Knowledge about motor and electrical control technology
10, star connection
Three windings, one end connected to one phase of the three-phase voltage and the other end connected together.
11, delta connection
The three windings are connected end to end, and three phases are respectively connected to the three terminals.
12, decompression start
When the motor capacity is large, the power supply voltage is lowered into the stator winding of the motor to start the motor.
13, the main circuit
The main circuit is a circuit from the power source to the end of the motor or line, and is a circuit through which a strong current passes.
14, auxiliary circuit
The auxiliary circuit is a small current through the circuit.
15, speed relay
A non-electrical signal detecting device with a rotational speed as an input, which can output a switching signal when the measured rotational speed rises or falls to a predetermined set value.
16, relay
A relay is a control element that converts a quantity of electricity or a non-electrical quantity into an electromagnetic force (with a contact type) or a step change in the output state (no contact type) by using various physical quantities.
17, thermal relay
It is a protective device that works by the principle of the thermal effect of current.
18, AC relay
A relay that draws coil current to AC.
19, full pressure start
When the motor capacity is small, the stator winding of the motor is directly connected to the power source and started at the rated voltage.
20, voltage
The potential difference across the circuit.
21, the contact
The contact, also known as the contact, is an actuator of an electromagnetic appliance that functions as a switch-on and break-off circuit.
22, electromagnetic structure
The electromagnetic mechanism is a sensing component of an electromagnetic appliance that converts electromagnetic energy into mechanical energy, thereby driving the contact action.
23, the arc
The arc is actually a discharge phenomenon caused by a gas between the contacts under the action of a strong electric field.
24, contactor
The contactor is an automatic control switchgear suitable for long-distance control, frequent operation of AC and DC main circuits and large-capacity control circuits in low-voltage power distribution systems.
25, temperature relay
A protective device that operates by indirectly reflecting the temperature of the winding by the overheating element is called a temperature relay.
26, jog circuit
When the jog button is pressed, the coil is energized and pulled, the main contact is closed, the motor is connected to the three-phase AC power supply, and the rotation is started; when the button is released, the coil is discharged, the main contact is disconnected, and the motor is powered off and stopped.
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