HAOHUA

Professional Rolling Door Motor Manufacturer

Come & visit us

Fujian, China.

Basic Knowledge of AC Motor

  1. Home
  2. /
  3. Knowledge
  4. /
  5. Basic Knowledge of AC...
Three Phase AC Roller Door Opener Gate Motor

1. Why can't I start the ac motor in a cold environment at will?

The motor is too long in a low temperature environment and will:

(1) Motor insulation cracking;

(2) Bearing grease freezes;

(3) Wire joint solder powder.

Therefore, the motor should be stored in a cold environment and the windings and bearings should be inspected before operation.

2. What are the reasons for the ac motor three-phase current imbalance?

(1) Three-phase voltage imbalance;

(2) The welding of a certain phase branch inside the motor is poor or the contact is not good;

(3) Short circuit between motor windings or short circuit to ground and phase;

(4) Wiring error.

3. Why can't a 60Hz ac motor be connected to a 50Hz power supply?

When designing the motor, the silicon steel sheet is generally operated in the saturation region of the magnetization curve. When the power supply voltage is constant, lowering the frequency will increase the magnetic flux, and the excitation current will increase, resulting in an increase in the motor current, an increase in copper consumption, and eventually an increase in the temperature rise of the motor. In severe cases, the motor may be burnt due to overheating of the coil.

4. What are the reasons for the lack of phase of the ac motor?

Power supply:

(1) Poor contact in the switch;

(2) Transformer or line disconnection;

(3) The fuse is blown.

Motor:

(1) The motor junction box screws are loosely connected;

(2) Poor internal wiring;

(3) The motor winding is broken.

5. What are the reasons for the low insulation resistance of the ac motor?

(1) The winding is damp or has water intrusion;

(2) accumulation of dust or oil on the windings;

(3) Insulation aging;

(4) The insulation of the motor lead or terminal block is broken.

Product Recommendation

wireless-digital-access-keypad08078243125.jpg

Wireless Digital Access Keypad

Place of Origin:Fujian, China (Mainland)
Brand Name:HAOHUA
Model Number:YS501

Read More
industrial-garage-roller-doors-opener53578954847.jpg

Industrial Garage Roller Doors Opener Operators Motors

Quick Details Packaging & Delivery Delmatic GYM50-1 Automatic Automatic Operator With CE, RoHs Product Description Application: GYM-1series industrial door operator can be used for torsion spring balance industrial doors. The operator can be installed by directly drive(shaft drive), also can…

Read More
remote-control-electric-shutter-tubular-motor39348266005.jpg

Remote Control Electric Shutter Tubular Motor

Remote Control Electric Shutter Tubular Motor is suitable for medium and small roller blinds, pleated blinds, honeycomb curtains, electric projection screens, electric washing machines, etc. It can also be used in medium and small aluminum and wood blinds, high precision machinery.

Read More
automatic-gate-rolling-shutter-door-motor53480373313.jpg

Automatic Gate Rolling Shutter Door Motor

Overview Quick Details Packaging & Delivery Packaging Details:Standard exporting carton 1.Door motor individually carton 2.Rack and accessories in another individually carton 3.Durable package with Foam Delivery Time:Shipped in 7 days after payment Product Description Company Information…

Read More