# Electrical MachinesReluctance Machines

Electrical Machines: Reluctance Machines 7 Reluctance Machines 7.1 Synchronous Reluctance Machines The torque of the salient-pole synchronous machine is composed of two parts; the first one is generated by the excitation current and the second one by the different reluctance in d- and q-axis: §§ · · 3p UU U 1 1 Ts=ϑin()+ − sin()2ϑ (7.1) ¨¨ ¸ ¸ ω X2X X 1d q d ©© ¹ ¹ Omitting the excitation winding, the slip rings, and the brushes the torque be- cause of the different reluctance is remaining: §· 3p U 1 1 Ts =− in()2ϑ (7.2) ¨¸ ω 2X X 1q d ©¹ The advantages of such a machine are: • simple construction (no excitation winding, no slip rings, no brushes); • no (excitation) losses in the rotor. A challenge is the fact that the reachable torque is depending on the reactances in d- and q-axis: E.g. for X2 = X it had been calculated for the salient-pole dq synchronous machine (Sect. 5.5) that the reluctance torque was just half of the torque generated by the nominal excitation current. Another disadvantage is the poor power factor cos() ϕ (see Sect. 5.5), so that an inverter with large power rat- ing has to http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

# Electrical MachinesReluctance Machines

Part of the Mathematical Engineering Book Series (volume 4)
Electrical Machines — Sep 4, 2014
15 pages

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Publisher
Springer Berlin Heidelberg
ISBN
978-3-642-17583-1
Pages
231 –245
DOI
10.1007/978-3-642-17584-8_7
Publisher site
See Chapter on Publisher Site

### Abstract

7 Reluctance Machines 7.1 Synchronous Reluctance Machines The torque of the salient-pole synchronous machine is composed of two parts; the first one is generated by the excitation current and the second one by the different reluctance in d- and q-axis: §§ · · 3p UU U 1 1 Ts=ϑin()+ − sin()2ϑ (7.1) ¨¨ ¸ ¸ ω X2X X 1d q d ©© ¹ ¹ Omitting the excitation winding, the slip rings, and the brushes the torque be- cause of the different reluctance is remaining: §· 3p U 1 1 Ts =− in()2ϑ (7.2) ¨¸ ω 2X X 1q d ©¹ The advantages of such a machine are: • simple construction (no excitation winding, no slip rings, no brushes); • no (excitation) losses in the rotor. A challenge is the fact that the reachable torque is depending on the reactances in d- and q-axis: E.g. for X2 = X it had been calculated for the salient-pole dq synchronous machine (Sect. 5.5) that the reluctance torque was just half of the torque generated by the nominal excitation current. Another disadvantage is the poor power factor cos() ϕ (see Sect. 5.5), so that an inverter with large power rat- ing has to

Published: Sep 4, 2014

Keywords: Phase Current; Rotor Position; Induction Machine; Pulse Operation; Power Transistor