A, micromotor power gauge machine generally uses high precision magnetic blocking power machine, magnetic blocking power machine consists of toothed polar stator, hollow magnetic blocking cup rotor, excited magnetic coil, bracket, bottom plate etc., when the magnetic blocking power machine internal coil passes the current, it generates magnetic force line, and forms a magnetic circuit and generates torque, changing the magnetic stimulus current can change the load force moment.
2, magnetic blocking power machine is suitable for low to medium power motor testing, magnetic blocking power machine does not rely on speed to generate torque, therefore can be carried out from empty load to blocking the whole course test, magnetic blocking power machine cooling method can be divided according to different models: convection air cooling, compressed air cooling, blower cooling, water cooling, air conditioning cooling, according to different motor parameters configure different models of power measuring machine, its accuracy can reach the full scale of ±0.25% -±0.5%.

High precision magnetic blocking power parameter table
Model	Nominal torque	Puwol nominal		Speed ye dɔɔni
HD	N.m.	Puɔ̈ɔ̈r ye cɔl 5 min	Puwol ye kɛ̈n ye kɛ̈n ye kɛ̈n ye kɛ̈n ye kɛ̈n ye kɛ̈n ye kɛ̈n	rpm
HD-301	0.03	80	20	30000
HD-501	0.05	80	20	30000
HD-102	0.1	200	80	25000
HD-202	0.2	200	80	25000
HD-302	0.3	4000	120	25000
HD-502	0.5	400	120	25000
HD-103	1.0	800	375	25000
HD-203	2.0	1000	500	25000
HD-303	3.0	1300	800	25000
HD-503	5.0	1500	1200	25000
HD-603	6.0	2500	1500	25000
HD-144	14.0	2800	1800	12000
HD-284	28.0	5000	2800	10000