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The brushless DC motor with two sets of control channels is presented in this paper; it will be used in an electro-mechanical actuation (EMA) of the next generation more electric-aircraft (MEA). If either of the two channels is failure the motor work under the single channel mode, i.e. fault tolerant operation mode. There exists mutual inductance between the two sets of control channels, so the parameters...
When BLDC drive mode is used to drive PM-AC motors, the influence of the transient current cannot be neglected, especially during high speed operation. In this paper, this influence to the BLDC drive mode is analyzed, and an analytic model for describing the transient current to the commutation angle and copper loss is presented. A method to determine the optimal commutation angle of the BLDC mode...
The paper deals with permanent magnet brushless motors designed for automotive applications. The presented motors are used in automated manual transmission (AMT) and twin-clutch systems. In the paper there are summarized requirements for electric motors in such systems. Next, the different configurations (different number of slots/poles, rotorpsilas types) are compared. The advantages and drawbacks...
This paper presents a comparison of electromechanical system used in a vehicle with three different on-board voltage levels. The electromechanical system is composed of interior permanent brushless synchronous motor - IPM and electronic control unit - ECU. Three voltage levels are analyzed in order to increase systempsilas efficiency and decrease systempsilas weight. Additionally, the important factors...
This paper presents the design and analysis of a new double-stator permanent brushless (DSPMBL) motor for hybrid electric vehicles. The corresponding output power equation is analytically derived. The initial calculation of motor dimensions and parameters, including the core diameter, stack length, permanent magnet size and winding connection modes, are also discussed. A DSPMBL motor is designed....
The doubly-salient permanent magnet (DSPM) motor employing straight rotor and concentrated windings is conventionally operated by means of current chopping control in constant-torque region and angle-position control in constant-power region due to the trapezoidal back-EMF waveform. However, the rotor-skewing method can be used to improve back-EMF and inductances waveforms to be sinusoidal significantly...
In this paper, the static and dynamic electromagnetic performance, including the airgap field distribution, the back-emf waveform, the cogging torque, and the torque-speed characteristic and the efficiency, of three alternative Halbach permanent magnet brushless motors, employing anisotropic bonded NdFeB Halbach cylinder with and without rotor back-iron, as well as segmented Halbach cylinder with...
The stator-doubly-fed doubly salient (SDFDS) motor for electric vehicles rotates with constant torque below basic speed, whereas with constant power by weakening flux over basic speed. The EMF of SDFDS motor can be controlled for the constant power control by the flux-weakening in theory as the controllable of flux. But the nonlinear characteristics of SDFDS motor cause the EMF to be anomalous square-wave...
Integrated electro-hydrostatic actuation system has the advantages of both small size and high power density. Dual-redundancy permanent magnet brushless DC motor (BLDCM) as the actuation component in electro-hydrostatic actuator (EHA) improves system reliability. But unequal electromagnetic torque in different redundant motor is a severe problem. It may impact the performance of the motor, even damage...
Permanent magnet brushless motor (PMBM) is widely used in driving system of electric vehicle because of its high power density, wide speed regulating range and high efficiency. 120deg square current for PMBM is simple in control method, but complex in simulation. A kind of simple and useful simulation module for PMBM is the key point for analyzing the torque ripple and upgrading its performance. This...
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