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ST-VR74
start-motors
093
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The working method of the Variable Reluctance Resolver:
The iron cores of the stator and rotor are made of soft magnetic alloys of iron and nickel or silicon steel sheets with slots. The rotor is not made of permanent magnetic materials. It is driven to rotate coaxially by the permanent magnetic rotor that drives the synchronous motor. When the rotor rotates, it induces sinusoidal and cosine voltage signals respectively on the two-phase windings on the secondary side through the principle of magnetic resistance. Therefore, it is called the sine winding and the cosine winding, generating electrical angle signals that differ by 90° from each other.
The rotor of the Variable Reluctance Resolver adopts a multi-pole shape. The shape of the magnetic poles should meet the special requirements for sensing sinusoidal signals. Therefore, the magnetic field air gap should be approximately in the shape of a sine wave. By utilizing the changes in the air gap and magnetic resistance, the induced voltage of the output winding will change accordingly as a sine or cosine wave with the mechanical rotation angle. At the same time, the rotor must meet the requirement of multiple magnetic poles. The number of magnetic poles of the stator and rotor of the rotary transformer is different. The number of stator magnetic poles is more than that of the rotor.
The working method of the Variable Reluctance Resolver:
The iron cores of the stator and rotor are made of soft magnetic alloys of iron and nickel or silicon steel sheets with slots. The rotor is not made of permanent magnetic materials. It is driven to rotate coaxially by the permanent magnetic rotor that drives the synchronous motor. When the rotor rotates, it induces sinusoidal and cosine voltage signals respectively on the two-phase windings on the secondary side through the principle of magnetic resistance. Therefore, it is called the sine winding and the cosine winding, generating electrical angle signals that differ by 90° from each other.
The rotor of the Variable Reluctance Resolver adopts a multi-pole shape. The shape of the magnetic poles should meet the special requirements for sensing sinusoidal signals. Therefore, the magnetic field air gap should be approximately in the shape of a sine wave. By utilizing the changes in the air gap and magnetic resistance, the induced voltage of the output winding will change accordingly as a sine or cosine wave with the mechanical rotation angle. At the same time, the rotor must meet the requirement of multiple magnetic poles. The number of magnetic poles of the stator and rotor of the rotary transformer is different. The number of stator magnetic poles is more than that of the rotor.
