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A commutation interval occurs when the current in one coil must be reversed. (See Figure 8 In the simplest form this involves a brush bridging between two commutator segments, shorting out that coil. The resistance of the brush causes the current to decay. When the brush leaves the leading segment the current in the leading coil must reverse.
- Permanent Magnets in Electric Machines
Of all changes in materials technology over the last several...
- Permanent Magnets in Electric Machines
A commutation interval occurs when the current in one coil must be reversed. (See Figure 8 In the simplest form this involves a brush bridging between two commutator segments, shorting out that coil. The resistance of the brush causes the current to decay. When the brush leaves the leading segment the current in the leading coil must reverse.
Commutation in DC Generator. The voltage induced in a single coil of a DC generator is alternating. A commutator is therefore necessary to ensure that the current in the external circuit always flows in the one direction. During the brief interval when a coil is short-circuited by a brush, the current in the coil must reverse its direction.
Commutation requires knowledge of rotor position with regard to the magnetic poles of the motor. For resolvers, which normally provide an absolute position within one revolution of the motor, this problem is most often solved by mechanically aligning the resolver to the magnetic poles of the motor.
Mar 29, 2018 · The commutation interval is calculated for different possible cases of commutation using motor parameters and the operating conditions. The overlap angle in terms of commutation time is also justified through a simulation study which gives an empirical relation of with the operating point, i.e. speed and load torque.
- Chetan K. Lad, Rajagopalan Chudamani
- 29 March 2018
- 23
- 12, Issue6
AC-side reactance in rectifer circuits introduces a commutation interval during which multiple de-vices are on so current can switch between them. This period is u long. For HW rectifer . . . cos u = 1 X: C. I. d. V. S. 2. The commutation period causes the output voltage to be held low during commutation. The longer the commutation, the lower ...
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Commutation in DC Machine. The currents induced in the armature conductors of a DC generator are alternating in nature. The change from a generated alternating current to the direct current applied involves the process of Commutation. When the conductors of the armature are under the north pole, the current which is induced flows in one direction.
