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Warning

This version of the Resolver and its associated associated Hardware Configurations have been archived.  If  If starting a new project, consider using a different Hardware Configuration.

Resolver Configuration Page

In the the System Explorer window  window configuration tree, expand the the Power Electronics Add-On custom  custom device and select select Circuit Model >> ACIM >> Resolver Resolver to display this page.  Use  Use this page to configure the Resolver sensor model.

Excerpt

This page includes the following components:

Resolver

Name

Specifies the name of the resolver.

Description

Specifies a description for the resolver.

Angle Conditioning

Symbol

Units

Default

Description

Number of Pole Pairs

pp


1

A gain applied to the mechanical angle of the machine, θm, before it is

translated to

translated to an electrical resolver signal.

 

 Modify this parameter if the resolver is attached to a gear box rather than connected directly to the rotor. To generate resolver signals whose speed corresponds to the mechanical speed of the machine, set this value to 1.

See

the 

the Resolver Model Equations

 for

 for more information.

Angle Offset

θOffset

Degrees

0°

Offset from the mechanical angle of the machine θm.

Reverse Speed



Disabled

Reverses the direction of the resolver when enabled.

Gain Configuration

Symbol

Units

Default

Description

Sine.Sine Gain

Sin.Sin


0.999985

Sine gain applied to the Sine output signal. See the Resolver Model Equations for more information.

Sine.Cos Gain

Sin.Cos


0

Cosine gain applied to the Sine output signal. See the Resolver Model Equations for more information.

Cos.Sin Gain

Cos.Sin


0

Sine gain applied to the Cosine output signal. See the Resolver Model Equations for more information.

Cos.Cos Gain

Cos.Cos


0.999985

Cosine gain applied to the Cosine Output signals. See the Resolver Model Equations for more information.

Excitation Conditioning

Symbol

Units

Default

Description

Sampling Frequency

Ts

MHz

1MHz

The frequency at which the Excitation Carrier signal is sampled to determine the Sine and Cosine outputs. See Resolver Excitation Signal for more information.

Phase Delay

Tpd

microseconds

0us

Creates a phase delay in the output Sine and Cosine signals.

  This

 This is used to simulate a physical delay in non-ideal resolvers.

Resolver Model Description

A resolver is a sensor that provides feedback about the angular position and velocity of a rotating component, such as the rotor of an electrical motor. Image Removed

Image Added

Figure 1.  An example of a operating resolver where a sinusoidal excitation signal is input into the resolver and the result is two output signals, Sine Output and Cosine Output

During operation, a sinusoidal excitation signal is provided to the resolver.   The resolver modulates the input excitation signal to produce two outputs representing sin(x) and cos(x), where x is the angle of the rotor.  From  From the sin(x) and cos(x) signals controllers are reconstituted to calculate angular position of the machine.

Image ModifiedFigure 2.  Sine and Cosine signals generated by a resolver with an input Excitation sinusoidal signal.

Anchor
Equations
Equations
Resolver Model Equations

The resolver model outputs are calculated using the following sets of equations:

Mathblock
anchorSineOutput
alignmentcenter
Sine \; Output = [Sin.Sin*sin(pp(\theta_m - \theta_{Offset})) + Sin.Cos * cos(pp * \theta_m - \theta_{Offset}))] * Excitation
Mathblock
anchorCosineOutput
alignmentcenter
Cosine \; Output = [Cos.Sin*sin(pp(\theta_m - \theta_{Offset})) + Cos.Cos * cos(pp * \theta_m - \theta_{Offset}))] * Excitation

Where Sin.Sin, Sin.Cos, Cos.Sin, and Cos.Cos represent gains that are applied to simulate a non-ideal resolver.   To simulate an ideal resolver, set the Sin.Sin and Cos.Cos gains to 1, set the Sin.Cos and Cos.Sin gains to 0, set the pp to 1, and set the θOffset to  to 0.  This  This results in the following equations:

Mathblock
anchorsimpleSineOutput
alignmentcenter
Sine \; Output = sin(\theta_m) * Excitation
Mathblock
anchorsimpleCosineOutput
alignmentcenter
Cosine \; Output = cos(\theta_m) * Excitation

Anchor
Excitation
Excitation
Resolver Excitation Signal

For this resolver model, the excitation signal must be provided through an Analog Input channel.  To  To confirm the index of the channel to use, refer to the pinout information for your hardware configuration in the the Archived Hardware Configurations section.  In  In most cases, the following channels are used:

Motor 1

Analog Input 00

Motor 2 (if available)

Analog Input 01

The amplitude of the excitation signal must be within

a 

a -1V to 1V

 range

 range.

 

If inputting a signal outside this range, use the Gain parameter for the Analog Input channel to manipulate the amplitude. Also note that the input signal must not exceed the specified voltage limitations of the hardware in any case.

  Typically

 Typically, this hardware range is -10V to 10V, although the exact value can be confirmed on the description page of the Hardware Configuration.