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How to use the Parameters

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How to use the Parameters

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When you enter a new motor, not all parameters have to be filled in. In this section the critical and non critical parameters are listed.

Critical

Only a few parameters are critical. I.e. they are necessary to generate a 20-sim dynamic model.

 

Keyname

A unique name to identify the motor.

 

Type

The motor type.

 

Maximum Torque or Force

The maximum short-time or torque or force.

 

Maximum Current

The maximum short-time current.

 

R

The resistance at 25° C.

 

L

The terminal inductance.

 

J_rotor or m_motor

The rotor inertia or the the moving mass of the motor.

Desired

Some parameters are desired. I.e. they add more detail to the model:

 

Nominal Torque or Force

Torque or force at nominal operation.

 

Nominal Current

Current at nominal operation.

 

Nominal Speed

Speed at nominal operation.

 

alpha_c

The temperature dependency of the coil resistance.

 

ktc

The temperature dependency of the magnets.

 

poles or pitch

The number of poles (always an even number) or pole pitch (distance N-N poles).

 

d

Mechanical damping and eddy current losses.

 

T_fric

Mechanical friction and hysteresis losses.

 

T_cog

The amplitude of the cogging torque.

 

Temp_amb

The ambient temperature.

 

Temp_initial

The initial temperature of the coils and housing.

 

Temp_max

The maximum coil temperature.

 

RT1

The thermal resistance between rotor and stator.

 

RT2

The thermal resistance between stator and environment.

 

CT1

Thermal capacity of the rotor.

 

CT2

Thermal capacity of the stator.

 

If you do not know the values of these parameters, fill in zero. 20-sim will automatically change some into small numbers to prevent division by zero. Because the nominal torque and current are used to derive the torque constant at nominal operation, they will be replaced by the maximum current and torque if you fill in a zero value.

Torque Speed Plot

Some parameters will add more detail to the torque speed plot:

 

Speed

The maximum speed.

 

Voltage

Maximum short-time voltage.

 

Power

The maximum short time power.

Additional

The remaining parameters are not used in the torque speed plot or the 20-sim model. They are useful for selection criteria when searching motors. If you do not know the values of these parameters, fill in zero.