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How to distinguish between ordinary motor and variable frequency motor?

How to distinguish between ordinary motor and variable frequency motor?

Generally, the insulation grade of the variable frequency motor is F or higher, which strengthens the insulation to the ground and the insulation strength of the wire turns, especially considering the ability of the insulation to withstand the impact voltage.

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Test run of DC motor

Test run of DC motor

The direct starting method has a large starting current, and the maximum impact current can reach 15 to 20 times the rated value. Therefore, it has a large impact on the power grid and the motor itself. It is usually only used for starting current 6 to 8 times the rated current and power is not greater than 4kW. DC motor. The armature circuit series resistance starting method has a large energy consumption during the starting process and is not suitable for large and medium-sized motors that often start. Decompression starting method and speed regulation method, low energy consumption, smooth starting, used for all kinds of DC motors that need to be started frequently.

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2023

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Protection of DC Motor

Protection of DC Motor

The protection of the DC motor is to ensure the normal operation of the motor, prevent damage to the motor or mechanical equipment, and protect personal safety. Therefore, the protection of the DC motor is an indispensable part of the electrical control system. These protection links include short circuit protection, overvoltage and loss of voltage protection, overload protection, speed limit protection, excitation protection, etc. Some protection links are exactly the same as those of AC asynchronous motors.

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2023

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Causes and inspection methods of spark generated by DC motor

Causes and inspection methods of spark generated by DC motor

Poor contact between brush and commutator. The reasons are as follows: the surface of the commutator is too dirty; The spring pressure is not suitable, and the spring pressure can be adjusted by spring balance or experience. When replacing the brush, other types of brushes were replaced by mistake. The clearance fit between the brush or brush holder is too tight or too loose. If the fit is too tight, emery cloth can be used to grind. If the contact surface is too small or the brush direction is reversed, the contact surface is too small is mainly caused by improper grinding method when replacing the brush.

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Working system of electric motor

Working system of electric motor

The working system of the motor is an explanation of the load condition of the motor. It includes starting, electric braking, no-load, break-energy stop, and the duration and sequence of these stages. The working system of the motor needs to be considered when selecting the rated capacity of the motor. There are S1 ~ S10 motor working system, the following mainly introduces S1 ~ S3.

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2023

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How to Reduce the Damage of Inverter to Motor

How to Reduce the Damage of Inverter to Motor

Install reactors at the output of the inverter: This measure is the most commonly used, but it should be noted that this method has a certain effect on shorter cables (below 30 meters), but sometimes the effect is not ideal.

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2023

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Selection of motor voltage and speed

Selection of motor voltage and speed

The rated speed of the motor is selected according to the requirements of the production machinery. When determining the rated speed of the motor, the transmission ratio of the mechanical deceleration mechanism must be considered. The two cooperate with each other and can be determined through a comprehensive comparison of technology and economy. Generally, the motor speed is not less than 500r/min, because when the power is constant, the lower the motor speed, the larger its size, the more expensive, and the lower the efficiency. If you choose a high-speed motor, it is bound to increase the mechanical deceleration mechanism The transmission ratio of the machine makes the mechanical transmission part complicated.

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2023

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Operating characteristics of three-phase asynchronous motors

Operating characteristics of three-phase asynchronous motors

The working characteristics of three-phase asynchronous motors The working characteristics of asynchronous motors refer to the relationship between the rotation speed N, stator current I1, power factor cosφ1, electromagnetic torque T, efficiency η, etc. of the motor and the output power P2 under the condition of rated voltage and rated frequency operation, I .e. when U1 = UN,f = fN, n, I1, cosφ1, t, n = f(P2). Since the asynchronous motor is an AC motor, it is necessary to consider the power factor for the power grid. At the same time, due to the unilateral excitation, the excitation current and the load current coexist in the stator winding, so the stator current should be paid attention.

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