(3) norms choice

Often the product standards as a result of actual production is not much, give it is difficult to choose a product to increase. Can consider when choosing product standards: In the circumstance with power source adjustable voltage, can choose the norms with the adjacent rating with torsion, rotate speed and corresponding product by real need, get what wanting rotate speed through changing voltage; In the circumstance that power source voltage secures, when if do not have the product of proper norms to be able to be offerred,be being chosen, can choose proper norms by torsion first, and can make between the voltage of the product and rotate speed adjust appropriately.

2, motive of permanent magnetism dc should notice when application:

(1) if the product does not have special specification, usually (for example motive of dc of aluminous nickel cobaltic permanent magnetism or motive of dc of ferrite permanent magnetism) motive of permanent magnetism dc does not allow to fall to receive apply the brake to move instead in rated voltage, can cause permanent magnet demagnetization otherwise; When if be necessary to make this kind of way truly,moving, want to add current limliting resistance, pass in order to restrict electric current big.

(2) undertake to electric machinery stand or fall by the following measure the abecedarian checks:

Check the exterior of electric machinery above all: Should not have nick, touch injury and besmear film to fall off; Turn next runner shaft, should turn neatly, without apparent get stuck phenomenon. The wiring that checks electromotor is firm, and electrify moves. Nonexistent attrition answers in the process that electromotor is rotating, among them the most outstanding is bearing attrition. The meeting after bearing wears away gives out abnormal sound, appear phenomenon of local overheat temperature rise.

(3) change when brush, should clear the electric charcoal dust all round, clean commutator with alcohol, benzine, change when using new brush, want to notice to undertake carrying for nothing adjusting first.

(4) because electric current crosses change of big, temperature to reach,notice electromotor tear open open a way of the magnetic circuit when outfit and the permanent magnet demagnetization that cause, especially electromotor of cobaltic to aluminous nickel permanent magnetism, tear open should undertake to permanent magnetism magnetic circuit magnetism short circuit is protected when outfit, magnetism should be filled additionally after demagnetization otherwise.