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Product Information

SmCo magnets (TOSREX®)
Most suitable magnets for high-temperature use

Rare-earth cobalt magnets (TOSREX®)

Outline

Rare-earth cobalt magnets (TOSREX®) can be used at high temperature because they have a higher Curie point and stable magnetic properties. We offer various types of magnets in a series including those with high magnetic flux density and those with high coercive force. We also offer cost-effective magnets.

Advantages

  • High heat resistance
  • Curie point 780 – 860°C
  • Temperature coefficient of residual magnetic flux density -0.036% /°C

Applications

  • Magnet couplings
  • Electric motors
  • Magnets for sputtering equipment
  • Actuators
  • Automobile magnets (Antilock brake system (ABS), ignition magnets, etc.)
  • Assembly parts, magnetic circuit design
  • Magnetization system (Magnetization power source design, Magnetization yoke design and manufacturing)

Application example Magnet couplings

Magnet couplings

A magnet coupling is a coupling that employs magnetic attractive and objective forces to transmit rotating or thrusting forces from the driving side to the driven side without making contact. When a bulkhead is installed between the driving side and the driven side, both sides will be completely isolated.

Advantages

  • High heat resistance
  • High reliability
  • Downsizing and light weight
  • Four types are lined up
Type Features Applications
Radial type Transmits rotating force Chemical pumps,
vacuum devices,
crutches, etc.
Linear type Transmits thrusting force Rodless cylinders,
Physical and chemical devices,
etc.
Linear rotor type Transmits rotating and
thrusting forces		 Vacuum devices,
Physical and chemical devices, etc.
Axial type Transmits rotating force
with a simple-shaped bulkhead		 Chemical pumps,
submersible pumps,
vacuum pumps, etc.

List of properties

  Material
by Toshiba code		 Residual
magnetic
flux density 		Coercive force Maximum
energy product
(BH)max kJ/m3
bHc kA/m iHc*kA/m
1. TS-28HS 1.04–1.10 755–830 1190–1750 205–225
TS-26HS 1.04–1.10 715–800 1190–1750 190–210
TS-28H 1.06–1.12 715–835 795–1270 205–225
TS-26H 1.01–1.07 675–795 795–1270 190–210
2. TS-28HE 1.05–1.11 595–795 635–955 200–220
TS-26HE 1.00–1.06 555–755 635–955 185–205
3. TS-25H 1.00–1.06 675–795 715–1120 165–200
TS-24H 0.95–1.03 635–755 715–1120 150–195
4. TS-25HE 1.03–1.10 595–795 635–955 185–220
TS-24HE 0.98–1.05 555–755 635–955 170–205
5. TS-28 1.00–1.06 475–715 520–795 175–210
TS-24 0.95–1.03 440–680 520–795 160–195

1.High magnetic flux density & high coercive force
2.High magnetic flux density & high cost performance
3.High coercive force & high cost performance
4.Medium coercive force & high cost performance
5.High cost performance

Classification by shaping method
Right-angle pressing Traverse field
Parallel pressing Transverse field

*iHc can be adjusted within ±160 kA/m as per your request.
Special specifications of ±100 kA/m can be requested.

Magnetization properties

The magnetization property of TOSREX® will vary greatly depending on the level of coercive force (iHc).
The relationships between the magnetization ratio and the magnetization field are shown in the figure below according to the level of coercive force.

(Note) In the case of magnetization by air-core coils, degradation of the magnetizing field by the demagnetizing field shall be taken into consideration.

Magnetization properties

Heat resistance

The upper limit of stably serviceable temperature for permanent magnets varies greatly depending on the level of coercive force (iHc) and the working point (permeance coefficient) of the magnetic circuit.
Relations between the upper limit of stably serviceable temperature (Note), coercive force and permeance coefficient are shown in the figure below.

(Note) The upper limit of stably serviceable temperature shall be taken at the temperature where the irreversible demagnetizing ratio by thermal demagnetizing comes to 10%.

Heat resistance

FAQ

FAQ on rare-earth cobalt magnets

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