 Linear motor
| 134 - Speed Control Analysis of a Permanent Magnet Linear Motor Using the
Control Simulator and the JMAG-RT System |
Module:DP,RT |
2011-02-28 |
| Linear motors are widely used for carrier devices and machine tools because
of their high-speed performance, high acceleration and deceleration, and
accurate positioning.An analysis that accounts for the characteristics
of both the control circuit and linear motor are necessary to measure the
response time of the linear motor during operation.This example presents
the use of the JMAG-RT system to obtain the inductance and electromagnetic
force versus the current and position, and then a speed control analysis
of the permanent magnet linear motor is performed using an RT motor model
and circuit/control analysis.The RT motor model is a mathematical model
output by the JMAG-RT system. |
| 112 - Starting Thrust Force Analysis of a Linear Induction Motor |
Module:FQ |
2011-01-17 |
| A linear induction motor can be constructed at low cost, because the motor
can use a primary side made of coil, and secondary side made of a conductor
that is not magnetized, such as aluminum or copper. A linear induction
motor has disadvantages such as multiple eddy currents flowing in the secondary
conductor sheet and a vast amount of leakage flux between the mover and
stator. For this reason, designing the linear induction motor by accurately
evaluating the thrust force provides improved efficiency.This example presents
the use of a magnetic field analysis to obtain the starting thrust force
of a linear induction motor. |
| 104 - Thrust Force Analysis of a Linear Induction Motor |
Module:TR |
2011-01-17 |
| A linear induction motor can be constructed at low cost, because the motor
can use a primary side made of coil, and secondary side made of a conductor
that is not magnetized, such as aluminum or copper. It is important to
analyze the thrust force as well as the end effect that causes lower performance
at low slip when evaluating the performance of linear induction motors.This
example analyzes the thrust force of a linear induction motor. |
| 64 - Thrust Force Analysis of a Coreless Linear Motor |
Module:TR |
2011-01-17 |
| Coreless linear motors are used for linear motor stages and electronic
packaging machines. Generally, the thrust force of a coreless linear motor
is smaller than that of an iron core linear motor. Since a coreless linear
motor has no cogging, its thrust force variation is much less than an iron
core linear motor. This note presents the use of magnetic field analysis
to obtain the thrust force of a coreless linear motor. |
| 54 - Cogging Analysis of a Moving Coil Linear Motor |
Module:TR |
2011-02-28 |
| Linear motors are used for machine tools, carrier devices and so forth,
so it is very important for them to move smoothly and response quickly.
To do so, cogging needs to be reduced, since cogging causes the variation
in thrust force and speed. One method to reduce cogging is to skew the
magnet. This note presents the use of magnetic field analysis to obtain
the magnetic flux density distribution and cogging of a moving coil linear
motor with a skewed magnet. |
| 2 - Cogging Torque Analysis of a PM Linear Motor UP! | Module:TR | 2012-04-10 | Linear motors have been widely used in carrier devices and the drive units of machine tools due to their capability for high acceleration and deceleration, as well as their accurate positioning. As an issue for improving performance, people are trying to obtain a large thrust force in order to enhance responsiveness, but on the other hand it is also necessary to fulfill the demand for the trade-off of wanting to reduce thrust force variations and the attraction force.
In order to obtain a large thrust force, the material's nonlinear magnetic properties and the magnet's demagnetization characteristics need to be accounted for, and in order to evaluate thrust force variations, they need to be analyzed after modeling a detailed geometry. This is why they need to be studied with a magnetic field analysis simulation based on the finite element method (FEM).
This note presents how to obtain cogging torque, a cause of thrust variation, and evaluate the thrust force and attraction force during drive.
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