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Q&A Calculate values of externally excited DC generator/motor

We use a DC externally excited generator/motor as a generator.We excite the input of the generator and get at the output 10V at 1Wb flux and at 5rps generator speed without connecting the generator...

1 answer · posted 12mo ago by Volpina‭ · last activity 12mo ago by Olin Lathrop‭

Question voltage motor current DC-generator

#3: Post edited by

Volpina‭ · 2023-05-10T22:58:31Z (12 months ago)

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We use a DC externally excited generator/motor as a generator.We excite the input of the generator and get at the output 10V at 1W flux and at 5rps generator speed without connecting the generator to a load.
Now we use the same DC externally excited generated/motor as a motor with 10V input voltage.The 10V voltage source provides 60W of power.The armature resistance is 1Ω.Find the rpm of the motor.
Solution:
Since we havent connected the generator to a load the output voltage Vo will be equal to the voltage produced by the generator Vg = 10V.
![](https://electrical.codidact.com/uploads/l1j26n2kfgkwdxu1xx3k42qw29pq)
The input power of the voltage source is 60W so P= VI->I = P/V = 6A.
The voltage of the motor Vm will be equal to Vin-IarRar = 10-6 = 4V
![](https://electrical.codidact.com/uploads/vkr9j0d8mbssjhqhsdz8n2i2x2zk)
rpm = rps*60 = 180rpm.
Is that correct?

We use a DC externally excited generator/motor as a generator.We excite the input of the generator and get at the output 10V at 1Wb flux and at 5rps generator speed without connecting the generator to a load.
Now we use the same DC externally excited generated/motor as a motor with 10V input voltage.The 10V voltage source provides 60W of power.The armature resistance is 1Ω.Find the rpm of the motor.
Solution:
Since we havent connected the generator to a load the output voltage Vo will be equal to the voltage produced by the generator Vg = 10V.
![](https://electrical.codidact.com/uploads/l1j26n2kfgkwdxu1xx3k42qw29pq)
The input power of the voltage source is 60W so P= VI->I = P/V = 6A.
The voltage of the motor Vm will be equal to Vin-IarRar = 10-6 = 4V
![](https://electrical.codidact.com/uploads/vkr9j0d8mbssjhqhsdz8n2i2x2zk)
rpm = rps*60 = 180rpm.
Is that correct?

#2: Post edited by

Volpina‭ · 2023-05-10T18:47:56Z (12 months ago)

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We use a DC externally excited generator/motor as a generator.We excite the input of the generator and get at the output 10V at 1W flux and at 5rps generator speed without connecting the generator to a load.
Now we use the same DC externally excited generated/motor as a motor with 10V input voltage.The 10V voltage source provides 60W of power.The armature resistance is 1Ω.Find the rpm of the motor.
Solution:
Since we havent connected the generator to a load the output voltage Vo will be equal to the voltage produced by the generator Vg = 10V.
~~![](https://electrical.codidact.com/uploads/80qhtw8bvfir8h0y1eh1qtd147qu)~~
The input power of the voltage source is 60W so P= VI->I = P/V = 6A.
The voltage of the motor Vm will be equal to Vin-IarRar = 10-6 = 4V
![](https://electrical.codidact.com/uploads/vkr9j0d8mbssjhqhsdz8n2i2x2zk)
rpm = rps*60 = 180rpm.
Is that correct?

We use a DC externally excited generator/motor as a generator.We excite the input of the generator and get at the output 10V at 1W flux and at 5rps generator speed without connecting the generator to a load.
Now we use the same DC externally excited generated/motor as a motor with 10V input voltage.The 10V voltage source provides 60W of power.The armature resistance is 1Ω.Find the rpm of the motor.
Solution:
Since we havent connected the generator to a load the output voltage Vo will be equal to the voltage produced by the generator Vg = 10V.
![](https://electrical.codidact.com/uploads/l1j26n2kfgkwdxu1xx3k42qw29pq)
The input power of the voltage source is 60W so P= VI->I = P/V = 6A.
The voltage of the motor Vm will be equal to Vin-IarRar = 10-6 = 4V
![](https://electrical.codidact.com/uploads/vkr9j0d8mbssjhqhsdz8n2i2x2zk)
rpm = rps*60 = 180rpm.
Is that correct?

#1: Initial revision by

Volpina‭ · 2023-05-10T15:49:15Z (12 months ago)

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Calculate values of externally excited DC generator/motor

We use a DC externally excited generator/motor as a generator.We excite the input of the generator and get at the output 10V at 1W flux and at 5rps generator speed without connecting the generator to a load.

Now we use the same DC externally excited generated/motor as a motor with 10V input voltage.The 10V voltage source provides 60W of power.The armature resistance is 1Ω.Find the rpm of the motor.

Solution:

Since we havent connected the generator to a load the output voltage Vo will be equal to the voltage produced by the generator Vg = 10V.

![](https://electrical.codidact.com/uploads/80qhtw8bvfir8h0y1eh1qtd147qu)

The input power of the voltage source is 60W so  P= VI->I = P/V = 6A.

The voltage of the motor Vm will be equal to Vin-IarRar = 10-6 = 4V

![](https://electrical.codidact.com/uploads/vkr9j0d8mbssjhqhsdz8n2i2x2zk)

rpm = rps*60 = 180rpm.

Is that correct?

voltage motor current DC-generator

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