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Linear motors

Linear motors

     A linear motor is a transmission that converts electrical energy directly into linear motion mechanical energy without the need for any intermediate conversion mechanism. It can be seen as a rotating motor that is cut radially and flattened. Linear motors are also called linear motors, linear motors, linear motors, and push rod motors. The most common types of linear motors are flat and U-groove, and tubular. The typical composition of the coil is three-phase, and the Hall element realizes brushless commutation.
   Linear motors are often simply described as rotating motors that are flattened and work the same way. The mover is made by compressing the coils together with an epoxy material; the track is to fix the magnet to the steel. The mover of the motor includes a coil winding, a Hall element circuit board, a thermistor and an electronic interface. In a rotating electrical machine, the mover and the stator require a rotating bearing to support the mover to ensure an air gap in the relatively moving portion. Similarly, linear motors require linear guides to maintain the position of the mover in the magnetic field generated by the track. The encoder of the rotary servo motor is mounted on the on-axis feedback position. The linear motor needs to feed back the linear position feedback device--linear encoder, which can directly measure the position of the load and improve the position accuracy of the load.

Linear motor picture:

Linear motor picture

Linear motor model and technical parameters:
model JTM135 JTM170 JTM210
Encoder Magnetic scale/grating ruler Magnetic scale/grating ruler Magnetic scale/grating ruler
Resolution 0.5μm / 1μm / 5μm 0.5μm / 1μm / 5μm 0.5μm / 1μm / 5μm
Motor type Iron core linear motor Iron core linear motor Iron core linear motor
Motor specifications T052 T053 T072 T073 T092 T093 T112 T113
Continuous thrust(N) 107 175 177 290 248 408 319 524
Peak thrust(N) 321 525 531 870 744 1224 957 1572
Maximum speed(mm/sec) 4000 4000 4000
Maximum acceleration(G) 10 10 10
Repeatability(mm) ±0.002(Determined by encoder resolution) ±0.001(Determined by encoder resolution) ±0.001(Determined by encoder resolution)
Linear motor application advantages:
Linear motors are mainly used in three aspects: first, they are applied to automatic control systems, and there are many such applications; secondly, they are used as long-term continuous running motor; third, applications require large linear motion in short time and short distance. In the device.
(1) The structure is simple. The tubular linear motor does not need to go through the intermediate conversion mechanism to directly generate linear motion, which greatly simplifies the structure, reduces the motion inertia, greatly improves the dynamic response performance and positioning accuracy, and also improves the reliability, saves the cost, and makes the manufacturing and maintenance more Simple. Its primary and secondary can be directly part of the organization, and this unique combination makes this advantage even more apparent.
(2) Suitable for high speed linear motion. Because there is no constraint on centrifugal force, ordinary materials can achieve higher speeds. Moreover, if the air gap or the magnetic pad is used to store the gap between the primary and secondary, there is no mechanical contact during the movement, and thus the moving part has no friction and noise. In this way, the transmission components are not worn, which can greatly reduce the mechanical loss and avoid the noise caused by the streamers, cables, gears and pulleys, thereby improving the overall efficiency.
(3) The primary winding utilization is high. In tubular linear induction motors, the primary winding is pie-shaped and has no end windings, so the winding utilization is high.

(4) No lateral edge effect. The transverse effect refers to the weakening of the magnetic field at the boundary due to the lateral breaking, and the cylindrical linear motor has no lateral break, so the magnetic field is evenly distributed along the circumference.
(5) It is easy to overcome the problem of single-sided magnetic pull. The radial pulling forces cancel each other out, and there is basically no problem of single-sided magnetic pulling force.


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