WO2008077363A2 - Electric motor having reduced detent torque - Google Patents
Electric motor having reduced detent torque Download PDFInfo
- Publication number
- WO2008077363A2 WO2008077363A2 PCT/DE2007/001826 DE2007001826W WO2008077363A2 WO 2008077363 A2 WO2008077363 A2 WO 2008077363A2 DE 2007001826 W DE2007001826 W DE 2007001826W WO 2008077363 A2 WO2008077363 A2 WO 2008077363A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sub
- electric motor
- armature
- slot
- tooth
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/26—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating armatures and stationary magnets
- H02K21/28—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating armatures and stationary magnets with armatures rotating within the magnets
- H02K21/30—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating armatures and stationary magnets with armatures rotating within the magnets having annular armature cores with salient poles
Definitions
- the invention relates to an electric motor, in particular a DC motor, with an armature having a number of slot slots for receiving conductors of an armature winding.
- An electric motor usually converts electrical energy into mechanical work by means of magnetic fields.
- the force exerted by a magnetic field on a number of conductors of a coil is translated into motion.
- Electric motors usually generate rotating movements, but they can also perform translational.
- An electric motor typically includes a movable and a fixed main element. In special embodiments, these two main elements can move relative to each other about a fixed reference point. One of the two main elements then takes over as the carrier of a number of permanent magnets or a winding the structure of an exciter field, while in the other main element, also referred to as an anchor, the energy conversion takes place.
- the anchor usually consists of a laminated core, which is formed from individual sheets and in which the armature winding is on or applied.
- the stator consists of main poles with Polkernen and Polschu- hen, the exciter winding, which sits on the pole cores, and the yoke ring, the housing.
- the exciter winding is often replaced by permanent magnets.
- compensation windings may be mounted in the pole pieces of the main poles.
- the stator consists of a component with uniformly distributed mutes.
- the Excitation windings and reversing windings are then in the grooves.
- the rotor consists of rotor laminations, which are pressed on a steel shaft.
- DC motors are in certain positions "of the armature to the magnet particularly strong attractive forces. As the armature poles advertising more strongly attracted by the magnets, the closer 'they are them, the rotor remains only in certain positions are provided and results in particular at low operating voltages , ie low speeds, a jerky run.
- cogging torque occurs in all direct current motors. It has a negative effect on the noise behavior and vibration excitation and, in touch-sensitive applications, leads to noticeable pole sensitivity, which is often perceived as disturbing.
- the invention is based on the consideration that the slot slots produce a cogging torque and that a cogging torque is also generated by the attachment of further grooves. If these additional grooves are properly positioned, for example shifted by 180 ° with respect to the cogging torque of the slot slots, the existing cogging torque could be almost extinguished.
- the advantages achieved by the invention are in particular that the noise and the vibration excitations, which arise during operation of a DC motor by the cogging torque of the slot slots of the armature strongly be reduced or extinguished and thus a trouble-free operation is possible.
- PIG. 1 and 2 an electric motor in a schematic representation
- FIG. 3 a stator in cross section.
- FIG. 1 shows one half of an electric motor 1, which is referred to as
- the stator teeth 8 of the stator 4 are mounted on the yoke 10.
- the space between the stator teeth 8, which is necessary for the introduction of the winding, not shown here in the groove 12, is referred to as groove slot 14, said groove slots 14 are responsible for the generation of the cogging torque.
- stator teeth 8 are each enclosed by the winding 16, as shown in FIG. 2 shows.
- the magnetic flux between the wick ment 16 and the permanent magnet 6 provides with appropriate energization for the movement of the electric motor. 1
- FIG. 3 shows the section of a laminated core 18 with grooves 12 for accommodating the winding 16 and with a tooth tip 20 of the stator tooth 8, on the circumference of which auxiliary grooves 22 are positioned at the air gap. Their positioning is calculated according to the formula from claim 1.
- the exciting current In order for the exciting current to also pass through the winding 16 and to introduce the conductors of the winding 16 into the groove 12 in the course of production of the electric motor 1 and the stator 4, the voltage narrows Groove 12 to narrow groove slots 14 between the stator teeth 8 of the stator. 4
- auxiliary grooves 22 By introducing a number of auxiliary grooves 22 into the tooth head 20 of the stator 4 with an opening angle 24 of the auxiliary groove 22, these generate a further cogging torque which is phase-shifted by 180 ° relative to the original cogging torque generated by the stator 4 and its slot slots 14 is.
- the positioning 26 of the auxiliary groove 22 on the tooth head 20 according to the formula
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Brushless Motors (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Windings For Motors And Generators (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112007003358T DE112007003358A5 (en) | 2006-12-22 | 2007-10-13 | electric motor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006060891.7 | 2006-12-22 | ||
DE200610060891 DE102006060891A1 (en) | 2006-12-22 | 2006-12-22 | electric motor |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008077363A2 true WO2008077363A2 (en) | 2008-07-03 |
WO2008077363A3 WO2008077363A3 (en) | 2008-09-18 |
Family
ID=39031054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2007/001826 WO2008077363A2 (en) | 2006-12-22 | 2007-10-13 | Electric motor having reduced detent torque |
Country Status (2)
Country | Link |
---|---|
DE (2) | DE102006060891A1 (en) |
WO (1) | WO2008077363A2 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5801463A (en) * | 1996-06-26 | 1998-09-01 | Minebea Co., Ltd. | Dynamoelectric machine |
DE19857180A1 (en) * | 1998-12-11 | 2000-06-15 | Bosch Gmbh Robert | Motor with an electrically commutated stator and a rotor with permanent magnets |
US6104117A (en) * | 1996-05-24 | 2000-08-15 | Matsushita Electric Industrial Co., Ltd. | Motor with reduced clogging torque incorporating stator salient poles and rotor magnetic poles |
EP1246349A2 (en) * | 2001-03-30 | 2002-10-02 | Japan Servo Co. Ltd. | Permanent magnet motor |
DE10247187A1 (en) * | 2001-10-09 | 2003-06-18 | Valeo Electrical Sys Inc | Stator tooth for stator core e.g. of brushless permanent magnet motor, has tooth surface with one or more flat segments extending from one end of first edge formed by slot opening to end of second edge |
US20050023919A1 (en) * | 2000-05-25 | 2005-02-03 | Mitsubishi Denki Kabushiki Kaisha | Permanent magnet motor |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4933584A (en) * | 1988-12-22 | 1990-06-12 | General Electric Company | Electronically commutated motor having skewed magnetics |
IT1320322B1 (en) * | 2000-04-28 | 2003-11-26 | Filippis Pietro De | PERMANENT MAGNET BRUSHLESS MOTOR. |
JP4250878B2 (en) * | 2001-08-08 | 2009-04-08 | パナソニック株式会社 | Vernier type brushless motor |
-
2006
- 2006-12-22 DE DE200610060891 patent/DE102006060891A1/en not_active Withdrawn
-
2007
- 2007-10-13 WO PCT/DE2007/001826 patent/WO2008077363A2/en active Application Filing
- 2007-10-13 DE DE112007003358T patent/DE112007003358A5/en not_active Ceased
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6104117A (en) * | 1996-05-24 | 2000-08-15 | Matsushita Electric Industrial Co., Ltd. | Motor with reduced clogging torque incorporating stator salient poles and rotor magnetic poles |
US5801463A (en) * | 1996-06-26 | 1998-09-01 | Minebea Co., Ltd. | Dynamoelectric machine |
DE19857180A1 (en) * | 1998-12-11 | 2000-06-15 | Bosch Gmbh Robert | Motor with an electrically commutated stator and a rotor with permanent magnets |
US20050023919A1 (en) * | 2000-05-25 | 2005-02-03 | Mitsubishi Denki Kabushiki Kaisha | Permanent magnet motor |
EP1246349A2 (en) * | 2001-03-30 | 2002-10-02 | Japan Servo Co. Ltd. | Permanent magnet motor |
DE10247187A1 (en) * | 2001-10-09 | 2003-06-18 | Valeo Electrical Sys Inc | Stator tooth for stator core e.g. of brushless permanent magnet motor, has tooth surface with one or more flat segments extending from one end of first edge formed by slot opening to end of second edge |
Also Published As
Publication number | Publication date |
---|---|
DE112007003358A5 (en) | 2009-12-03 |
WO2008077363A3 (en) | 2008-09-18 |
DE102006060891A1 (en) | 2008-06-26 |
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