What's the matter with the electromagnetic speed regulating three-phase asynchronous motor speed measuring motor having only two wires?

What's the matter with the electromagnetic speed regulating three-phase asynchronous motor speed measuring motor having only two wires?

The speed measuring motor of the electromagnetic speed regulating three-phase asynchronous motor is usually also an asynchronous motor, but its structure and wiring method are different from those of ordinary three-phase asynchronous motors. The speed measuring motor usually has only two wirings instead of three wirings, because the rotor circuit of the speed measuring motor adopts a transformer rotor circuit.

Specifically, the rotor of the speed measuring motor contains two windings, which are connected to two speed measuring sensors on the stator. When the motor is running, the speed measuring sensor detects the magnetic field signal generated in the rotor winding and converts it into an electrical signal, which then controls the current of the electromagnet through a feedback loop, thereby controlling the speed of the motor.

It should be noted that the installation and commissioning of the speed measuring motor should be carried out in accordance with the relevant operating procedures and requirements to ensure the normal operation of the motor and the accuracy of speed measurement. At the same time, when using the electromagnetic speed regulating three-phase asynchronous motor, the appropriate speed measuring motor and speed measuring method should be selected according to actual needs to achieve stable speed regulation and reliable operation of the motor.

Structure of electromagnetic speed regulating three-phase asynchronous motor

The magnetic speed regulating three-phase asynchronous motor is a motor that achieves speed regulation by changing the rotor circuit resistance. Its structure is similar to that of an ordinary three-phase asynchronous motor, consisting of a stator and a rotor. The stator part includes components such as the stator core, stator winding, and end cover, and the rotor part includes components such as the rotor core, rotor winding, and bearings.

In the electromagnetic speed regulating three-phase asynchronous motor, a variable resistor is installed on the rotor winding. This variable resistor is usually composed of a set of clamping windings and a set of slip rings. By changing the connection position of the clamping winding, the resistance value of the rotor circuit can be changed, thereby realizing the speed regulation function of the motor. The speed regulation accuracy and range of the motor depends on the design and manufacturing process of the clamping winding and slip ring.

In addition to the variable resistor in the rotor circuit, the structure of the electromagnetic speed regulating three-phase asynchronous motor also includes components such as electromagnets, commutators, relays and control circuits. Through the coordination and control of these components, the motor's start and stop, forward and reverse rotation and speed regulation functions can be achieved. It should be noted that during the use and maintenance of the electromagnetic speed regulating three-phase asynchronous motor, the relevant installation, commissioning and maintenance regulations should be strictly followed to ensure the normal operation and service life of the motor.

Why does the electromagnetic speed-controlled three-phase asynchronous motor excitation motor not rotate?

In the electromagnetic speed regulating three-phase asynchronous motor, there may be the following reasons why the excitation motor does not rotate:

Power failure: Check whether the power supply voltage and current are normal, and check whether the fuse and circuit breaker are blown or tripped.

Excitation motor circuit fault: Check whether the excitation motor circuit connection is good, and check whether the slip ring and clamping winding of the excitation motor are normal.

Fault in the excitation motor itself: Check whether the rotor of the excitation motor is blocked, broken or in poor contact, and check whether the bearings of the excitation motor are worn or damaged.

Motor controller failure: Check whether the logic circuit and power circuit of the motor controller are normal, and check whether the trigger signal of the controller is accurate.