FAQ

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What is cogging?

Definitions

Answer: Cogging is an result of the iron core motor design. The iron core has “preferred” positions relative to the magnets, and the motor must vary its thrust force to overcome these positions. This results in a motion that is less smooth than that of an ironless linear motor, and can be compared to moving over an old-fashioned washboard.For more details please see: “What is done to reduce the cogging effect of Iron Core motors?”

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What is Ultimate Force?

Definitions

Answer: The force generated by the motor beyond the saturation point in the non-linear area of the Motor Force Constant. The actual value of the Motor Force Constant at Ultimate Force is 26% less than the linear value. This is only applicable for Iron core motors. Efficiency of transfer of current to force is lower and causes the coils to heat up faster. For ultimate force the temperature increase is 10°C/s.

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What is Peak Force?

Definitions

Answer: For Iron core motors the peak force is the force generated by the motor just beyond the saturation point of the Motor Force Constant. The actual value of the Motor Force Constant is 14% less than the linear value. The coils will heat up with 6°C/s. Iron less motors lack a saturation point in the Motor Force Constant. The peak force is determined by the tolerated material expansion due to an increased temperature of the coil. For Iron core motors this increase is at 20°C/s.

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Continuous Force air cooled?

Definitions

Answer: The continuous force for a non-water cooled coil. At continuous force the heat gain and dissipation in the coil are equal. Dissipation occurs purely via conduction, convection and radiation. Tecnotion' linear motors continuous force is specified for a mounting surface at 20°C. The thermal resistance is 0,05K/W when mounted to an aluminium heat sink.

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Continuous Force water cooled

Definitions

Answer: At continuous force the heat gain and dissipation in the coil is equal. For Tecnotion linear motors the mounting surface needs to be at 20°C. The thermal resistance for water cooling is 0,02K/W when combined with an aluminium heat sink.

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What is motor constant?

Definitions

Answer: Ratio between force in Newton and dissipated heat in Watts [N^2/W]. A higher value of the constant implies that the motor dissipates less heat for the generation of a certain amount of force. The value decreases at higher coil temperatures. This is caused by increased Rph-ph winding resistance. S=(K^2/(3*Rph-ph)

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What is back EMF Phase-Phase_peak?

Definitions

Answer: Back Electro Magnetic force. A linear motor, when operated, also acts as a generator. The Back EMF describes the coefficient between the generated voltage and the speed of the motor [V/m/s]. When the generated Voltage is nearly equal to the bus voltage of the system the motor cannot run any faster.

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Temperature Sensor

Definitions

Answer: A temperature sensor can be used for monitoring the coil temperature. Iron core and Torque motors are fitted with KTY sensors. Ironless sensors are fitted with a NTC sensor.

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NTC temperature sensor

Definitions

Answer: The temperature sensors for the Ironless series. This sensor has no ferromagnetic components to prevent any attraction forces within the magnet yoke. This sensor has a negative coefficient between temperature and resistance.

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Temperature Cut-off sensor

Definitions

Answer: A cut-off sensor is used to protect the motor from damage due to overheating. The PTC-1k-type sensor has a positive coefficient between temperature and resistance. Near 110°C the resistance increases exponentially. The sensor output can be used as input for the controller to shut off the current to prevent damage to the coils.

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Resistance per phase

Definitions

Answer: The resistance value in [Ohm] of one phase of the motor. This value cannot be verified via the motor cables. The double value will be measured because of the star configuration of the motor

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Induction per phase

Definitions

Answer: The induction value in [mili Henry] of one phase of the motor. This value cannot be verified via the motor cables. The double value will be measured because of the star configuration of the motor.

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Powerhouse in flat design

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Direct Drive Motor Selection & Simulation Tool

Tecnotion launched its new online simulation tool. This new online tool replaces our offline tool. With… Read more