Application of Synchronous Brushless Motors in Electric Hand Tools

Application of Synchronous Brushless Motors in Electric Hand Tools In the paper, the possibilities to apply synchronous brushless motors in the electric hand tools are considered. The potential of such motors is estimated in a wide range of characteristics. In particular, estimation is made for the electric hand plane with a synchronous motor having outer rotor and excitation from permanent magnets.

Download Full-text

A Study on The Fully Enclosed Housing Of Interior Permanent Magnet Synchronous Motor

Turkish Journal of Computer and Mathematics Education (TURCOMAT) ◽

10.17762/turcomat.v12i6.2071 ◽

2021 ◽

Vol 12 (6) ◽

pp. 687-691

Author(s):

Ho-Joon Lee Et.al

Keyword(s):

Permanent Magnet ◽

Permanent Magnets ◽

Permanent Magnet Synchronous Motor ◽

Synchronous Motor ◽

Operating Conditions ◽

Permanent Magnet Motors ◽

Housing Design ◽

Railway Vehicles ◽

Wide Range ◽

Interior Permanent Magnet

Approximately 2.5 billion won can be saved every year by replacing existing induction motors, which are traction motors for urban railway vehicles, with permanent magnet motors. This paper presents a study on the structural design of a completely enclosed motor to commercialize an interior permanent-magnet synchronous motor (IPMSM) for the traction of urban railway vehicles. The proposed solution provides protection from an inflow of dust and magnetic powder into the rotor that can deteriorate the motor performance and cause burnout. In addition, unless it is a water-cooled or oil-cooled structure, cooling of an electric motor used in medium and large-sized equipment is not easily accomplished. However, completely enclosed motors are vulnerable to overheating; therefore, research into housing design is required to provide cooling. Additionally, the permissible current density through the stator winding must be considered in the design to prevent the occurrence of thermal demagnetization of permanent magnets. Furthermore, IPMSMs require a separate driver for operation and speed controls for a wide range of operating conditions such as rail traction. Thus, a study has been conducted on IPMSMs and other related driver and control technologies, and their suitability has been validated through performance tests.

Download Full-text

AISI 1566

Alloy Digest ◽

10.31399/asm.ad.cs0100 ◽

1984 ◽

Vol 33 (2) ◽

Keyword(s):

Carbon Steel ◽

Heat Treating ◽

Agricultural Machinery ◽

High Carbon ◽

Hand Tools ◽

Steel Mills ◽

Wide Range ◽

Cold Worked ◽

Hot Rolled ◽

Good Workability

Abstract AISI 1566 is a high-carbon (nominally 0.66% carbon) steel containing 0.85-0.15% manganese. Its hardenability is low and on austenitizing and liquid quenching it develops a hard (martensitic) surface with a soft, ductile core. It can be used in the hot-rolled, annealed, normalized, cold-worked or liquid-quenched-and-tempered condition for a wide range of applications. It has good machinability and good workability. Its many uses include springs, shafts, hand tools, railway parts and agricultural machinery. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: CS-100. Producer or source: Carbon steel mills.

Download Full-text

SAE 1345

Alloy Digest ◽

10.31399/asm.ad.sa0425 ◽

1987 ◽

Vol 36 (5) ◽

Keyword(s):

Corrosion Resistance ◽

Physical Properties ◽

Surface Treatment ◽

Tensile Properties ◽

Alloy Steel ◽

Heat Treating ◽

Hand Tools ◽

Manganese Alloy ◽

Steel Mills ◽

Wide Range

Abstract SAE 1345 is a through-hardening, manganese alloy steel with intermediate hardenability. It is most commonly used where good strength is needed but low-to-medium toughness is sufficient. Its wide range of uses in tools and machinery includes hand tools, gears, shafts, bolts and housings. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SA-425. Producer or source: Alloy steel mills and foundries.

Download Full-text

Research on the Non-Magnetic Conductor of a PMSM Based on the Principle of Variable Exciting Magnetic Reluctance

Energies ◽

10.3390/en14020318 ◽

2021 ◽

Vol 14 (2) ◽

pp. 318

Author(s):

Chunyan Li ◽

Fei Guo ◽

Baoquan Kou ◽

Tao Meng

Keyword(s):

Permanent Magnet ◽

Electromagnetic Force ◽

Electromotive Force ◽

Permanent Magnets ◽

Permanent Magnet Synchronous Motor ◽

Synchronous Motor ◽

Magnetic Conductor ◽

Critical Speeds ◽

Motor Structure ◽

Test Result

A permanent magnet synchronous motor (PMSM) based on the principle of variable exciting magnetic reluctance (VMRPMSM) is presented. The motor is equipped with symmetrical non-magnetic conductors on both sides of the tangential magnetized permanent magnets (PMs). By placing the non-magnetic conductor (NMC), the magnetic reluctance in the exciting circuit is adjusted, and the flux weakening (FW) of the motor is realized. Hence, the NMC is studied comprehensively. On the basis of introducing the motor structure, the FW principle of this PMSM is described. The shape of the NMC is determined by analyzing and calculating the electromagnetic force (EF) acting on the PMs. We calculate the magnetic reluctance of the NMC and research on the effects of the NMC on electromagnetic force, d-axis and q-axis inductance and FW performance. The critical speeds from the test of the no-load back electromotive force (EMF) verify the correctness of the NMC design. The analysis is corresponding to the test result which lays the foundation of design for this kind of new PMSM.

Download Full-text