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((More citations needed|date=April 2019))
((short description|Type of electric motor))
[[File:Motore a riluttanza magnetica variabile.gif|thumb|Cross-section of switched reluctance machine with 6 stator and 4 rotor poles. Notice the concentrated windings on the stator poles.]]
[[File:Reluktanzmotor.svg |thumb|Cross-section of switched reluctance machine with 6 stator and 4 rotor poles. Notice the concentrated windings on the stator poles.]]
A '''reluctance motor''' is a type of [[electric motor]] that induces non-permanent magnetic poles on the [[ferromagnetic]] rotor. The rotor does not have any windings. It generates torque through [[magnetic reluctance]].

Reluctance motor subtypes include synchronous, variable, [[Switched reluctance motor|switched]] and variable stepping.

Reluctance motors can deliver high [[power density]] at low cost, making them attractive for many applications. Disadvantages include high [[torque ripple]] (the difference between maximum and minimum torque during one revolution) when operated at low speed, and noise due to torque ripple.<ref>((Cite web|url=https://e2e.ti.com/blogs_/b/motordrivecontrol/archive/2016/02/18/acoustic-noise-in-home-appliances-due-to-torque-ripple-in-motor-drives-part-1|title=Acoustic noise in home appliances due to torque ripple in motor drives – part 1 - Motor Drive & Control - Blogs - TI E2E Community|website=e2e.ti.com|access-date=2019-04-09))</ref>

Until the early twenty-first century, their use was limited by the complexity of designing and controlling them.((Disputed inline
|Cheap and simple |date=July 2020)) Advances in theory, computer design tools, and low-cost [[embedded system]]s for control overcame these obstacles. [[Microcontroller]]s use [[real-time computing]] control algorithms to tailor drive waveforms according to rotor position and current/voltage feedback. Before the development of [[Large-scale integration|large-scale integrated circuits]], the control electronics were prohibitively costly.

((TOC limit|3))

==Design and operating fundamentals==
The [[stator]] consists of multiple projecting (salient) [[electromagnet]] poles, similar to a wound field [[Brushed DC electric motor|brushed DC motor]]. The rotor consists of soft magnetic material, such as laminated [[silicon steel]], which has multiple projections acting as salient magnetic poles through [[magnetic reluctance]]. For switched reluctance motors, the number of rotor poles is typically less than the number of stator poles, which minimizes torque ripple and prevents the poles from all aligning simultaneously—a position that cannot generate torque.

When a stator pole is equidistant from two adjacent rotor poles, the stator pole is said to be in the "fully unaligned position". This is the position of maximum [[magnetic reluctance]] for the rotor pole. In the "aligned position", two (or more) rotor poles are fully aligned with two (or more) stator poles, (which means the rotor poles completely face the stator poles) and is a position of minimum reluctance.

When a stator pole is energized, the rotor torque is in the direction that reduces reluctance. Thus, the nearest rotor pole is pulled from the unaligned position into alignment with the stator field (a position of less reluctance). (This is the same effect used by a [[solenoid (engineering)|solenoid]], or when picking up [[ferromagnetic]] [[metal]] with a [[magnet]].) To sustain rotation, the stator field must rotate in advance of the rotor poles, thus constantly "pulling" the rotor along. Some motor variants run on [[3-phase AC]] [[electric power|power]] (see the synchronous reluctance variant below). Most modern designs are of the switched reluctance type, because electronic [[Commutator (electric)|commutation]] gives significant control advantages for motor starting, speed control and smooth operation (low torque ripple).

The [[inductance]] of each phase winding in the motor varies with position, because the reluctance also varies with position. This presents a [[control system]]s challenge.

==Types==
===Synchronous reluctance===
Synchronous reluctance motors (SynRM) have an equal number of stator and rotor poles. The projections on the rotor are arranged to introduce internal flux “barriers“, holes that direct the magnetic flux along the so-called direct axis. The number of poles must be even, typically 4 or 6.

The rotor operates at synchronous speeds without current-conducting parts. Rotor losses are minimal compared to those of an [[induction motor]], however it doesn't normally have a lot of [[torque]].<ref>((Cite web |last=Magazine |first=Smithsonian |last2=Osborne |first2=Margaret |title=This 17-Year-Old Designed a Motor That Could Potentially Transform the Electric Car Industry |url=https://www.smithsonianmag.com/innovation/this-17-year-old-designed-a-motor-that-could-potentially-transform-the-electric-car-industry-180980550/ |access-date=2022-08-19 |website=Smithsonian Magazine |language=en))</ref><ref>((Cite web |title=ETSD014 - Investigating a Novel Electric Motor Design |url=https://projectboard.world/isef/project/etsd014---investigating-a-novel-electric-motor-design |access-date=2022-08-19 |website=Society for Science))</ref>

Once started at synchronous speed, the motor can operate with sinusoidal voltage. Speed control requires a [[variable-frequency drive]].

===Switched reluctance or variable reluctance===
((Main|Switched reluctance motor))
The switched reluctance motor (SRM) is a form of [[stepper motor]] that uses fewer poles. The most rudimentary form of a SRM has the lowest construction cost of any electric motor because of its simple structure, and even industrial motors may have some cost reduction due to the lack of rotor windings or permanent magnets. Common uses include applications where the rotor must be held stationary for long periods, and in potentially [[Electrical equipment in hazardous areas|explosive environments]] such as mining because it operates without a mechanical commutator.

The phase windings in an SRM are electrically isolated from each other, resulting in higher [[fault tolerance]] than inverter-driven AC induction motors. The optimal drive waveform is not a pure [[Sine wave|sinusoid]], due to the non-linear torque relative to rotor displacement, and the highly position-dependent inductance of the stator phase windings.

==Applications==

*Analog electric meters
*Analog electric clocks
*Some [[washing machine]] designs
*Control rod drive mechanisms of nuclear reactors
*[[Hard disk drive]] motor
*[[Electric vehicle]]s<ref>[17-Year-Old Boy’s Electric Motor Design Could Revolutionize EVs
Story by Dustin Wheelen • Aug 16, 2022, CNN.com https://www.msn.com/en-ca/autos/news/17-year-old-boy-s-electric-motor-design-could-revolutionize-evs/ar-AA10Ju0j]</ref>
*Power tools such as drill presses, lathes, and bandsaws

== See also ==
* [[Electric_vehicle#Energy_and_motors | Electric vehicle motor]]
* [[Flux switching alternator]], a similar machine arrangement, used as a generator.
* [[Switched reluctance motor]]
* [[Stepping motor]]

==References==
((Reflist))

== External links ==
((Commons category|Switched reluctance machines))
* Real-Time Simulation of Switched Reluctance Motor Drives [https://web.archive.org/web/20110105191414/http://www.opal-rt.com/sites/default/files/technical_papers/toptec_switched_reluctance.pdf Technical Paper]

((Electric motor))
((Authority control))

((DEFAULTSORT:Reluctance Motor))
[[Category:Electric motors]]

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