Design & comparison of a conventional and permanent magnet based claw-pole machine for automotive application

Abstract

-This paper presents the design and performance comparison of a conventional claw-pole machine with a permanent magnet based claw-pole machine for automotive application. The magnets are placed in the inter-claw region to decrease the leakage flux and to supply increased magnetic flux in the machine. It has been observed that with the addition of permanent magnets weighing only a few grams, there is a significant increment of more than 22% in output power of the machine. The geometric dimensions of magnets were also varied to verify their effects on performance and it has been observed that with the increase in magnet weight there is a non-linear increment in torque of the machine.

Impact of claw-pole geometry variations on the performance of machine used in automotive application

“…claw core outer radius, claw inside radius, claw side plate thickness and claw undercut angle. The analysis methodology utilized for the machine has been carried out using classical electrical machine analysis theory using Park's transformation and later FE analysis has been investigated to evaluate the machine performance at various speeds [9]- [12]. The dq transformation equations utilized are as follows [9]:…”

Phase-Variable Modeling and Comparative Study between a PMa-CPA and a CPA Alternator by Simulation Analysis

“…As can be seen from Figure 6, the model block consists of four main parts based on the equations previously stated. These are an electrical part for the stator output currents based on ( 8) and rotor field input current based on (9), respectively, an electro-mechanical part for the alternator electrical load torque based on (17), a mechanic-to-electrical part, which produces the three-phase stator dependent voltage sources based on ( 10) and ( 11), the rotor field dependent voltage source based on (13) and back emf on the basis of ( 14), and a mechanical part according to Figure 3 for the alternator speed. The proposed model contains two features, one of which is that the stator and rotor field windings are circuitbased.…”

“…Despite their advantages, traditional CPAs suffer from some limitations such as the reliability, low power density, and low efficiency. In order to meet the increasing power requirements, permanent magnet-assisted or hybrid-excited CPAs were proposed in the past [5][6][7][8][9][10][11][12][13][14][15]. Except the DC excited wound field, the permanent magnet-assisted CPA (PMa-CPA) has permanent magnet placing into the rotor, so that the torque density and power efficiency can be improved.…”

Modern Hybrid Excited Electric Machines

“…The article [49] proposes a new design of a machine with a claw pole and compares its performance with a conventional machine. The new design features permanent magnets in the inter-claw region to reduce leakage flux and provide increased magnetic flux in the machine.…”