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Łukasz Przeniosło
Łukasz Przeniosło
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I am trying to implement a FOC algorithm in an MCU to use with a BLDC motor.

My problem is that I only have the Hall sensor feedback, no precise encoder can be used. With this 4 pole pairs motor, Hall sensors give 15 degree resolution.

I think this is the reason my algorithm is failing and I cant get a DC constant d and q values.

Is there any better way to drive a BLDC motor than FOC? What I need actually is a way to feed torque/ current to the regulator and be able to precisely read the feedback.

My analog circuitry for measuring \$I_a\$ and \$I_b\$ currents works fine, I just don't know how to calculate the needed feedback value.

In other words, can FOC even work for BLDC without an encoder but just with Hall sensors? If not, what is the better way?

My analog circuit: enter image description here

I am trying to implement a FOC algorithm in an MCU to use with a BLDC motor.

My problem is that I only have the Hall sensor feedback, no precise encoder can be used. With this 4 pole pairs motor, Hall sensors give 15 degree resolution.

I think this is the reason my algorithm is failing and I cant get a DC constant d and q values.

Is there any better way to drive a BLDC motor than FOC? What I need actually is a way to feed torque/ current to the regulator and be able to precisely read the feedback.

My analog circuitry for measuring \$I_a\$ and \$I_b\$ currents works fine, I just don't know how to calculate the needed feedback value.

In other words, can FOC even work for BLDC without an encoder but just with Hall sensors? If not, what is the better way?

I am trying to implement a FOC algorithm in an MCU to use with a BLDC motor.

My problem is that I only have the Hall sensor feedback, no precise encoder can be used. With this 4 pole pairs motor, Hall sensors give 15 degree resolution.

I think this is the reason my algorithm is failing and I cant get a DC constant d and q values.

Is there any better way to drive a BLDC motor than FOC? What I need actually is a way to feed torque/ current to the regulator and be able to precisely read the feedback.

My analog circuitry for measuring \$I_a\$ and \$I_b\$ currents works fine, I just don't know how to calculate the needed feedback value.

In other words, can FOC even work for BLDC without an encoder but just with Hall sensors? If not, what is the better way?

My analog circuit: enter image description here

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Daniel
Daniel
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FOC for a BLDC motor with Hall sensors but no encoder

I am trying to implement a FOC algorithm in an MCU to use with a BLDC motor. 

My problem is that I only have the hallHall sensor feedback, no precise encoder can be used. With this 4 pole pairs motor hall, Hall sensors give 15 degree resolution. 

I think this is the reason my algorithm is failing and I cant get a DC constant d and q values. Is

Is there any better way to drive a BLDC motor than FOC? What I need actually is a way to feed torque/ current to the regulator and be able to precisely read the feedback. 

My analog circuitry for measuring Ia\$I_a\$ and Ib\$I_b\$ currents works fine, I just dontdon't know how to calculate the needed feedback value. In

In other words- Can, can FOC even work for BLDC without an encoder but just with Hall sensors? If not, what is the better way? I would appreciate all help.

FOC for a BLDC motor

I am trying to implement a FOC algorithm in an MCU to use with a BLDC motor. My problem is that I only have the hall sensor feedback, no precise encoder can be used. With this 4 pole pairs motor hall sensors give 15 degree resolution. I think this is the reason my algorithm is failing and I cant get a DC constant d and q values. Is there any better way to drive a BLDC motor than FOC? What I need actually is a way to feed torque/ current to the regulator and be able to precisely read the feedback. My analog circuitry for measuring Ia and Ib currents works fine, I just dont know how to calculate the needed feedback value. In other words- Can FOC even work for BLDC without encoder but just with Hall sensors? If not, what is the better way? I would appreciate all help.

FOC for a BLDC motor with Hall sensors but no encoder

I am trying to implement a FOC algorithm in an MCU to use with a BLDC motor. 

My problem is that I only have the Hall sensor feedback, no precise encoder can be used. With this 4 pole pairs motor, Hall sensors give 15 degree resolution. 

I think this is the reason my algorithm is failing and I cant get a DC constant d and q values.

Is there any better way to drive a BLDC motor than FOC? What I need actually is a way to feed torque/ current to the regulator and be able to precisely read the feedback. 

My analog circuitry for measuring \$I_a\$ and \$I_b\$ currents works fine, I just don't know how to calculate the needed feedback value.

In other words, can FOC even work for BLDC without an encoder but just with Hall sensors? If not, what is the better way?

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Łukasz Przeniosło
Łukasz Przeniosło
  • 1.7k
  • 1
  • 24
  • 41

FOC for a BLDC motor

I am trying to implement a FOC algorithm in an MCU to use with a BLDC motor. My problem is that I only have the hall sensor feedback, no precise encoder can be used. With this 4 pole pairs motor hall sensors give 15 degree resolution. I think this is the reason my algorithm is failing and I cant get a DC constant d and q values. Is there any better way to drive a BLDC motor than FOC? What I need actually is a way to feed torque/ current to the regulator and be able to precisely read the feedback. My analog circuitry for measuring Ia and Ib currents works fine, I just dont know how to calculate the needed feedback value. In other words- Can FOC even work for BLDC without encoder but just with Hall sensors? If not, what is the better way? I would appreciate all help.