoke and copper, decoupling of each phase flux path, and hence an increase in both power density and efficiency. Moreover, with the use of fractional number of slots per pole per phase, the cogging torque can be eliminated. On the other hand, by employing the claw-type rotor structure and fixing an additional field winding as the inner stator, these PM hybrid motors can further provide excellent controllability and improve efficiency map. In the PM motors, by purposely making use of the transformer EMF to prevent the current regulator from saturation, a novel control approach is developed to allow for attaining high-speed constant-power operation which is particularly essential for electric vehicles during cruising. Their design philosophy, control strategy, theoretical analysis, computer simulation, experimental tests and application to electric vehicles are described.

  • a novel polyphase multipole square wave permanent magnet motor drive for electric vehicles
    IEEE Transactions on Industry Applications, 1994
    Co-Authors: C C Chan, J Z Jiang, Guihai Chen, X Y Wang, K T Chau
    Abstract:

    A novel high-power-density permanent magnet (PM) motor drive for electric vehicles (EVs) is proposed. The motor is a polyphase multipole square-wave PM motor, which can be classified as a kind of PM brushless DC motor. The distinct features of the proposed motor as compared to those of the conventional PM brushless DC motor are as follows. First, the multipole Magnetic circuit arrangement enables the minimization of the Magnetic Yoke, resulting in the reduction of motor volume and weight. Second, the coil span is purposely designed to be equal to one slot pitch, thus saving the amount of copper used. Third, by using a fractional number of slots per pole per phase, the arrangement of the numbers of poles and slots is so unique that the Magnetic force between the stator and the rotor at any rotating position is uniform, hence eliminating the cogging torque that usually occurs in PM motors. Finally, the motor can be controlled to operate at a constant torque region and a constant power region with field weakening, thus both high starting torque and high cruising speed can be achieved. Therefore, as the proposed motor drive possesses the distinct advantages of high power density, high efficiency, and superior dynamic performance, it is very suitable for EV applications. A prototype of a five-phase 22-pole 5 kW motor drive has been designed for an experimental EV. >

  • a novel polyphase multipole square wave permanent magnet motor drive for electric vehicles
    Applied Power Electronics Conference, 1993
    Co-Authors: C C Chan, J Z Jiang, Guihai Chen, X Y Wang, K T Chau
    Abstract:

    A novel high power density permanent magnet (PM) motor drive for electric vehicles (EVs) is proposed. The motor is a polyphase multiple square-wave PM motor, which can be classified as a kind of PM brushless DC motor. The features of the proposed motor as compared with those of the conventional PM brushless DC motor. The multipole Magnetic circuit arrangement permits the minimization of Magnetic Yoke, resulting in the reduction of motor volume and weight. The coil span is purposely designed to be equal to one slot pitch, thus saving in copper used. By using a fractional number of slots per pole per phase, the arrangement of numbers of poles and slots is so unique that the Magnetic force between stator and rotor at any rotating position is uniform, hence eliminating the cogging torque which usually occurs in PM motors. The motor can be controlled to operate at constant torque region and constant power region with field weakening. Thus, both high starting torque and high cruising speed can be achieved. >

J Z Jiang - One of the best experts on this subject based on the ideXlab platform.

  • novel permanent magnet motor drives for electric vehicles
    IEEE Transactions on Industrial Electronics, 1996
    Co-Authors: C C Chan, J Z Jiang, K T Chau, W Xia, Meiling Zhu, R Zhang
    Abstract:

    Novel permanent magnet (PM) motor drives have been successfully developed to fulfil the special requirements for electric vehicles such as high power density, high efficiency, high starting torque, and high cruising speed. These PM motors are all brushless and consist of various types, namely rectangular-fed, sinusoidal-fed, surface-magnet, buried-magnet, and hybrid. The advent of novel motor configurations lies on the unique electroMagnetic topology, including the concept of multipole Magnetic circuit and full slot-pitch coil span arrangements, leading to a reduction in both Magnetic Yoke and copper, decoupling of each phase flux path, and hence an increase in both power density and efficiency. Moreover, with the use of fractional number of slots per pole per phase, the cogging torque can be eliminated. On the other hand, by employing the claw-type rotor structure and fixing an additional field winding as the inner stator, these PM hybrid motors can further provide excellent controllability and improve efficiency map. In the PM motors, by purposely making use of the transformer EMF to prevent the current regulator from saturation, a novel control approach is developed to allow for attaining high-speed constant-power operation which is particularly essential for electric vehicles during cruising. Their design philosophy, control strategy, theoretical analysis, computer simulation, experimental tests and application to electric vehicles are described.

  • a novel polyphase multipole square wave permanent magnet motor drive for electric vehicles
    IEEE Transactions on Industry Applications, 1994
    Co-Authors: C C Chan, J Z Jiang, Guihai Chen, X Y Wang, K T Chau
    Abstract:

    A novel high-power-density permanent magnet (PM) motor drive for electric vehicles (EVs) is proposed. The motor is a polyphase multipole square-wave PM motor, which can be classified as a kind of PM brushless DC motor. The distinct features of the proposed motor as compared to those of the conventional PM brushless DC motor are as follows. First, the multipole Magnetic circuit arrangement enables the minimization of the Magnetic Yoke, resulting in the reduction of motor volume and weight. Second, the coil span is purposely designed to be equal to one slot pitch, thus saving the amount of copper used. Third, by using a fractional number of slots per pole per phase, the arrangement of the numbers of poles and slots is so unique that the Magnetic force between the stator and the rotor at any rotating position is uniform, hence eliminating the cogging torque that usually occurs in PM motors. Finally, the motor can be controlled to operate at a constant torque region and a constant power region with field weakening, thus both high starting torque and high cruising speed can be achieved. Therefore, as the proposed motor drive possesses the distinct advantages of high power density, high efficiency, and superior dynamic performance, it is very suitable for EV applications. A prototype of a five-phase 22-pole 5 kW motor drive has been designed for an experimental EV. >

  • a novel polyphase multipole square wave permanent magnet motor drive for electric vehicles
    Applied Power Electronics Conference, 1993
    Co-Authors: C C Chan, J Z Jiang, Guihai Chen, X Y Wang, K T Chau
    Abstract:

    A novel high power density permanent magnet (PM) motor drive for electric vehicles (EVs) is proposed. The motor is a polyphase multiple square-wave PM motor, which can be classified as a kind of PM brushless DC motor. The features of the proposed motor as compared with those of the conventional PM brushless DC motor. The multipole Magnetic circuit arrangement permits the minimization of Magnetic Yoke, resulting in the reduction of motor volume and weight. The coil span is purposely designed to be equal to one slot pitch, thus saving in copper used. By using a fractional number of slots per pole per phase, the arrangement of numbers of poles and slots is so unique that the Magnetic force between stator and rotor at any rotating position is uniform, hence eliminating the cogging torque which usually occurs in PM motors. The motor can be controlled to operate at constant torque region and constant power region with field weakening. Thus, both high starting torque and high cruising speed can be achieved. >

R Zhang - One of the best experts on this subject based on the ideXlab platform.

  • novel permanent magnet motor drives for electric vehicles
    IEEE Transactions on Industrial Electronics, 1996
    Co-Authors: C C Chan, J Z Jiang, K T Chau, W Xia, Meiling Zhu, R Zhang
    Abstract:

    Novel permanent magnet (PM) motor drives have been successfully developed to fulfil the special requirements for electric vehicles such as high power density, high efficiency, high starting torque, and high cruising speed. These PM motors are all brushless and consist of various types, namely rectangular-fed, sinusoidal-fed, surface-magnet, buried-magnet, and hybrid. The advent of novel motor configurations lies on the unique electroMagnetic topology, including the concept of multipole Magnetic circuit and full slot-pitch coil span arrangements, leading to a reduction in both Magnetic Yoke and copper, decoupling of each phase flux path, and hence an increase in both power density and efficiency. Moreover, with the use of fractional number of slots per pole per phase, the cogging torque can be eliminated. On the other hand, by employing the claw-type rotor structure and fixing an additional field winding as the inner stator, these PM hybrid motors can further provide excellent controllability and improve efficiency map. In the PM motors, by purposely making use of the transformer EMF to prevent the current regulator from saturation, a novel control approach is developed to allow for attaining high-speed constant-power operation which is particularly essential for electric vehicles during cruising. Their design philosophy, control strategy, theoretical analysis, computer simulation, experimental tests and application to electric vehicles are described.

Vaclav Grim - One of the best experts on this subject based on the ideXlab platform.

  • A Novel Eddy Current Speed Sensor with Ferrite E-Core
    IEEE Magnetics Letters, 2020
    Co-Authors: Mehran Mirzaei, Pavel Ripka, Vaclav Grim
    Abstract:

    This letter presents a novel speed sensor based on the motion-induced eddy currents in conductive moving parts. The Magnetic Yoke is an E-shaped Ferrite core. The excitation coil is on the centre leg of the E-core, and two antiserially connected pick-up coils are on the side legs. Solid iron and aluminum materials are used for the moving part in the simulations and in the measurements. 2D and 3D finite element methods are used for a detailed analysis and for the parametric calculations of the eddy current speed sensor. Despite its simple structure, the proposed eddy current speed sensor shows high linearity. The analysis and the measurements are performed at various speeds and excitation frequencies for an evaluation of the performance of the eddy current speed sensor. The minimum linearity error is less than 0.5%.

  • Design and Optimization of an Eddy Current Speed Sensor for Rotating Rods
    IEEE Sensors Journal, 2020
    Co-Authors: Mehran Mirzaei, Vaclav Grim, Pavel Ripka, Andrey Chirtsov
    Abstract:

    This paper presents the design and optimization of a novel eddy current speed sensor for rotating rods and cylindrical shafts. The sensor consists of one excitation coil and two pick-up coils. All coils are stationary; we consider air coils, and we also use a Magnetic Yoke. We utilize a copper coating on an iron rod to increase the sensitivity, and we compare the performance with the performance achieved for an uncoated iron rod. 3D FEM is utilized for analyzing and for optimizing the design of the proposed sensor. The main advantages of the novel sensors are their simplicity, their low cost and their robust configuration. A linearity error of 0.5% has been achieved. The level of accuracy is limited by mechanical factors. A 1D analytical model has also been developed for rapid analysis and optimization of the sensor. An aluminum rod was also used in the measurements for a comparison with the results achieved with the iron rod.

  • Rotational Eddy Current Speed Sensor
    IEEE Transactions on Magnetics, 2019
    Co-Authors: Jan Vyhnanek, Mehran Mirzaei, Andrey Chirtsov, Pavel Ripka, Vaclav Grim
    Abstract:

    A novel eddy current speed sensor is developed to measure the rotational speed of conductive objects. The sensor consists of one excitation coil and two pick-up coils around a rotating cylinder or rod. The sensor does not use Magnetic Yoke. For the analysis and experimental verification, we used 30 mm diameter non-Magnetic aluminum and also Magnetic solid iron cylinders. The calculated and measured speed ranges are up to 1200 r/min. A 2-D analytical method is developed to calculate sensor performance. A 2-D finite element is also used for simulations to compare results with the 2-D analytical method. A 3-D finite-element analysis is required to take into account significant 3-D effects due to the air coil configuration. The experimental results are presented at different steady-state speeds. The calculation results are compared with measurements to validate theoretical models and sensor performance. The eddy current speed sensor shows high linearity even at low speeds. For ferroMagnetic rods, we suggest a novel double-layer configuration: non-Magnetic conductive ring or shell on top of the iron rod minimizes the influence of the permeability changes. The main advantage of the novel sensor is that it has neither mechanical nor electrical contact to the rotating rod.

  • a fluxgate current sensor with an amphitheater busbar
    IEEE Transactions on Magnetics, 2016
    Co-Authors: Pavel Ripka, Vojtech Petrucha, Michal Pribil, Vaclav Grim, Karel Draxler
    Abstract:

    Large dc and ac electric currents are often measured by open-loop sensors without a Magnetic Yoke. A widely used configuration uses a differential Magnetic sensor inserted into a hole in a flat busbar. The use of a differential sensor offers the advantage of partial suppression of fields coming from external currents. Hall sensors and AMR sensors are currently used in this application. In this paper, we present a current sensor of this type that uses novel integrated fluxgate sensors, which offer a greater range than magnetoresistors and better stability than Hall sensors. The frequency response of this type of current sensor is limited due to the eddy currents in the solid busbar. We present a novel amphitheater geometry of the hole in the busbar of the sensor, which reduces the frequency dependence from 15% error at 1 kHz to 9%.